Calculate running pace, finish time, or race distance - whichever you need. Enter any two values and the calculator finds the third, and shows predicted times for common distances (5K, 10K, half marathon, full marathon) at the same pace.
Time
Pace per km
5:00
min:ss / km
Pace per mile
8:03
min:ss / mile
Predicted finish times at this pace
Predicted finish times assume you can hold the entered pace evenly across the full distance. In reality, longer distances slow you down - use Riegel's formula for a more realistic forecast over marathon and ultra distances.
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Running pace is the language of every runner - from couch-to-5K beginners to elite marathoners. It's how races are paced, training intervals are prescribed, and performance is compared. Pace expressed as 'minutes per kilometre' is the standard in India and metric countries; 'minutes per mile' in the US and UK. This calculator converts between the two and handles any of the three calculations: pace from time + distance, finish time from pace + distance, or distance covered from time + pace.
Beyond simple pace math, the calculator also projects your equivalent times for common race distances (5K, 10K, half marathon, full marathon) at the same effort level. This is useful for goal-setting - knowing that a 6:00 min/km pace gives you a 30-minute 5K but a 4:13:30 marathon helps benchmark your fitness against established race standards. Real-world performance scales sub-linearly with distance (longer races slow you down slightly), so use these projections as 'best-case' references.
Pick the mode: pace from time + distance, time from pace + distance, or distance from pace + time.
Fill the two required values in your chosen units (km or miles).
View the missing value plus a clean min/km and min/mile pace.
Use the predicted race times to gauge your performance against common distances.
Pace is time per unit distance. Running 6:00 min/km means every kilometer takes 6 minutes; over a 10 km race that totals 60 minutes. The calculator handles all three combinations of pace, time, and distance using basic algebra.
Pace = Time / Distance Time = Pace × Distance Distance = Time / Pace
Pace math is simple division and multiplication: Pace = Time / Distance. Time = Pace × Distance. Distance = Time / Pace. The calculator handles unit conversion (km ↔ miles) automatically - 1 mile = 1.609 km, so a 5:00 min/km pace equals 8:03 min/mile. Race distances supported include 5K (3.1 mi), 10K (6.2 mi), half marathon (21.1 km / 13.1 mi) and full marathon (42.195 km / 26.2 mi).
Predicting longer race times from shorter ones (or vice versa) requires Riegel's formula: T2 = T1 × (D2/D1)^1.06. The exponent 1.06 captures the fact that pace slows by roughly 6% per doubling of distance for most amateur runners. So a 25-minute 5K runner's predicted marathon time is 25 × (42.195/5)^1.06 ≈ 240 minutes (4:00:00) - not the naive 211 minutes (3:31:00) that simple proportional scaling would give. The calculator's simple linear scaling is good for nearby distances; for cross-distance predictions use the Riegel adjustment.
Running pace is influenced by terrain, elevation, weather, surface, and individual physiology. A pace that feels comfortable on a flat track may be 30-60 seconds/km slower on hilly trails. Heat increases heart rate at the same pace, effectively making the pace harder. For training prescription, use heart rate or perceived effort alongside pace - running 6:00 min/km in 35°C summer Mumbai is a very different effort than the same pace in 22°C Bangalore winter.
Pace = 50 / 10 = 5:00 min/km (or 8:03 min/mile). Predicted times at this pace: 5K in 25 min, half marathon in 1:45:30, full marathon in 3:30:50. Note: full marathon prediction is optimistic; actual time would be closer to 3:42 with Riegel adjustment.
Distance = 60 / 6.5 = 9.23 km. At this pace a 10K would finish in 65 minutes, half marathon in 2:17, full marathon in 4:34. Reasonable beginner-to-intermediate amateur level.
A 30-minute 5K (6:00 min/km) is a respectable beginner goal. Most casual runners finish 5K between 25 and 35 minutes after a few months of training.
5:41 min/km (9:09 min/mile). It's roughly the median time for amateur marathoners and a popular goal pace.
Multiply min/km by 1.609 to get min/mile. So 5:00/km is approximately 8:03/mile. The calculator does this automatically.
The calculator assumes you can hold the same pace across distances. In reality, longer distances slow you down. Use Riegel's formula (T2 = T1 × (D2/D1)^1.06) for a more realistic prediction.
Combine consistent base mileage at conversational pace, weekly tempo or interval workouts, and one long run per week. Strength training and adequate sleep add up over months.
Pace is time per distance (e.g., 5:00 min/km). Speed is distance per time (e.g., 12 km/h). They're inversely related - higher speed = lower pace number.
Body composition, daily energy needs and pregnancy timelines all rest on formulas validated across millions of people, but no single number tells the whole story. The values from this calculator are point estimates with a known margin of error - body fat from skinfold or US Navy method has roughly a ±3% standard error compared to a DEXA scan, and BMR can vary ±10% person to person at the same height and weight. Use these numbers to track trends week over week, not to chase decimal precision day to day.
Pair this tool with the BMR, TDEE, calorie and macro calculators to turn a single measurement into an actionable plan. None of these tools are a substitute for a qualified doctor, registered dietitian or certified strength coach - but they remove the busywork so you spend more time on training and recovery, less on math.
The Pace Calculator is part of the Health & Fitness suite on Online Calculator Tools, alongside 6 related calculators. All tools share the same UI patterns, the same privacy-first rendering (nothing is sent to a server), and the same commitment to showing the formula and assumptions behind every result.
