About the Pace Calculator

Whether you're training for your first 5K or trying to qualify for the Boston Marathon, understanding your pace is fundamental to structured training. Our Pace Calculator solves for any one of three variables — pace, distance, or time — when you know the other two. It also projects your finish time at your current pace for popular race distances.

Simply enter what you know, and the calculator fills in the rest. Convert between minutes per mile, minutes per kilometer, and km/h or mph instantly.

How It Works

Enter any two of: pace (min/mile or min/km), distance (miles, km, or a standard race distance), and time (hours, minutes, seconds). The calculator solves for the third. Race finish time projections assume a constant pace across the full distance.

Formula / Key Reference

Pace = Time ÷ Distance
Time = Pace × Distance
Distance = Time ÷ Pace

Unit conversions:

1 mile = 1.60934 km

Speed (mph) = 60 ÷ Pace (min/mile)
Speed (km/h) = 60 ÷ Pace (min/km)

Real-World Example

Runner: completed a 10K in 52 minutes flat

Pace = 52 min ÷ 10 km = 5:12 min/km (or 8:22 min/mile)
Speed = 60 ÷ 5.2 = 11.54 km/h

Projected race finish times at this pace:

5K: 26:00

10K: 52:00

Half marathon (21.1 km): 1:49:44

Marathon (42.2 km): 3:39:28

To achieve a sub-50 minute 10K:

Required pace = 50 ÷ 10 = 5:00 min/km

Need to improve by 12 seconds per kilometer — about 2.3% faster.

Common Uses

  • Calculating your finish time for 5K, 10K, half marathon, or marathon
  • Determining what pace to run in training for a target race time
  • Converting between min/mile and min/km for international race references
  • Setting pace targets for each mile or kilometer segment of a race
  • Tracking pace improvements over weeks and months of training

Frequently Asked Questions

What is a good pace for a beginner runner? ▼
Most beginner runners complete a mile in 10–14 minutes (6:12–8:42 min/km). A comfortable conversational pace is the right intensity for easy training runs. As fitness improves over weeks of consistent training, pace naturally improves. Don't compare yourself to experienced runners — your only competition is your previous self.
What is negative splitting? ▼
Negative splitting means running the second half of a race faster than the first half. Elite distance runners almost universally run negative splits in record-breaking performances because starting conservatively preserves glycogen for the end. Most amateur runners do the opposite (go out too fast) and slow down in the back half.
How do I convert pace to speed? ▼
Divide 60 by your pace in minutes per mile to get mph. For example, a 8:00/mile pace = 60 ÷ 8 = 7.5 mph. For km/h, divide 60 by your pace in min/km: a 5:00/km pace = 60 ÷ 5 = 12 km/h. Our calculator performs this conversion automatically.
What are training pace zones? ▼
Most training programs define 5–7 pace zones based on a percentage of maximum heart rate or race pace. Easy runs (Zone 2) are at about 65–75% effort; threshold runs (Zone 4) are at 80–90% effort; intervals (Zone 5) are at near-maximum effort. Easy runs should make up 80% of total mileage in most plans.