Pace Calculator
Calculate running pace, finish times, distances, splits, and training speeds easily.
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Pace Calculator
Enter your time and distance.
Get your pace per mile, pace per kilometer, speed in mph and km/h, and a full split table.
Already know your pace? Flip it. Find your finish time. Or find your distance.
That’s it. That’s the tool.
How to use it
- Pick a mode: Calculate Pace, Calculate Time, or Calculate Distance. Tabs at the top.
- Enter what you know: Time, distance, or pace, depending on the mode you picked.
- Pick your units: Miles, kilometers, meters, yards. Or just select a race from the event dropdown and skip typing the distance yourself.
- Hit Calculate: Your result shows up instantly below the form.
- Check your splits: Kilometer and mile splits, side by side, all the way to your finish distance.
- Copy, export, or print: Copy the summary to your clipboard, download the full split table as a CSV, or print it for race day.
No sign up. No app download. Works on your phone at the start line.
What’s actually in this calculator
Three calculation modes: Pace, finish time, or distance. Switch between them without reloading the page.
Built in event picker: Marathon, half marathon, 10K, 5K, 1500m, and more. No need to remember exact distances.
Dual unit splits table: Kilometers and miles, side by side. No separate calculators, no manual conversion.
Popular race distance breakdown: See what your pace means at 1K, 5K, 10K, half, and full marathon, all at once.
One click export: Copy your results, download splits as a CSV, or print a clean summary.
Works in any unit: Miles, kilometers, meters, yards. Pace per mile, per km, per 400m, per 800m, per 1500m.
Mobile friendly. Built for checking on your phone before a race, not just at a desk.
Why it’s worth using
- Saves you from doing pace math in your head, mid run, when you’re tired and it’s exactly when you’ll get it wrong.
- Cuts race day guesswork. Know your splits before you’re standing at the start line.
- Works for more than running. Same math covers walking, cycling, swimming, any distance based activity.
- One tool instead of three. Pace, time, and distance calculators, usually separate, all in one place here.
- Free. No account. No paywall on the splits table.
Pace vs speed (nobody actually talks in mph)
Here’s the thing.
Your car’s speedometer shows speed. Distance over time. Simple.
Runners don’t think that way.
Ask a runner how fast they went and they won’t say “8 miles per hour.” They’ll say “7:30 pace.”
Same number. Flipped around.
And that’s exactly the number you’re staring at when you’re mid run trying to figure out if you’re on target.
This calculator does the flip for you. No mental math at kilometer 8.
What people actually use this for
Three situations, basically.
You have a goal race time: You know the distance. You want the pace. Enter your time, pick the distance (there’s a dropdown; don’t worry about remembering a half marathon is 13.1 miles and not 13).
You just ran something: You know your time and distance. You want the pace spelled out, not calculated in your head during your cooldown.
You’re planning a long run around time, not distance: Enter your usual pace and how much time you’ve got. See how far that gets you.
Simple math. People still get it wrong constantly.
Why? Minutes and seconds. Base 60. Under fatigue. Bad combination.
The split table is the part people actually use
Kilometer splits on the left. Mile splits on the right. Same table.
No flipping between two calculators.
Sounds small. Isn’t.
Ever trained in miles and raced on a course marked in kilometers? It happens more than you’d think.
Check both columns before race day. Know exactly what you’ll see on the course.
Why your pace plan falls apart in mile one
Ask anyone who’s blown up in the last 10K of a marathon what happened.
Same answer every time: went out too fast early. Didn’t notice until it was too late.
A pace target looks slow on paper. Feels even slower when you’re fresh at the start line.
So you speed up. Without meaning to.
Look at what your goal pace means for kilometer 1 specifically. Not the average. The first one.
Practice hitting that number even when it feels artificially slow.
It’s not a mistake. It’s the plan working.
How that pace stacks up across other distances
Your pace also gets mapped across 1K, 5K, 10K, half, and full marathon.
Worth a glance even if you’re not racing all of them.
Why? Because it shows you something fast.
A pace you can hold for 5K almost never survives a marathon.
Plug in your 5K pace. Watch the marathon number jump.
That tells you more than any coach’s warning.
Quick answers
Miles or kilometers, which is more accurate?
Neither. Same measurement, different units. Use whatever’s on your race course.
My watch shows a different pace. Which one’s right?
GPS drifts under tree cover, tunnels, tight turns. This calculator works off your actual time and distance. Usually the more trustworthy number.
Does this work for cycling or walking?
Yes. Same math either way. Cyclists usually think in speed out of habit – this gives you both.
What pace do I need for a sub 4 hour marathon?
9:09 per mile. 5:41 per kilometer. Enter 4:00:00, pick Marathon from the dropdown, get your full splits.
Does elevation change the result?
No. This only works off time and distance. Two runs at the same pace can feel totally different depending on terrain. Compare similar routes when tracking fitness.