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Lead Conversion Calculator

Lead-to-customer rate is customers divided by leads. It shows the leak between the form and the sale. Cheap leads with a 2% close are not cheap.

The tool

Try it here

Use this when CRM has a lead count and a customer count for the same offer and period. Do not mix MQLs (marketing-qualified leads) and sales-accepted leads without a label.

The leak between form and sale

Lead conversion

Why it helps

Why you need a Lead Conversion Calculator

A lead is not a customer. If 100 demos become 10 customers, ads-only cost per customer is 10× CPA.

Sales cycle time matters. Use a cohort: leads from March, customers from those leads, not “customers this month.”

If the form is a newsletter, do not call it a sales lead in this math.

THE LEAK IS A STEP, NOT “THE FUNNEL”THE LEAK IS A STEP, NOT “THE FUNNEL”Landing4,000Lead120Customer18Fix the biggest drop first. Decorating a later step will not help.Counts must be the same people, same window.
Drop-off % is 1 − (next ÷ current). Write the step names in the sheet.

When

When to use it

  • When CPA is celebrated and sales says the pipeline is junk.
  • When you are setting a lead value for bidding.
  • When two channels have similar CPA and very different close rates.

How

How to use it

  1. 1Enter customers and leads from the same cohort.
  2. 2Rate = customers ÷ leads.
  3. 3Optional: multiply by average customer value for a rough lead value.
  4. 4Put the rate next to CPA and CAC in the weekly review. Do not hide it.

Example

Example: demos to customers, 2026q3

google-in-demo-exact-2026q3. 100 demo bookings in the window. 20 became paying customers by the review date. Write the lag rule down.

You put in

Leads
100 demo booked
Customers
20
CPA
₹2,000 per demo

You get

Lead-to-customer = 20 / 100 = 20%
Ads-only cost per customer ≈ 2000 / 0.20 = ₹10,000

₹2,000 CPA was the demo. ₹10,000 is ads-only per customer - still not full CAC if you add people and tools. If close rate were 5%, the same CPA would be a ₹40,000 customer cost from ads alone.

Result

What this changes for you

CPA can look fine while CAC (customer acquisition cost) is ugly. This rate explains the gap.

Common mistakes

  • Dividing this month’s customers by this month’s leads when the cycle is 60 days.
  • Counting every form fill as a sales lead.
  • Blending inbound and a bought list in one rate.
  • Calling this CAC. CAC divides spend by customers, often with more costs.

FAQ

Lead Conversion Calculator FAQ

How does a lead conversion calculator work?

Lead-to-customer rate = customers ÷ leads. 20 / 100 = 20%. Use a cohort, not mixed months, if the sales cycle is long.

Why use a lead conversion calculator if I already have CPA?

CPA is cost per the tracked action, often a lead. This rate tells you how many leads become customers. Cheap CPA with a 2% close is not cheap.

What leads should a lead conversion calculator include?

The same definition sales uses. Demo booked, or sales-accepted. Do not mix newsletter signups into a close-rate for demos.

Can a lead conversion calculator give me CAC?

It helps you translate CPA into ads-only cost per customer (CPA ÷ close rate). Full CAC still wants sales and marketing spend ÷ new customers.

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