Pace Calculator

Calculate running pace, time, or distance. Convert between min/mile and min/km, and view finish time predictions for 5K, 10K, half marathon, and marathon races.

Pace Parameters

h
m
s
miles
Quick Preset Distances:
Calculated Pace
9:00/mile

Equivalent to 5:36 /km

Forward Velocity6.7 mph • 10.7 km/h

Pace / Mile

9:00

Pace / Km

5:36

Total Time

45:00

Projected Race Finish Times

Constant Pace Model
1 Mile(1.6 km)
9:00
5K(5.0 km)
27:58
10K(10.0 km)
55:55
Half Marathon(21.1 km)
1:57:59
Marathon(42.2 km)
3:55:58

What Is a Pace Calculator?

A pace calculator determines your running, walking, or cycling speed per unit of distance (minutes per mile or minutes per kilometer) based on the relationship between three variables: pace, time, and distance. If you know any two, the calculator solves for the third. It is the essential planning tool for runners training for races, cyclists tracking performance, and fitness enthusiasts monitoring progress.

Pace & Speed Governing Formulas
Running Pace
Pace=
Total TimeDistance
Velocity (Speed)
Speed (mph)=
60 minPace (min/mi)
Step-by-Step Calculation Breakdown (10K / 6.213 Miles in 52:30)
Step 1: Convert Total Time to Pure Seconds
52 minutes 30 seconds = (52 × 60) + 30 = 3,150 total seconds
Step 2: Divide Seconds by Distance Units
Per Mile Pace = 3,150 sec ÷ 6.2137 mi = 507 sec = 8:27 min/mile
Per Km Pace = 3,150 sec ÷ 10.000 km = 315 sec = 5:15 min/km
Step 3: Calculate Equivalent Forward Velocity
Running Speed=7.10 mph (11.43 km/h)

Race Training Paces Explained

Effective running training uses different paces for different workout types. Most coaches, including Jack Daniels (author of Daniels' Running Formula), recommend these training zones:

  • Easy / Recovery Pace: 60–90 seconds slower than race pace. Used for 60–70% of weekly mileage. Builds aerobic base without excessive fatigue.
  • Tempo / Threshold Pace: A “comfortably hard” effort you could sustain for ~60 minutes. Typically 25–30 seconds per mile slower than 5K pace. Improves lactate threshold.
  • Interval Pace: Fast repetitions with recovery breaks. Improves VO₂max and running economy.
  • Marathon Pace: The steady target pace for 26.2 miles, typically 45–90 seconds slower than threshold pace.

Frequently Asked Questions

What is a good running pace for beginners?
A comfortable pace for beginner runners is typically 10:00–13:00 minutes per mile (6:15–8:05 per km). The key is running at a pace where you can hold a conversation — often called 'conversational pace.' Most running coaches recommend starting slower than you think and building speed gradually over weeks.
How do I calculate my pace from a race time?
Pace = Total Time ÷ Distance. For example, if you finished a 10K (6.21 miles) in 55 minutes: 55 ÷ 6.21 = 8:51 per mile, or 55 ÷ 10 = 5:30 per km. This calculator handles this conversion instantly.
What pace do I need to run a sub-4 hour marathon?
A sub-4 hour marathon (26.2 miles / 42.195 km) requires an average pace of 9:09 per mile or 5:41 per km. For negative-split strategy, aim for 9:15–9:20 in the first half and 8:55–9:00 in the second half.
How accurate are GPS watches for measuring pace?
GPS watches are generally accurate to within 1–3% for distance and pace on open roads with clear sky. Accuracy decreases in urban canyons (tall buildings), dense forests, and indoor tracks.
What is negative splitting and should I do it?
Negative splitting means running the second half of a race faster than the first half. It is the strategy used by most marathon world records. The benefit is that starting conservatively prevents early glycogen depletion and allows you to finish strong.
How do I convert between pace per mile and pace per km?
To convert pace per mile to pace per km, divide by 1.60934. To convert pace per km to pace per mile, multiply by 1.60934. This calculator automatically shows both units so you never need to do this conversion manually.

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