Enter any two of distance, time, or pace to solve for the third — ideal for planning race splits or goal times.

How to Use the Pace Calculator

Pick which of the three you're solving for — Find Pace, Find Time, or Find Distance — then fill in whichever two fields the mode leaves visible. The third is what the calculator solves for, and it updates live as you type.

Distance, time, and pace are the same relationship stated three different ways, and knowing any two always hands you the third. Run a 5K in 25 minutes and you've run a 5:00-per-kilometer pace, whether you set out to hit that number or not — the arithmetic doesn't care which two numbers you started with.

Working Backward From a Goal

Find Pace answers "how fast did I actually go" from a finish line and a stopwatch. Find Time flips it around — hand it a target pace and a race distance, and it tells you the finish time that pace produces, which is the more useful direction when you're chasing something specific, like a sub-2-hour half marathon, and need to know what per-kilometer number to hold. Find Distance solves the third combination: given how long you ran and at what pace, how far did you actually cover.

Find Pace:     Pace = Total Time ÷ Distance
Find Time:     Total Time = Pace × Distance
Find Distance: Distance = Total Time ÷ Pace

Switching between km and miles changes what "pace" means without changing the math underneath it — a 6:00 mile pace and a 3:44 kilometer pace describe the same actual speed, just measured against a different stick. Set the toggle to whichever unit your race or training plan uses and the pace field follows.

Pacing strategy is the other common use. Elite marathoners run close to even splits deliberately, holding the same per-kilometer pace from start to finish rather than banking time early and fading late — Find Time makes it straightforward to check what a specific even pace adds up to over 21.1 km or the full 42.2, before race day forces the question. One practical shortcut: run a recent 10K, find the pace it produced, then switch to Find Time to see what that same pace translates to over a full marathon distance — a rough gut-check for goal-setting, not a guarantee of how an unfamiliar distance will actually feel.