Sales Conversion Rate Calculator
- No invented stats
- Written for UK readers
- Published 10 October 2026
An overall conversion rate tells you how you are doing. Stage-to-stage rates tell you where the problem is. Enter the counts for up to four stages of your funnel and this calculator gives you both, so you can see which step is losing the most and fix that one rather than throwing more leads at the top. It runs entirely in your browser — nothing you enter is sent anywhere.
How this works
A conversion rate is just one number divided by the number before it: how many came out of a stage divided by how many went in, as a percentage. The calculator does that for each pair of stages you fill in, and then divides the final stage by the first for the overall rate.
Stage names are there so the output reads like your funnel rather than "stage 2". You only need two stages to get an answer; leave any you do not track blank and the calculator will chain the ones you have filled in.
Two things to get right before you trust the numbers. First, count the same cohort: if you count leads that arrived in January, count the sales that came from those leads, not the sales you closed in January from older leads. With a long sales cycle those are very different figures. Second, be consistent about what counts as entering a stage — "sent a proposal" has to mean the same thing every time, or the rate measures your data entry rather than your selling.
A worked example
A team looks at one quarter's funnel: 500 leads, 120 discovery calls, 45 proposals, 18 closed won.
- Leads to discovery calls: 120 ÷ 500 = 24.0%
- Discovery calls to proposals: 45 ÷ 120 = 37.5%
- Proposals to closed won: 18 ÷ 45 = 40.0%
- Overall: 18 ÷ 500 = 3.6%, which is one sale for every 27.8 leads
Read it as a chain and the biggest leak is obvious: three quarters of the leads never make it to a first conversation. Lifting that first step from 24% to 30% — with no improvement anywhere else — would take the quarter from 18 sales to about 22. Lifting the close rate from 40% to 45%, which sounds like the more impressive win, only gets you to 20. The earliest weak stage is usually where the cheapest gains are.
It also tells you what a target costs. If you need 25 sales next quarter at these rates, you need 25 ÷ 0.036 = about 695 leads, or better rates in the middle.
What this doesn't account for
- Deal size. A stage that converts badly but produces your biggest deals may still be the best thing you do. Rates ignore value entirely.
- Timing. Deals still in the pipeline are neither won nor lost, so a snapshot of a live quarter will understate the true rate.
- Small numbers. With a handful of deals, one extra win swings the percentage wildly. Treat short-period rates as a hint, not a measurement.
- Lead quality. Conversion rates move when the mix of sources moves, so a falling rate can mean more leads rather than worse selling.
If your stages are fuzzy, fix that first — sales pipeline stages explained covers how to define stages so the counts mean something, and sales KPIs that actually matter puts conversion in context with the rest of your numbers. To turn these rates into a revenue forecast, try the sales velocity calculator.
Spotted a mistake or a number we can't back up? Tell us and we'll fix it.