We Tested Every Free Business Valuation Calculator. Most of Them Are Dangerous.
We entered the same business into every free valuation calculator online. The results ranged from 960,000 to 4.8 million. Here is what each tool gets wrong and what to use instead.
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If you are thinking about selling your business in the next one to five years, the number you see on a free valuation calculator could cost you hundreds of thousands of pounds. Here is why, and what to use instead.
There are now dozens of free business valuation calculators online. Type "how much is my business worth" into Google and you will find tools from insurance comparison sites, funding platforms, startup accelerators, and M&A marketplaces, all promising an answer in sixty seconds to five minutes.
We tested them all. We entered the same fictional company into each one: a fire safety business turning over £3.2 million with £480,000 of pre-tax profit, 14 employees, 85 per cent recurring revenue from maintenance contracts, three accreditations, and a management team that could run the business without the owner for six months.
The results ranged from £960,000 to £4.8 million. That is a five-times spread on the same business. And the most alarming part is not the range itself. It is that none of the tools told the owner why the number was what it was, or what they could do to move it.
The Problem With "60-Second" Valuations
A business valuation is not a mortgage calculation. It is not a formula you can solve with three inputs. As Investopedia's guide to business valuation explains, the value of a company depends on who is buying it, why they want it, what they plan to do with it after completion, and how much competition they face from other buyers at the table.
A fire safety company with £480,000 of profit and 85 per cent recurring revenue from blue-chip maintenance contracts is worth materially more than a fire safety company with the same profit generated entirely from one-off installation projects for a single housing association. The first business has predictable cash flows, low customer concentration, and genuine barriers to switching. The second has project risk, single-client dependency, and no contractual protection. A buyer's due diligence team will price these two businesses completely differently.
No calculator that asks four questions can distinguish between them. For a deeper look at the factors that actually move the multiple, see our guide to the 30 things that determine what a buyer will pay.
What We Found: Tool by Tool
CalcXML and MoneySuperMarket: The Spreadsheet Era
CalcXML's business valuation calculator asks for your EBITDA, a risk level (low, medium, or high), excess owner compensation, and whether to apply a small-company discount. It then runs a basic discounted cash flow calculation and gives you a single number.
This is the equivalent of valuing a house by knowing only the number of bedrooms. It ignores location, condition, planning permission, the state of the roof, and whether the neighbours are building an extension. For a business, it ignores your customer contracts, your team, your systems, your accreditations, your growth trajectory, and the competitive landscape of buyers in your sector.
MoneySuperMarket's calculator is even simpler. It asks for net profit history and the value of your assets and liabilities, then produces what it calls a "ballpark estimate." The site itself is an insurance comparison platform. It has no M&A expertise, no sector knowledge, and no buyer relationships. The calculator exists to sell business insurance, not to advise on exits.
Axial: The 60-Second Promise
Axial's calculator promises a valuation in sixty seconds using "industry-specific DCF methodology trusted by leading M&A advisors." It asks for revenue, net profit, industry classification, and growth rates, then produces three scenarios: conservative, realistic, and optimistic.
The methodology section is more transparent than most. It acknowledges that profitability comparison, customer dependence, and regulatory environment matter. But it cannot assess any of these factors in sixty seconds with five inputs. The tool explicitly states: "it's essential to consult with a professional valuation expert for a precise assessment." In other words, even Axial admits their own calculator is not sufficient.
The real purpose of the tool is lead generation for Axial's M&A advisor marketplace. The valuation is the hook. The product is the advisor introduction.
Equidam: Sophisticated, But Built for the Wrong Transaction
Equidam is the most methodologically rigorous tool we tested. It uses five valuation methods (Scorecard, Checklist, DCF with Long-Term Growth, DCF with Multiple, and the Venture Capital Method), weights them, and produces a report that is IPEV-compliant. It has valued 160,000 companies across 90 countries since 2013.
The problem is that Equidam is explicitly designed for funding rounds, not acquisitions. The Venture Capital Method calculates value based on the returns an investor expects to earn upon exit. The Scorecard and Checklist methods are "business angel frameworks" designed for pre-revenue startups. The entire platform is built around the question: "What should my pre-money valuation be for my next funding round?"
This is a fundamentally different question from: "What would a trade buyer or private equity firm pay to acquire 100 per cent of my company?" We explain this distinction in detail in our article on why your business valuation is wrong.
A funding round valuation reflects what a minority investor will pay for a percentage of future upside. An acquisition valuation reflects what a buyer will pay for the entire business, its cash flows, its team, its contracts, and its strategic position. The methodologies are different. The multiples are different. The negotiation dynamics are different. And conflating the two gives business owners a dangerously distorted view of what their company is actually worth in a sale.
Equidam's pricing page confirms this: "$5 billion in funding secured" by companies using their reports. That is their market. If you are a £3 million revenue fire safety company with no intention of raising venture capital, Equidam's methodology does not apply to you.
SourceCo: Closer, But Still Too Shallow
SourceCo's valuation calculator is the closest competitor to what a genuine acquisition-focused valuation tool should look like. It claims to use "22+ buyer-verified valuation factors," considers customer concentration, owner dependency, and team structure, and produces an "Exit Readiness Score" alongside a valuation range.
The problem is that it asks approximately six questions and promises results in three minutes. You cannot meaningfully assess 22 factors with six inputs. The rest must be assumed, and assumptions in a valuation are where value is lost.
SourceCo is also US-focused (all figures in USD, no UK-specific considerations), has no sector-specific methodology (the same tool for SaaS, construction, retail, and manufacturing), and does not perform any financial analysis beyond headline EBITDA. There is no add-back analysis, no earnings quality assessment, and no consideration of accreditations, compliance history, or regulatory position.
For a UK building services or healthcare business, these omissions are critical. A fire safety company's BAFE accreditation, its LPCB-listed products, and its FIA membership are genuine barriers to entry that buyers pay a premium for. A dental practice's CQC rating, its NHS contract allocation, and its associate-to-principal ratio are the factors that determine whether it trades at 5x or 9x EBITDA. No generic calculator captures these. For sector-specific multiple ranges, see our fire safety multiples guide, HVAC multiples guide, or electrical contracting multiples guide.
ValueMyBusiness and Swoop: Lead Generation in Disguise
ValueMyBusiness.co.uk is a UK-focused tool that promises a report including "Buyer Appetite," "Company Worth," and "Saleability" in under five minutes. Swoop's "Online Business Valuation Checker" is specifically for digital businesses (SaaS, apps, eCommerce, blogs) and appears to embed a third-party marketplace widget.
Both are lead generation tools. They collect your contact details and financial information, produce a superficial output, and then connect you with their network of brokers or buyers. The valuation is not the product. You are the product.
Why This Matters: The Real Cost of a Wrong Number
A business owner who believes their company is worth £1.5 million when it could achieve £2.8 million with six months of preparation will either sell too cheaply or not sell at all. Both outcomes are expensive. Research from the Exit Planning Institute suggests that up to 80 per cent of businesses listed for sale never complete a transaction, often because of misaligned price expectations.
The owner who sells too cheaply leaves hundreds of thousands of pounds on the table because they accepted the first offer that matched their (incorrect) expectation. The owner who does not sell at all often does so because they compared a generic calculator output to an unsolicited approach and concluded the buyer was "lowballing" them, when in reality the buyer's offer was fair but the calculator was wrong.
The most dangerous scenario is the owner who uses a funding-round calculator like Equidam, sees a number inflated by venture capital methodology, and then rejects every genuine acquisition offer because none of them match the "valuation" they were given. This happens more often than the M&A industry admits.
What a Genuine Acquisition Valuation Actually Requires
When a corporate finance team values a business for sale, they assess at minimum:
Financial quality. Not just the headline profit, but the quality of those earnings. Are they recurring or one-off? Are they growing or declining? What are the legitimate add-backs? What is the adjusted EBITDA after stripping out owner benefits, one-off costs, and related-party transactions?
Revenue durability. What percentage is contracted? What is the average contract length? What is the renewal rate? What would happen if a competitor offered your three largest customers a 10 per cent discount?
Customer concentration. If your top three customers represent 60 per cent of revenue, that is a risk a buyer will price into the multiple. If no single customer exceeds 5 per cent, that is a premium.
Key-person dependency. Can the business operate without the owner for three months? Six months? Indefinitely? The answer to this question alone can swing a valuation by 30 per cent. Our article on key-person dependency explores this in detail.
Operational systems. Are processes documented? Is there a CRM? Are jobs tracked digitally? Can a buyer's integration team understand how the business operates within a week of completion?
Team depth. Is there a management layer below the owner? Are there employment contracts? Non-competes? A succession plan?
Accreditations and compliance. In regulated sectors (fire safety, healthcare, electrical), accreditations are genuine barriers to entry. A buyer who acquires your BAFE SP203 certification, your Gas Safe registration, or your CQC outstanding rating is buying something that would take them two to three years to build organically.
Market position and growth. Where does the business sit in its local market? Is the sector consolidating? Are there identifiable acquirers actively buying in this niche? The BDO Private Company Price Index tracks UK mid-market deal multiples quarterly.
Deal structure. What is the likely split between cash at completion, deferred consideration, and earn-out? A £3 million headline with £1 million deferred over three years is not the same as £2.5 million in cash on day one.
No tool that asks four questions and promises an answer in sixty seconds can assess any of these factors. And yet these are exactly the factors that determine whether your business trades at 3x or 7x adjusted EBITDA. For a full breakdown, read the 30 factors that determine your multiple.
What We Built Instead
DealFlowAgent's valuation calculator was designed by M&A advisors who have completed 22 acquisitions and assessed hundreds more. It asks 51 questions across finance, commercial performance, operations, team, growth, and owner position. It routes to 85 sector-specific sub-niches, each with tailored multiple bands derived from completed transactions. It integrates with Companies House to verify your legal entity and filing history automatically.
The output is not a single number. It is a 10 to 12 page report that shows the earnings build line by line, the multiple applied, the 30 factors that pushed it up or down, and three timing scenarios: what the business is worth if you sell now, what it would be worth in twelve months with no changes, and what it could be worth in twelve months with targeted preparation.
It takes approximately 15 minutes of the owner's time. It is completely free. And it is backed by an AI advisor called Richard who can answer questions, clarify terminology, and go deeper on any area where the owner wants more detail.
We also recommend a 25 to 30 minute call with our team after the report is generated. Not because the report is incomplete, but because the conversation surfaces context that no form can capture: the owner's personal timeline, their emotional readiness, their family situation, their relationship with their management team, and the one thing about their business that they have never told anyone but that a buyer would pay a premium for.
For a detailed comparison of what our free report produces versus a formal chartered accountant valuation, see our article on the 15-minute valuation vs the £15,000 valuation.
Get your valuation report here — 15 minutes, completely free, strictly confidential.
The Bottom Line
Free valuation calculators are not all created equal. Most of them exist to generate leads, not to give you an accurate answer. The ones that are methodologically rigorous (like Equidam) are designed for funding rounds, not acquisitions. The ones that are designed for acquisitions (like SourceCo) are too shallow to capture the factors that actually determine what a buyer will pay.
If you are a business owner with £1 million to £30 million of revenue, operating in building services, healthcare, professional services, or any essential services sector, and you are thinking about selling in the next one to five years, you deserve better than a sixty-second guess.
You deserve a valuation that a chartered accountant could scrutinise, that a buyer's due diligence team would recognise, and that you could use to make a genuinely informed decision about the most significant financial event of your life. You can also score your exit readiness across the twelve factors acquirers actually underwrite.
DealFlowAgent is a specialist M&A advisory firm for owner-led businesses in building services, facilities management, healthcare, and professional services. We help owners understand what their business is worth, prepare it for sale, and run a competitive process that maximises value. Book a confidential call or start your free valuation.
Experienced Dealmakers Lead Your Exit
A senior M&A bench, plus a sector specialist recruited for your industry on every deal.
Head of M&A
Joining 22 August 2026, name announcing soon
Joining full-time on 22 August 2026 from the largest M&A advisory firm in the UK, owned by K3 Capital. As an ex-Director he managed teams of M&A advisors, analysts and associates, working daily with business owners, buyers and stakeholders on live acquisition deals. Selected from 260 applicants alongside colleagues from investment banking backgrounds, he brings that experience and network to lead the advisory bench across Building Services, Facilities Management, and Healthcare.
Joining full-time on 22 August 2026 from the largest M&A advisory firm in the UK, owned by K3 Capital. As an ex-Director he managed teams of M&A advisors, analysts and associates, working daily with business owners, buyers and stakeholders on live acquisition deals. Selected from 260 applicants alongside colleagues from investment banking backgrounds, he brings that experience and network to lead the advisory bench across Building Services, Facilities Management, and Healthcare.
Martin is one of the most well-connected figures in UK fire, security, building services and FM. He is Chairman of both the Fire Industry Association and the British Security Industry Association, the only person in the UK to hold both roles simultaneously. Martin spent over a decade in senior leadership at Mitie, latterly as Industry Liaison Director for its fire and security division, helping scale the business past £500m in revenue and playing a role in the £366m acquisition of Marlowe plc, which created one of the UK's largest compliance, fire and security services groups. He joined DealFlowAgent because owners in these sectors deserve a genuine sector-specialist advisor across valuation, business optimisation and buyer access. In recognition of his industry roles, he acts in a personal, non-partisan capacity.
Martin is one of the most well-connected figures in UK fire, security, building services and FM. He is Chairman of both the Fire Industry Association and the British Security Industry Association, the only person in the UK to hold both roles simultaneously. Martin spent over a decade in senior leadership at Mitie, latterly as Industry Liaison Director for its fire and security division, helping scale the business past £500m in revenue and playing a role in the £366m acquisition of Marlowe plc, which created one of the UK's largest compliance, fire and security services groups. He joined DealFlowAgent because owners in these sectors deserve a genuine sector-specialist advisor across valuation, business optimisation and buyer access. In recognition of his industry roles, he acts in a personal, non-partisan capacity.
Nick leads FM Talent Partners, the facilities management and real estate leadership search firm, and is a leading specialist in building services and FM management talent. He partners with DealFlowAgent on two-way referrals: helping business owners and acquirers fill the key roles that decide whether a business is sellable, and introducing owners who are thinking about their next chapter to a team that knows their industry and their market. Key-person dependency is one of the two most common reasons a sale collapses, and Nick fixes it at source.
Nick leads FM Talent Partners, the facilities management and real estate leadership search firm, and is a leading specialist in building services and FM management talent. He partners with DealFlowAgent on two-way referrals: helping business owners and acquirers fill the key roles that decide whether a business is sellable, and introducing owners who are thinking about their next chapter to a team that knows their industry and their market. Key-person dependency is one of the two most common reasons a sale collapses, and Nick fixes it at source.
James Duboullay
Senior M&A Advisor
- •25+ years across investment banking, M&A and fundraising
- •Sector focus: essential services and software
- •Long-standing relationships with private equity buyers and growth funds
- •Personally advising DealFlowAgent founders for the past four years
- •25+ years across investment banking, M&A and fundraising
- •Sector focus: essential services and software
- •Long-standing relationships with private equity buyers and growth funds
- •Personally advising DealFlowAgent founders for the past four years
Emerson Patton
Sector Specialist: Building Services & Facilities Management
- •20+ years advising owners in building services, fire safety, HVAC, plumbing, and construction
- •Guided 200+ companies through growth, profit improvement, and exit planning
- •Builds equity value and operational structure long before a sale
- •Partners with DFA to prepare owners for exit while the advisory team runs the sale
- •20+ years advising owners in building services, fire safety, HVAC, plumbing, and construction
- •Guided 200+ companies through growth, profit improvement, and exit planning
- •Builds equity value and operational structure long before a sale
- •Partners with DFA to prepare owners for exit while the advisory team runs the sale
Kaya Kesici
M&A Advisor, Fire Safety, Security & Compliance
- •17 completed M&A transactions over the past six years across UK SME fire safety, security and compliance-led services
- •Sell-side and buy-side experience, buyer research, acquirer mapping, outreach and live process coordination
- •Information request lists, databook prep, IC-style summaries and EV-to-equity bridge work
- •Direct sector exposure across fire protection, security systems, CCTV, access control and intruder alarms
- •17 completed M&A transactions over the past six years across UK SME fire safety, security and compliance-led services
- •Sell-side and buy-side experience, buyer research, acquirer mapping, outreach and live process coordination
- •Information request lists, databook prep, IC-style summaries and EV-to-equity bridge work
- •Direct sector exposure across fire protection, security systems, CCTV, access control and intruder alarms
Previously
Ranger Fire & Security · Complete Building Services · Compliance Group
- •22 completed M&A transactions
- •Direct relationships with hundreds of strategic and financial acquirers
- •Previously built a mobility and field services business to 30 staff and 6 UK warehouses, then sold via competitive process with an EY M&A partner
- •Raised £2m in funding; placed 3rd of 1,900 at OnStage (the "Y Combinator of Europe")
- •Full-stack developer of advanced agent systems and second-brain tooling for the M&A process
- •22 completed M&A transactions
- •Direct relationships with hundreds of strategic and financial acquirers
- •Previously built a mobility and field services business to 30 staff and 6 UK warehouses, then sold via competitive process with an EY M&A partner
- •Raised £2m in funding; placed 3rd of 1,900 at OnStage (the "Y Combinator of Europe")
- •Full-stack developer of advanced agent systems and second-brain tooling for the M&A process
Sector Expert
Industry-Specific Advisor
For every engagement we add a sector specialist from your industry to the core team: a 15–25 year operator or advisor with direct relationships in your niche. Recruited per deal so you get the right fit, not a generalist.
For every engagement we add a sector specialist from your industry to the core team: a 15–25 year operator or advisor with direct relationships in your niche. Recruited per deal so you get the right fit, not a generalist.
The bench is growing. Two senior M&A hires confirmed for late July 2026, selected from 200+ applicants out of Goldman Sachs, Deutsche Bank, EY, KPMG and leading boutique M&A firms. See open roles →
The AI layer behind every advisor
Two in-house AI systems work alongside the human bench. They are software, not people, built and supervised by the advisory team.
Sage
AI Deal Concierge
Available 24/7. Monitors every signal in your deal and keeps the advisory team one step ahead. Trained on thousands of M&A transactions.
Sterling
Buy-Side Deal Origination Agent
Engages 13,000+ acquirers to surface live mandates and intent, then feeds your advisors with warm, ranked buyer matches.
The Exit Readiness Scorecard
Score your business across the factors acquirers underwrite, including key-person dependency, contract quality, customer concentration and earnings quality. Complete it below, print it, or download the PDF and work through it with your leadership team.
Watch the intro from our founder, Joe
Two minutes on how DealFlowAgent runs a confidential, competitive sale process for owners of building services, facilities management and healthcare businesses.
Joe Lewin
Exited entrepreneur and M&A advisor who has guided 20+ business owners through successful exits. Joe built and sold his first company after scaling to 80,000+ users and raised over £2M in funding. He founded DealflowAgent to combine traditional M&A expertise with AI technology, creating aligned advisory solutions for SME business owners. Joe regularly speaks on exit planning and M&A trends, and has built a network of thousands of strategic acquirers across UK and US markets.
What is your business actually worth?
Sector by sector benchmarks built from real completed transactions, with the valuation bands acquirers underwrite against.
- Fire Safety Business Valuation & EBITDA MultiplesWhat fire alarm, extinguisher, sprinkler and passive fire protection businesses sell for, band by band.
- Security Systems Business Valuation & EBITDA MultiplesCCTV, access control, intruder alarms and monitoring: the multiples acquirers are paying in 2026.
- Compliance, Testing & Inspection Valuation GuideWhy recurring statutory inspection revenue attracts the highest multiples in building services.
- Electrical Contracting Valuation & EBITDA MultiplesNICEIC, EICR and EV infrastructure: how electrical contractors are valued and sold.
- HVAC, Refrigeration & Cooling Valuation GuideService contract density, engineer retention and the multiples HVAC consolidators pay.
