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.
Frequently asked questions
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.
Completely. Running Pace & Race Predictor runs entirely in your browser (client-side). Nothing you type, upload or generate is sent to our servers, so your data never leaves your device.
No. It works instantly in any modern web browser — Chrome, Safari, Edge or Firefox — on desktop and mobile.
Yes. The tool is fully responsive and touch-friendly, so it works great on phones and tablets as well as computers.
Global Maple System — a software & AI studio. We built Running Pace & Race Predictor (and 200+ other free tools) to show what we can do. Need something custom built? We’d love to help.
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Running Pace & Race Predictor is one of 200+ free tools from Global Maple System — a software & AI studio. Need a website, app, AI agent or automation? Let’s talk.