PaceLab
9 free running tools

Find your pace.
Nail your race.

PaceLab turns pace, time and distance into clear numbers you can train and race by. Solve for any one 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 (kph or mph) to pace per km and per mile.

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

5K Pace Chart->

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

10K Pace Chart->

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

Half Marathon Pace Chart->

Finish times mapped to required pace for 21.0975 km.

Marathon Pace Chart->

Finish times mapped to required pace for 42.195 km.

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 5K, 10K, half marathon and marathon pace charts map every finish time to the pace you need to hold. Everything is free, private and runs without an account.