In this piece · 5 sections
What free valuators actually measure
If you have ever pasted the same URL into three different free website valuators, you have probably seen three different numbers. Often the spread is wide enough that the figures look unrelated. They are unrelated — because the tools are not measuring the same thing.
Most free valuators do one of three things, in increasing order of intellectual laziness:
- Revenue × multiple. Take trailing twelve-month revenue, multiply by some industry figure between 2 and 4. Ignores cost structure entirely. A site doing $100k in revenue at 70% margin is not worth the same as one doing $100k at 22%. See the actual 2026 multiples.
- Traffic × constant. Multiply monthly visitors by a fixed dollar value. Treats a session from a returning newsletter subscriber as identical to a session from a deindexed Pinterest pin.
- Pageview × outdated RPM. Apply ad-network rates that have not been true since 2019. Useful for inflating numbers on a sales screen.
Why the spread is so wide
Two valuators using the same inputs and the same formula would produce the same number. The reason free valuators disagree is that they are using different formulas on different inputs and presenting the results with the same level of confidence — a single dollar figure, often with two decimal places.
A model that cannot distinguish a healthy site from a dying one does not try. It assigns them the same value. So the question is not which free valuator to trust. The question is what an estimate of website value owes you in the first place.
What an honest model owes you
There is no single industry-standard formula for website valuation. There is, however, a reasonable consensus among working brokers about which inputs matter and how to combine them. Any tool that claims to give you a credible estimate should at minimum do four things.
Worth flagging between the visuals: the underlying data is the same — the second view stacks the same facts in a different shape so the spread reads at a glance.
Reading a confidence band
If you take only one thing from this piece, take this: the width of the band is the signal. A narrow band means the model has high confidence, usually because the site is in a well-trodden niche with comparable recent sales. A wide band means the model is honest about not knowing yet.
A valuator that returns the same band width regardless of input is not modeling confidence. It is defaulting.
Where this leaves you
If you are using a free valuator to figure out a rough order of magnitude — should I be thinking $50k or $500k? — most of them are fine for that, and you can stop here.
If you are using one to set a listing price, plan a sale, or model an exit, you need an output that does SDE-based math, observes traffic quality, returns a band, and tells you which levers move the number. Most do not. RealSiteWorth does — see the methodology and a sample report. The website valuation pillar guide is the umbrella reference.
- Empire Flippers — public marketplace dataempireflippers.com
- Quiet Light Brokerage — buyer demand indexquietlight.com
- Flippa — annual valuation reportflippa.com
- Centurica — diligence checklistcenturica.com
