About Pace Calculator Online

Pace Calculator Online is a free tool that helps runners, joggers and walkers answer three everyday questions: How fast am I going? How long will this take? How far can I get? Enter any two of distance, time and pace and the calculator instantly works out the third, along with split times, equivalent race finishes and speed in both km/h and mph.

Why we built it

Most pace calculators are slow, cluttered or buried in pop-ups. We wanted something that loads instantly on a phone at the start line, works without an account, and does the maths the moment you press a button. The whole site is lightweight and runs the calculation in your browser — nothing you type is sent anywhere.

Who it's for

• New runners setting a first 5K or 10K goal.
• Race-day planners working out the exact pace needed for a target time.
• Coaches and pacers building split sheets and pace bands.
• Walkers and cyclists who think in distance and time too.

How it works

Pace is just total time divided by distance, and we convert between kilometres, miles, minutes-per-unit and km/h or mph for you. For a full explanation of the formulas, training paces and race-day pacing strategy, see the guide on the home page.

Accuracy & disclaimer

The calculator is accurate for the arithmetic it performs. Race-time predictions based on a single pace are estimates only — real performance depends on terrain, weather, fitness and pacing. Use the results for planning and motivation, and consult a qualified coach or medical professional for personalised training or health advice.

Get in touch

Suggestions or found a bug? Email hello@pacecalculator.online — we read every message.