Quickly flip between running pace and speed without doing mental gymnastics. Enter any two of distance, time, pace, or speed, and the tool computes the missing values instantly. Ideal for runners, cyclists, and rowers planning workouts or race strategies.
Whether you train in kilometres or miles, the calculator adapts on-the-fly. Save time, stay focused, and fine-tune targets for intervals, tempo sessions, or long runs with a few clicks.
Skip spreadsheets and crunch numbers in seconds. Highlights include:
Behind the scenes, the tool relies on simple, time-tested equations:
t = (hours × 3600) + (minutes × 60) + seconds
pace (min/unit) = (t / 60) / distance
speed (unit/hour) = distance / (t / 3600)
1 mile = 1.609344 kmVariables update live as you edit any field, ensuring consistent results.
Get the most accurate readings in five quick moves:
Yes. Toggle between kilometres and miles at any time—the calculator updates pace and speed instantly.
While it doesn’t graph splits, you can recalculate new target paces for each segment by adjusting the distance and time fields.
Rounding keeps results readable. Calculations use full precision internally, then display the nearest whole second.
Absolutely. There are no ads, trials, or subscriptions—just bookmark and come back whenever you need it.