Calculate your running pace per mile or km, projected finish time for any race distance, and speed in mph or km/h. Enter any two values to solve for the third — perfect for race planning and training paces.
Your Running Results
Pace—
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Finish Time—
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Race Finish Times at This Pace
Race
Distance
Finish Time
Training Pace Zones
Zone
% of Race Pace
Pace (min/mi)
Purpose
How to Calculate Running Pace
Running pace, time, and distance are related by a simple formula: Pace = Time ÷ Distance. Enter any two variables to solve for the third. This calculator also converts between units (miles/km) and provides training pace zones.
10K — 6.214 miles. Two laps of a 5K. Average finish time: 50–60 minutes.
Half Marathon — 13.109 miles. Average finish: 1:55–2:30.
Marathon — 26.219 miles. Average finish: 4:00–5:00. Boston qualifier: ~3:00.
Training Pace Zones Explained
Easy/recovery runs should be 60–70% of race pace. Tempo runs at 85–90%. Interval work at 95–105%. Most training volume (80%) should be at easy pace — this builds aerobic base without excessive fatigue.
Understanding Running Pace
Running pace is expressed as time per mile or per kilometer — a 9:00/mile pace means 9 minutes per mile. Pace and speed are inverses: 9:00/mile equals about 6.7 mph. Runners typically track pace because it is more intuitive for race planning than speed.
Pace varies significantly by distance and fitness level. A trained recreational runner might hold 9:00/mile for a 5K but slow to 10:30/mile for a marathon. Use your training paces — not race paces — when calculating expected long run duration.
Any pace that lets you hold a conversation (the "talk test") is appropriate. For most new runners, this is 11–13 minutes per mile. Speed improves naturally with consistency — after 2–3 months of regular running, most beginners speed up to 9–11 min/mile without specifically trying to run faster.
Average recreational times: 5K — 30–35 min; 10K — 60–75 min; half marathon — 2:15–2:45; marathon — 4:30–5:30. Competitive age-group runners target 5K under 25 min, half marathon under 2:00, and marathon under 4:00.
Multiply target pace (min/mile) by race distance in miles. A 10:00/mile pace for a half marathon (13.1 miles) = 2:11:00 target. Most experienced runners start slightly slower than goal pace and negative split — running the second half faster — which consistently produces better finish times than going out too hard.
Target: finish 26.22 miles in under 4:00:00. Required pace = 240 minutes ÷ 26.22 miles = 9:09/mile (5:41/km). To build in a safety buffer, train to run at 9:00/mile. Easy long runs should be at 10:30–11:00/mile (Zone 2). Tempo runs at 8:20/mile. If you complete a half marathon in 1:52, the McMillan Running Formula projects a 3:55 marathon — confirming readiness with smart pacing.
Heat significantly slows running performance. Research shows that for every 10°F (5.5°C) above 55°F (13°C), running pace slows by approximately 1–2% for most recreational runners. At 80°F (27°C), that translates to about 45–90 seconds per mile slower than equivalent effort in cool conditions. Humidity compounds this effect by reducing sweat evaporation. Adjust your pace goals on hot days and focus on effort level rather than pace targets.