Runsy
Calculators
Running Calculators
Pace, splits, race predictions, fuelling and heat adjustment. Every calculator ends where it should — with the plan that gets you to the number you just worked out.
- Pace chartsEvery finish time for each distance, with pace per kilometre, pace per mile and split checkpoints — plus a calculator for the exact time you are chasing.4 pages
- Race time predictorPredict your 5K, 10K, half marathon and marathon from one recent result — with two models side by side, so you can see how wide the prediction really is.
- Age grading calculatorYour age-graded percentage and open-class equivalent time, from the 2025 WMA road standards — with the full factor tables printed so you can check the arithmetic.
- Calories burned running calculatorNet and gross calories for any run, from the ACSM running equation. Full tables by body weight and by pace, the formula printed, and its error bars stated.
- Half marathon pace calculatorGoal time to pace, or pace to finish time, plus the full split sheet — every kilometre and every mile for six target times. Even and negative splits.
- Treadmill pace chartConvert treadmill speed to pace per mile and per kilometre, with finish times at every speed and a flat-equivalent pace for any incline.
- VDOT calculatorTurn one race result into your VDOT, your equivalent times at every distance, and the five Daniels training paces. Full table included, no sign-up.
- VO2 max calculatorEstimate VO2 max from a race result, a 12-minute Cooper test, or your heart rate — and see what the other two methods would have to read to agree.
Stop calculating. Start training.
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