Page Speed Conversion Impact Calculator

Work out page speed conversion impact instantly with clear inputs, formula shown and shareable results.

About Page Speed Conversion Impact Calculator

Published studies consistently find each second of load time costs several percent of conversions, and this model applies a 7% relative uplift per second saved. The largest gains come from the first seconds removed, not the last.

Formula

Speed impact

Uplift = seconds saved × 7%; new rate = current rate × (1 + uplift)

Worked example

With the default values below, Page Speed Conversion Impact Calculator returns Projected Conversion Rate of 2.5388%. Change any input above and every figure here is recalculated in your browser.

Inputs used

Current Load Time In Secondsaccepts 0.1–30: 4.2
Target Load Time In Secondsaccepts 0.1–30: 2
Current Conversion Rateaccepts 0.01–100 %: 2.2 %
Monthly Visitorsaccepts 1–100,000,000: 150,000

Results

Projected Conversion Rate: 2.5388%
Relative Conversion Uplift: 15.400%
Load Time Saved: 2.20 seconds
Additional Monthly Conversions: 508.2

Step by step

1Values used
2Speed impact
3Projected Conversion Rate= 2.5388
4Relative Conversion Uplift= 15.400
5Load Time Saved= 2.20 seconds
6Additional Monthly Conversions= 508.2

Assumptions and limits

The result is derived only from the 4 inputs listed above. Anything not among them is not part of the calculation.
In particular, this calculator does not take inflation, tax or compounding frequency into account.
Figures are rounded for display to 4 decimal places, so totals built from several rounded parts can differ slightly from the unrounded arithmetic.
Figures are estimates based on the inputs given. Marketing performance, platform fees and conversion behaviour vary by audience, channel and season. Use this as a planning guide, not a forecast.
This is an estimate for general information and not professional financial, tax or legal advice. See the full disclaimer for the limits that apply to this kind of calculator.

How these calculators are built and tested is described on the Methodology page. If a figure looks wrong, please report it.

Figures are estimates based on the inputs given. Marketing performance, platform fees and conversion behaviour vary by audience, channel and season. Use this as a planning guide, not a forecast.

Frequently Asked Questions

Is the 7% figure reliable?

It is a widely cited average. Your own before-and-after measurement is always the better evidence.

Which improvements matter most?

Reducing render-blocking assets, image weight and third-party scripts usually produce the biggest wins.