Free tool

Email Response Time Calculator: the Cost of Slow Replies

Enter your monthly inbound leads, your current and target first-response times, and your own estimate of how each converts. The calculator shows the extra conversions and the revenue at stake per month. It does not assume any conversion rate for you.

Your numbers

Every value below is your estimate. The tool does not assume a conversion rate for you, and the starting values are placeholders, not benchmarks.

Your estimate. New inquiries only, not replies in an existing thread.
Your estimate. Average time from a lead's email to your first real reply.
Your goal. Used as a label for the comparison.
Your estimate. The share of leads that become customers at your current response time.
Your estimate. What you believe the share would be if you replied at the target time. Use your own history where you can.
Your estimate. Average revenue from one new customer, in your own currency.

Estimated result

0
revenue at stake per month, in your currency
Extra conversions per month
0
Response time compared
0 hours today, 0 hours target
Conversion rates compared
0% today, 0% at target

This figure depends entirely on your own conversion estimates. Change either rate and the result changes with it.

How this was calculated 
Extra conversions / month = Leads x (Conversion at target - Conversion at current)
Revenue at stake / month  = Extra conversions x Average deal value

The response times are labels for the two scenarios. They do not change the math: the tool has no built-in link between response time and conversion, so that link is whatever your two conversion rates say it is.

Results depend entirely on the numbers you enter. This is a planning estimate, not a forecast. Everything runs in your browser, and inboxr does not store what you enter.

Common questions

How is the revenue at stake calculated?

Extra conversions per month equal your leads multiplied by the difference between your conversion rate at the target response time and at the current one. Revenue at stake is extra conversions multiplied by your average deal value.

Where do the conversion rates come from?

From you. The tool does not supply a benchmark. Use your own history if you have it, for example by comparing leads you answered within an hour against leads you answered the next day.

What is first response time?

The time between a customer or lead sending a message and your first real reply. An automatic acknowledgment does not count.

What if I do not know my conversion rate at a faster response time?

Try a cautious figure and a hopeful figure and compare the two results. The gap shows how sensitive the answer is to that one assumption.

Is my data sent anywhere?

The calculation runs in your browser. The numbers you enter are kept in the page address so the result can be bookmarked, and they are not stored by inboxr.

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