π Pace Calculator
Turn any time and distance into pace per mile, pace per km, and speed.
Your Pace
How to Use This Pace Calculator
A 25:00 5K sounds fast until someone asks what that means per mile, and then the mental math stalls. This calculator answers that instantly: type in any time and any distance, and it returns your pace per kilometer, pace per mile, and speed in both km/h and mph. It works for races, training runs, treadmill sessions, and cycling splits alike.
Enter your time using the hours, minutes, and seconds boxes. A 25-minute 5K is just 25 in the minutes box.
Type the distance and pick kilometers or miles. Use decimals for odd distances, like 13.1 for a half marathon in miles.
Read your pace per km at the top, with pace per mile and both speed figures underneath. Everything updates as you type.
Comparing two runs? Run each one through and compare the per-km or per-mile pace directly, since pace already adjusts for distance.
The Pace Math: One Division Does It All
Pace is simply time divided by distance, and speed is the inverse: distance divided by time. The only subtlety is unit conversion, because a minute per kilometer and a minute per mile differ by a factor of 1.609344. Multiply a min/km pace by 1.609344 to get min/mile, or divide to go the other way. Speed follows from the same numbers: 12 km/h is 7.46 mph, the same effort expressed two ways.
Worked Example: 25:00 for 5K
Divide 1,500 seconds by 5 km to get 300 seconds per km, which is 5:00/km. Convert: 5:00 times 1.609344 gives 8:03 per mile. Speed is 5 km divided by 0.4167 hours, which is 12.0 km/h, or 7.46 mph. Type those numbers into the calculator above and you will see exactly these results.
What Your Pace Number Actually Tells You
Pace is the common language of runners because it already accounts for distance. A 5:00/km 5K and a 5:00/km 10K are the same intensity per step, even though the 10K takes twice as long. That makes pace the right number for comparing workouts across distances, tracking fitness over months, and setting training targets. Speed in km/h or mph says the same thing differently and matters more on a treadmill or bike, where the display shows speed, not pace.
One caution: pace ignores hills, wind, heat, and altitude. A 5:00/km on a flat cool morning is not the same effort as 5:00/km on a hilly hot afternoon. Use pace to compare similar routes and conditions, and treat it as approximate when conditions change. Heart rate or perceived effort fills the gap pace leaves.
Using Pace in Training
Most training plans speak in pace. Easy runs usually sit 60 to 90 seconds per mile slower than 5K race pace. Tempo runs hover near the pace you could hold for about an hour. Intervals run faster than 5K pace with full recovery between reps. Plug a recent race into this calculator to find your baseline pace, then add or subtract the prescribed seconds to set each workout. Re-test every 6 to 8 weeks, because as fitness improves the same effort produces a faster pace, and training targets should move with it.
For race day, pace is also your control dial. Going out 15 seconds per mile faster than goal pace in the first mile is the classic way to blow up a marathon. Many runners write their goal pace on their hand or set watch alerts per mile. Knowing the exact per-mile or per-km number before the start line is what makes that discipline possible.
Pace Benchmarks: What the Numbers Mean
Raw pace numbers gain meaning against familiar benchmarks. A 20:00 5K is 4:00/km or 6:26/mi, the classic club-runner standard. A 25:00 5K is 5:00/km or 8:03/mi, a strong recreational result. A 30:00 5K is 6:00/km or 9:39/mi, where many beginners land after a few months of training. Over the marathon, 3:00 needs 4:16/km, 4:00 needs 5:41/km, and 5:00 needs 7:07/km. Knowing these anchors lets you read any result instantly: when a friend says they ran 1:45 for the half, you know that is 4:59/km without touching a calculator.
Benchmarks also expose the gap between distances. If your 5K pace is 5:00/km but your 10K pace is 5:30/km, the fade is bigger than fitness alone explains, and endurance work is the fix. If both sit at 5:10/km, your aerobic base is balanced and speed work will move both. Pace comparisons across your own race history are the most honest fitness test you own, because the same course in similar conditions removes every variable except you.
A final practical note: save your key pace numbers where you will see them. Many runners keep a note on their phone with 5K pace, 10K pace, easy pace, and tempo pace, updated after every race. When a workout calls for a pace you have not memorized, the calculator is one tap away, and the numbers stay consistent because they all come from the same race result.
A Second Worked Example: Marathon Pace for 3:45
A 3:45 marathon is 3 times 60 plus 45, which is 225 minutes, over 26.2 miles. Divide 225 by 26.2 and you get 8.587 minutes per mile. The 0.587 of a minute is 0.587 times 60, which is 35.2 seconds, so the pace is 8:35 per mile. In kilometers, 225 divided by 42.195 is 5.333 minutes per km, and 0.333 times 60 is 20 seconds, giving 5:20 per km.
Check it against a friendlier distance to build intuition. A 3:45 marathoner running a 10K should hold roughly the same effort, which at 5:20 per km is 53:20 for 10K. If their actual 10K best is 48 minutes, the marathon goal is soft and they can aim higher; if it is 58 minutes, 3:45 will demand a breakthrough. Pace ties every distance together, which is why one honest time trial calibrates a whole season.
Min/km vs Min/mi: Converting on the Fly
One kilometer is 0.621371 miles, so a per-km pace converts to per-mile by dividing by 0.621371, the same as multiplying by 1.60934. A 5:00 per km pace becomes 8:03 per mile: 5 times 1.60934 is 8.0467 minutes, and 0.0467 times 60 is 2.8 seconds. Going the other way, multiply a per-mile pace by 0.621371: 8:00 per mile is 4.97 minutes per km, which is 4:58 per km.
The mental shortcut: per-mile pace is about 61 percent higher than per-km pace. A 5:30/km runner is roughly an 8:51/miler. This matters when following training plans from another country or reading race reports; a "sub-4:00/km" workout is 6:26/mile pace, brisk but not the sprint it might sound like to mile-trained ears. When in doubt, the calculator converts both ways without the arithmetic.
Pace vs Speed: Two Sides of One Coin
Pace is time per distance; speed is distance per time. They are reciprocals: speed in mph equals 60 divided by pace in minutes per mile. An 8:00/mile pace is 7.5 mph; a 6:00/mile pace is 10 mph. Cyclists and treadmill users live in speed, runners live in pace, and the treadmill display that shows both is just showing you the same number twice.
Each unit hides something. Pace hides how pace changes feel: dropping from 10:00 to 9:00 per mile is a bigger speed jump, 6.0 to 6.7 mph, than dropping from 7:00 to 6:30, 8.6 to 9.2 mph, even though both are "30 seconds faster." Speed hides effort evenness: holding 7.5 mph on rolling hills means surging and fading, while holding 8:00 pace means steady effort. Runners prefer pace because races are measured in time at fixed distances, and even effort wins races.
Race-Day Pace Bands That Actually Work
A single target pace is brittle; a 10-second band is forgiving. For a goal built on 8:35 miles, plan to run 8:30 to 8:40 through the middle miles. The band absorbs water stops, crowds, and GPS wobble without blowing up the plan. Check the average at each mile marker, not the instant pace on your watch, which jumps with every tree and tunnel.
Split the race into thirds in your head. First third: run the slow end of the band, 8:38 to 8:42, while the crowd drags you fast. Middle third: settle into 8:33 to 8:37. Final third: run what you have, which on a good day is 8:25 to 8:30 and on a bad day is simply holding 8:40. Negative splits, second half faster than the first, beat even splits for most runners because they keep you out of oxygen debt early. The pace band is the plan; the discipline to start slow is the hard part.
Frequently Asked Questions
How do I calculate running pace manually?
Divide your time in seconds by the distance. A 30-minute 10K is 1,800 seconds divided by 10 km, which is 180 seconds per km, or 3:00/km. For miles, multiply the per-km pace by 1.609344. This calculator does all of that automatically, including the speed conversions to km/h and mph.
What is a good running pace for a beginner?
Most new runners settle between 7:00 and 9:00 per km (about 11:15 to 14:30 per mile) on easy runs, often with walk breaks mixed in. The right pace is one where you can still speak in full sentences. Speed builds with consistent weeks, not by forcing a faster pace before your body is ready.
How do I convert min/km to min/mile?
Multiply the min/km pace by 1.609344. A 5:00/km pace becomes 8:03 per mile. To go from min/mile to min/km, divide by 1.609344 instead, so an 8:00 mile is 4:58 per km. The calculator above handles both directions, plus the matching speeds in km/h and mph.
What is the difference between pace and speed?
Pace is time per unit of distance, like 5:00 per km. Speed is distance per unit of time, like 12 km/h. They describe the same effort from opposite directions, and one converts directly to the other. Runners usually talk pace, while treadmills and cyclists usually talk speed.
Why is my treadmill pace different from outdoor pace?
Treadmills estimate speed from belt rotation and their calibration drifts, so the displayed pace can be off by several percent. Outdoors, GPS watches also wobble, especially on twisty routes or under trees. Treat both as close estimates and compare treadmill runs only to treadmill runs.
How do I pace a race evenly?
Divide your goal time by the race distance to get the exact per-mile or per-km pace, then aim to hit that number at every split. Most runners go out too fast, so plan the first mile 5 to 10 seconds slower than goal pace and settle in. Even pacing is the fastest strategy for most distances.
What pace should I run my easy days?
A reliable rule is 60 to 90 seconds per mile slower than your current 5K race pace, or roughly 1:00 to 1:30 per km slower. Easy pace should feel comfortable enough for full sentences. Running easy days too fast is the most common training mistake and it sabotages the hard days.
Does pace account for hills?
No, raw pace ignores elevation, wind, heat, and altitude completely. A hilly 5:30/km can be a harder effort than a flat 5:00/km. For hilly routes, many runners use grade-adjusted pace estimates or go by heart rate and perceived effort instead of the raw number on the watch.