Running Pace Calculator
Free running pace calculator. Find your pace, finish time, or distance with support for km and miles. Get speed in km/h and mph plus predicted splits for 5K, 10K, half marathon, and marathon. 100% client-side.
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What is Running Pace Calculator?
The Running Pace Calculator is a free, browser-based tool that helps runners find any one of pace, finish time, or distance when they know the other two. Enter a race distance with your finish time to get your pace per kilometer and per mile, or enter a target pace to see how long a given distance will take. The calculator also converts pace to speed in km/h and mph and predicts finish times for popular race distances from 1 km all the way to a full marathon. Everything runs 100% in your browser with no sign-up and no data uploads.
Key Benefits
- Solves for pace, time, or distance from any two known values
- Automatic km ↔ mile conversion with pace shown in both units
- Live speed readout in km/h and mph alongside your pace
- Predicted finish times for 5K, 10K, half marathon, marathon, and more
- 100% client-side, free, and works offline
Common Use Cases
- •Planning a target finish time for an upcoming 5K or 10K
- •Checking what pace you need to break a marathon time goal
- •Converting a GPS watch pace from per-mile to per-kilometer
- •Estimating how long a training run of a given distance will take
- •Setting pace bands for race-day negative or even splits
How to Use the Running Pace Calculator
- Pick What to Solve For: Choose Find Pace, Find Time, or Find Distance at the top depending on which two values you already know.
- Enter Your Values: Fill in the distance (select km or mi), your time as hours, minutes, and seconds, or your pace as minutes and seconds per km/mi.
- Read the Result: The calculated pace, time, or distance appears instantly along with speed in km/h and mph. Use the copy button to grab the value.
- Check Your Splits: Scroll down to the predicted finish times table to see what your current pace means for 5K, 10K, half marathon, marathon, and more.
Key Features
- Solve for pace, finish time, or distance — whichever two values you enter
- Full unit support: switch between kilometers and miles with automatic conversion
- Live speed readout in both km/h and mph alongside your pace
- Predicted finish times for 5K, 10K, 15K, half marathon, marathon, and more
- Precise H:MM:SS time formatting and M:SS pace formatting with copy-to-clipboard
- 100% client-side and offline-capable — no sign-up, no data uploads