Pace Calculator
Solve for pace, finish time, or distance — with race projections at your pace
5K = 3.11 mi · 10K = 6.21 mi · Half = 13.11 mi
Related calculators
All health & fitness- Calories Burned CalculatorCalories burned for 25 activities using Compendium MET values
- Heart Rate Zone CalculatorFind your 5 heart rate training zones using max heart rate
- Target Heart Rate CalculatorFind your 5 training heart rate zones using the Karvonen method
- One-Rep Max Calculator1RM from any set (Epley & Brzycki) with 65-95% training loads
- VO2 Max CalculatorEstimate cardio fitness (VO₂ max) from resting heart rate
- BMR CalculatorBasal metabolic rate (calories at rest) via Mifflin-St Jeor
Quick summary
Enter any two of pace, time, and distance to get the third. Pace = time ÷ distance: a 45-minute 5-miler runs 9:00/mile (6.7 mph). The race table projects even-pace finish times — 9:00/mile is a 27:58 5K, 57:56 10K, 1:57:59 half, and 3:55:58 marathon.
Reviewed by Simple Calculators TeamLast reviewed
For information only — not medical advice. Results are estimates from published formulas and can't account for your health history. Talk to a doctor or other qualified clinician before making health decisions.
How to use this calculator
- Enter the inputs requested by the calculator.
- Choose the units or options that match your situation and review the assumptions.
- Run or update the calculation to see the result.
- Review the result, breakdown, and formulas shown on the page.
- Check the inputs, units, dates, and limitations before saving or sharing the result.
Frequently asked questions
How do I calculate my running pace?
Divide total time by distance. A 30-minute 5K is 30 ÷ 3.107 = 9:39 per mile (6:00 per km). Pace is the runner's convention; speed (mph) is the same number inverted.
What is a good running pace?
Recreational runners commonly train between 9:00 and 12:00 per mile; a 30-minute 5K (9:39/mi) is a solid benchmark, and sub-25 (8:03/mi) is genuinely quick. Easy runs should feel conversational — for most people that's 1–2 min/mile slower than race pace.
How do I pace a marathon?
Common guidance: start 10–15 seconds per mile slower than goal pace for the first few miles, settle into goal pace, and expect the real race to begin at mile 20. The projection here assumes even pacing — going out too fast is the classic marathon mistake.
What pace do I need for a 4-hour marathon?
9:09 per mile (5:41 per km) held for 26.2 miles. For 3:30 it's 8:00/mi; for the Boston-qualifying 3:00 it's 6:52/mi. Use time mode with the marathon distance to test any goal.
Key terms
- Pace
- Time per unit distance (min/mile or min/km) — the inverse of speed.
- Negative Split
- Running the second half faster than the first — the pacing strategy behind most distance PRs.
- Even Pacing
- Holding constant pace throughout — what the race projections here assume.
- Race Distances
- 5K = 3.107 mi, 10K = 6.214 mi, half marathon = 13.109 mi, marathon = 26.219 mi.
Methodology, sources & limitations
This page shows the formula, assumptions, and limitations used for this estimate. Rates, thresholds, and other time-sensitive inputs can change, so verify them against the relevant official source before relying on a result.
For our review approach and the primary sources we consult, see the methodology and source policy. If you spot an outdated figure or formula, please contact us with a correction.