Pace Calculator
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Calculate your running pace, speed, or finish time. Works for 5K, 10K, half marathon, marathon or any custom distance.
Pace
5:30 /km
📐 Formula
Pace (min/km) = Time (seconds) ÷ Distance (km) ÷ 60. Speed (km/h) = 3600 ÷ Pace (sec/km). Finish Time = Pace × Distance
How to Use the Pace Calculator
Choose your calculation type
Select whether you want to calculate pace from distance and time, finish time from distance and pace, or distance from time and pace.
Enter your values
Input distance in km or miles and time in hours, minutes, and seconds. For finish time calculation, enter your target pace per km or per mile.
Select your target race distance
Use the race time estimator to see projected finish times across standard distances (5K, 10K, half marathon, marathon) based on your current pace.
Use splits for training
The split calculator shows your required pace per km or per mile for a target finish time — essential for pacing strategy in long races.
Understanding Running Pace
Running pace (time per distance unit) and speed (distance per time unit) are inverses of each other. To convert: Speed (km/h) = 60 ÷ Pace (min/km). A 6:00/km pace equals 10 km/h. A 5:00/km pace equals 12 km/h. Most runners think in pace because it directly maps to effort — you run to a target time per kilometre rather than a speed readout, which is why GPS watches display pace by default.
Pace Benchmarks for Common Race Distances
5K: Beginner 8–9 min/km (40–45 min finish); Intermediate 5:30–6:30/km (27–32 min); Advanced under 4:30/km (under 22 min). 10K: Beginner 8–9 min/km (80–90 min); Intermediate 5:30–6:30/km (55–65 min); Advanced under 4:30/km (under 45 min). Half Marathon (21.1km): Sub-2 hours requires 5:41/km average. Marathon (42.2km): Sub-4 hours requires 5:41/km; sub-3:30 requires 4:58/km; sub-3 hours requires 4:15/km.
The 10% Rule: Avoiding Overtraining Injuries
The most widely cited guideline in running injury prevention is the 10% rule: do not increase weekly mileage by more than 10% from one week to the next. Running injuries (shin splints, stress fractures, IT band syndrome, plantar fasciitis) are predominantly overuse injuries caused by increasing volume or intensity faster than connective tissue can adapt. Muscles adapt faster than tendons and bones — feeling capable of running more does not mean your tendons are ready. A conservative build phase with scheduled easy recovery weeks every 3–4 weeks dramatically reduces injury risk for runners at all levels.
Easy vs Hard Runs: The 80/20 Principle
Research on elite distance runners consistently shows approximately 80% of training volume at easy pace (conversational, below lactate threshold) and 20% at hard effort. For most amateur runners, the inverse is true — almost all runs feel moderate-to-hard. Easy runs should be slower than you think: for a runner whose 5K pace is 5:30/km, easy pace is typically 7:00–8:00/km. Running too hard on easy days impairs recovery, reduces training quality on hard days, and increases injury risk. Use pace targets from this calculator to set zone boundaries for each training run.
Sources & Methodology
Calculations are based on the most current publicly available data from authoritative government and industry sources:
Frequently Asked Questions
A comfortable beginner pace is 8–10 minutes per km (13–16 min/mile). For a 5K, that's 40–50 minutes. Focus on finishing without stopping before worrying about pace.
You need to average 5:41 per km (9:09 per mile) to finish a half marathon (21.1 km) in exactly 2 hours. Aim for 5:35/km in training to have a buffer.
Speed (km/h) = 60 ÷ pace (min/km). For example, a 6:00/km pace = 10 km/h. A 5:00/km pace = 12 km/h.