Lap Distance Calculator
A lap distance calculator turns laps into total distance: enter the length of one lap and how many laps you covered, and get the total in meters, kilometers, or miles. It comes with one-tap presets for standard tracks and pools, live unit switching, and copy and share buttons. This version adds the two things runners and swimmers ask for next: a reverse solver that tells you how many laps make up a target distance, and a pace readout from your total time.
Lap distance
Reverse: how many laps for a target distance?
Uses the lap length above. Enter the distance you want to cover and get the exact lap count, rounded up to full laps.
Pace from your total time (optional)
Uses the lap length and lap count above. Enter how long the session took and get your average pace per kilometer and per mile, plus average speed.
Worked example
Distance: lap length 400 m, 12 laps, shown in kilometers: 400 x 12 = 4,800 m = 4.80 km (2.98 miles). Reverse: with a 400 m lap, a 10 km target needs exactly 25.00 laps, so 25 full laps cover 10.00 km. Pace: those 12 laps in 24 minutes give an average pace of 5:00 /km (8:03 /mi) and an average speed of 12.0 km/h (7.5 mph). Enter these values and the calculator reproduces every figure.
How the math works
Total distance is lap length times laps, converted by 1,000 meters per kilometer and 1,609.344 meters per mile. The reverse solver divides the target distance (converted to meters) by the lap length; the exact figure tells you the fractional laps, and rounding up gives the full laps that cover the target. Pace is total minutes divided by total kilometers; per-mile pace multiplies by 1.609344, and speed is distance over hours. Fractional laps are allowed because swimmers and runners often stop mid-lap.
What competing lap calculators miss
The standard tools convert laps to distance and stop, and the laps-to-miles converters only run one direction. None of them answer the follow-up questions in the same place: how many laps is my 10K, and how fast was I actually going. The reverse solver here runs both directions off the same lap length, and the pace readout turns a stopwatch time into per-kilometer and per-mile pace plus speed, which is what training plans are written in.
Frequently asked questions
How many laps is a mile on a standard track?
Just over 4: a mile is 1,609.34 m, so on a 400 m track it takes 4.02 laps. Enter 1 mile as the target in the reverse solver with a 400 m lap to see it.
How many laps are in a 5K on a 400 m track?
12.5 laps exactly. The reverse solver shows 12.50 laps for a 5 km target, so 13 full laps cover it.
What is a lap in swimming vs running?
In running, one lap is one full circuit of the track (400 m outdoors). In swimming, one lap is one length of the pool (25 m or 50 m); some swimmers say "lap" for a there-and-back, so confirm with your pool. The calculator works either way as long as the length you enter matches your counting.
Do outer lanes change the distance?
Yes, slightly: on a standard track, lane 1 is 400 m but lane 8 measures about 453 m per lap because of the wider curves. If you run outside lane 1, measure or look up your lane's length for the most accurate total.
How is running pace calculated?
Divide your total minutes by the total kilometers for minutes per kilometer. A 5:00/km pace equals 8:03 per mile (multiply by 1.609344). The pace section does this from your laps and time.
Can I use this for cycling laps?
Yes. Enter the circuit length in meters and your lap count; the math is identical. For velodrome or criterium training, the pace section gives average speed in km/h and mph.