Luke Duff

Enquiry leak calculator

Put in your own numbers and see how many enquiries slip through the gaps.

Lab 02 of 09

  • Interactive calculator
  • Live charts
  • Works on any phone

Try it

Lab 02 of 09

Your numbers. Change them.

The starting numbers are examples I picked, not averages or research. Nothing you type is stored or sent.

Calls

Calls you couldn't answer and didn't get back to.

Example

Your best guess, out of every 100 of those callers.

Example
Quotes

Every quote or estimate, won or not.

Example

Sent, then no reply either way.

Example

Your guess. A cautious one is more useful.

Example
Job value and invoices

What a typical job, order or contract is worth to you.

Example

Set to 0 to leave this out. It uses your average job value.

Example

Work that could be slipping through

 a month

  a year

Worked out from example numbers. Change them to yours.

  • Missed calls  
  • Quiet quotes  
  • Unpaid invoices owed, not lost

Unpaid invoices aren't in the total: that's money owed to you, not work lost. These are your numbers, not a promise.

How this is worked out

Only the numbers you put in: no averages and no industry figures. Every job and every invoice uses your average job value, and each line is rounded to the nearest pound before it's added up.

How it's built

Every number is yours: change one and everything updates as you type. The figures shown first are examples to start from, not facts about your business.

The leak drawing is plain CSS animation that pauses when it's off screen, and the sums run in your browser. Nothing you type leaves the page.

  • Interactive calculator
  • Live charts
  • Works on any phone

Want something like this on your site?

I reply the same working day, in UK hours.

Or ring 07935 996850. If I can't pick up, leave a message or WhatsApp me.

5.0 from 31 Google reviews (checked Nov 2026)