Running Pace & Race Predictor
Convert pace ↔ time ↔ distance and predict your race times.
Fill in any two of the three fields and the calculator solves the third. The most-recently-edited two are kept fixed.
in · ·
Enter two values to see your pace ✨
Race finish times at your current pace (), plus an even-pace split table.
Even-pace splits
| Split | Elapsed | |
|---|---|---|
| Set a pace in the Calculator tab first. | ||
Enter one recent race result and we'll predict the rest using Riegel's formula T₂ = T₁ × (D₂ / D₁)^1.06.
Your known result
Why you’ll love Running Pace & Race Predictor
Instant & free
No signup, no paywall, no limits — Running Pace & Race Predictor works the moment the page loads.
Completely private
Everything runs in your browser. Nothing you enter is ever uploaded or stored on a server.
Works on any device
Fully responsive and touch-friendly — use it on your phone, tablet or desktop.
Accurate & clear
Built on the real formulas, with a breakdown you can actually trust.
How to use it
Open it
No download and no login — the tool is ready right at the top of this page.
Use it
Enter your details or start interacting. Everything updates live as you go.
Get your result
Copy, download or share your result in a single tap. That’s it.
About Running Pace & Race Predictor
A free running pace calculator and race time predictor that works entirely in your browser with no sign-up required. Convert between running pace, distance, and time instantly. Whether you're training for a 5K or marathon, this tool helps you understand your running speed and set realistic race goals without leaving your device.
Use this pace converter to translate between different units and time formats. Input any two of the three variables—pace, distance, or time—and the calculator solves for the third. Works with both metric and imperial measurements, making it useful whether you train in kilometers or miles.
The race predictor estimates your likely finish times across different distances based on your current performance. Plug in a recent race result or your typical pace, and see what you might achieve at other distances. Helps you set training targets and understand how fitness improvements translate to faster times.
Popular uses
Frequently asked questions
Running pace is the time it takes you to run one unit of distance, usually expressed as minutes per kilometer or minutes per mile. To calculate it, divide your total running time by the distance covered. A pace calculator automates this and lets you work backwards from pace to find distance or time.
Predictions are estimates based on mathematical models of running performance and assume consistent effort and conditions. They're most accurate for distances close to your recent race and less reliable for very different distances. Use predictions as rough guides rather than guarantees—actual performance depends on training, weather, and race-day conditions.
Yes. The tool handles both metric and imperial units. Convert your pace to either system and calculate distances or times in whichever unit you prefer. This is especially useful if you train in one country's standard and race in another's.
Pace and speed are inverses. Pace is time per distance (e.g., 6 minutes per km), while speed is distance per time (e.g., 10 km per hour). Both describe the same performance; this tool works with pace because that's how runners typically think about their running.
Running Pace & Race Predictor is 100% free — no signup, no watermarks and no usage limits. It’s one of 200+ free tools we build and give away.
It uses the standard formulas and shows its working, so you can verify every number. For big decisions, treat the result as a reliable estimate.
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