Pace Calculator

How to use Pace Calculator

1. Open Pace Calculator in your browser — it loads instantly and works offline once cached.
2. Enter your values in the input fields. Every field is labelled so you know exactly what to type.
3. The result updates automatically as you type — there is no "submit" round-trip to a server.
4. Adjust any input to compare scenarios and see how the outcome changes in real time.
5. Copy or note the result. Nothing you enter is stored or sent anywhere.

Why use Pace Calculator?

• 100% free with no limits, no sign-up and no watermarks.
• Private by design — your data are processed in your browser and never uploaded to a server.
• Fast and lightweight, with instant results even on a phone or a slow connection.
• Works everywhere — any modern browser on Windows, macOS, Linux, Android or iOS.
• Part of a full health & fitness suite, so related pace tasks are one click away.

What people use Pace Calculator for

• Working out the pace needed to finish a race in a target time.
• Converting between minutes per kilometre and minutes per mile.
• Planning splits for a long run.

Pace Calculator: limits and things worth knowing

• Pace is time divided by distance; speed is distance divided by time. A 5:00/km pace is 12 km/h, and mixing the two up is the usual source of confusion.
• A marathon in under 4 hours needs about 5:41/km or 9:09/mile held for the whole distance — useful to see stated as a pace rather than a finish time.
• Course elevation, heat and wind all change the pace achievable for the same effort, so a flat-course target is not transferable.
• Most training plans use negative splits — running the second half slightly faster — because starting too fast is the most common cause of a poor finish.

Is it private and secure?

Your privacy is built in. Pace Calculator runs completely on your device, so whatever you enter stays in your browser and is never transmitted, logged or stored on any server.

Network activity: none. Nothing is sent and nothing is fetched. This tool makes no network request at all once the page has loaded — which is why it keeps working if your connection drops.

You do not have to take that on trust — our privacy proof page publishes the Content-Security-Policy that enforces it, lists every third party it permits, and shows how to verify the whole claim yourself.

Learn more

Why Browser-Based Tools Are Safer for Your Files — Most online converters upload your files to a server. Client-side tools don't. Here's why that difference matters for privacy.