PaceLab
15 free running tools

Running Pace
Calculator

Find your pace. Nail your race.

PaceLab is a free browser-based calculator that instantly converts running pace, time and distance into each other and predicts race finish times. Solve for any one value from the other two, predict a finish time, or plan your splits, all in your browser.

Solve for
Pace
5:00
min/km
Finish time
25:00
h:mm:ss
Distance
5.00
kilometres

That is 5:00 min/km and 8:03 min/mile, a speed of 12.00 kph (7.46 mph).

Need a single value? Try the finish time calculator or the race time predictor.

Calculators

Pace Calculator->

Solve for pace, time or distance from the other two, in km or miles.

Finish Time Calculator->

Turn a target pace and distance into a projected finish time.

Treadmill Pace Converter->

Convert treadmill speed (mph or kph) to pace per mile and per km.

Predict & plan

Race Time Predictor->

Predict a finish time from a known result using Riegel's formula.

Splits Calculator->

Plan even or negative splits per km or mile for a goal time.

Pace charts

1 Mile Pace Chart->

Finish times mapped to required pace for exactly one mile.

5K Pace Chart->

Finish times mapped to required pace for the 5K distance.

8K Pace Chart->

Finish times mapped to required pace for the 8K distance.

10K Pace Chart->

Finish times mapped to required pace for the 10K distance.

15K Pace Chart->

Finish times mapped to required pace for the 15K distance.

10 Mile Pace Chart->

Finish times mapped to required pace for exactly ten miles.

Half Marathon Pace Chart->

Finish times mapped to required pace for 21.0975 km.

Marathon Pace Chart->

Every marathon finish time from 2:30 to 6:00 mapped to the pace it needs.

Guides

How to Calculate Pace->

The pace formula, worked examples, and how to predict pace at any distance.

Pace Conversion Table->

Convert any pace between min/km, min/mile, kph and mph at a glance.

One calculator for every run

Whether you train in kilometres or miles, PaceLab keeps the numbers straight. The pace calculator above is the quick way to answer the three questions runners ask most: how fast am I going, how long will this take, and how far did I go? Enter any two values and the third appears instantly, along with the equivalent pace in min/km and min/mile and the matching treadmill speed in kph and mph.

Beyond the core solver, the toolkit covers the whole training cycle. Use the race time predictor to turn a recent 5K or 10K into a realistic marathon goal, then build an even or negative split plan with the splits calculator. On the treadmill, the treadmill pace converter translates belt speed into the pace you actually feel outdoors. And when you just want a reference, the pace charts, from the mile up to the marathon, map every finish time to the pace you need to hold. New to the maths behind it all? Start with how to calculate running pace. Everything is free, private and runs without an account.