🏃 Running a 5K under 25 minutes puts you in the top 30% of recreational runners. A 2:00 half-marathon requires an average pace of 9:09/mile. Know your splits before race day — negative splitting (faster second half) is how PRs happen. Why fitness data matters →

Running Pace Calculator

Calculate your pace per km or mile, finish time, or distance with split tables

Distance
Time
Pace
Your Pace
00:00 /km

Distance

0.00 km
0.00 mi

Finish Time

00:00:00

Pace

00:00 /km
00:00 /mi

Speed

0.00 km/h
0.00 mph

Split Table

Split Lap Time Cumulative

Equivalent Race Paces

Event Predicted Time Pace /km Pace /mi

Negative Split Calculator

Plan a negative split strategy for your race. Enter your target finish time and how much faster you want the second half.

How much faster you run the second half compared to the first

First Half

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Second Half

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Negative Split Plan

km Pace /km Lap Cumulative

Common Race Pace Reference

Target paces for popular finish times. Find the min per km pace you need.

Goal Pace /km Pace /mi Speed
Sub-20 5K3:596:2615.0 km/h
Sub-25 5K4:598:0212.0 km/h
Sub-30 5K5:599:3810.0 km/h
Sub-50 10K4:598:0212.0 km/h
Sub-60 10K5:599:3810.0 km/h
Sub-1:45 Half4:588:0012.1 km/h
Sub-2:00 Half5:409:0810.6 km/h
Sub-3:30 Marathon4:588:0012.1 km/h
Sub-4:00 Marathon5:419:0910.5 km/h
Sub-4:30 Marathon6:2310:179.4 km/h

How the Running Pace Calculator Works

This pace calculator uses the fundamental relationship between three running variables: distance, time, and pace. If you know any two, the calculator finds the third. Whether you need a km pace calculator for metric distances or a min per km calculator for race planning, the math is the same:

  • Pace = Time ÷ Distance (e.g., 25 min ÷ 5 km = 5:00/km)
  • Time = Pace × Distance (e.g., 5:00/km × 10 km = 50:00)
  • Distance = Time ÷ Pace (e.g., 30:00 ÷ 6:00/km = 5 km)

All inputs are converted to a common unit (meters and seconds) for accurate calculation, then displayed in both kilometers and miles so you can use this as a running pace calculator regardless of your preferred unit system.

Understanding Race Predictions

The race predictions use Riegel's Formula, developed by Peter Riegel in 1977: T2 = T1 × (D2 ÷ D1)^1.06. This formula predicts your finish time for a target distance based on a known performance at a different distance. It accounts for the natural slowdown that occurs as race distance increases and is widely used by coaches and running apps for race pace estimation.

For the most accurate predictions, use a recent race result from a distance close to your target. A 10K time predicts half marathon pace more reliably than a 1500m time would.

Why Split Tables Matter for Race Pacing

A split table shows your target elapsed time at every kilometer or mile marker. This is essential for even pacing — the strategy behind nearly every distance running world record. Without splits, most runners start too fast, burn through glycogen early, and fade badly in the second half.

Print your split table or write key checkpoint times on your wrist. At each marker, compare your actual time to your target. If you're 10+ seconds ahead of pace in the first few km, you're probably going too fast.

Negative Splits: The Advanced Pacing Strategy

A negative split means running the second half of your race faster than the first half. This strategy works because:

  • Conserves glycogen: A slightly slower start preserves energy for the final kilometers when fatigue hits hardest
  • Reduces injury risk: Cold muscles in the first few km are more vulnerable to strain at race pace
  • Psychological advantage: Passing runners in the second half is a mental boost, while being passed late in a race is demoralizing
  • Proven at the elite level: Most marathon world records involve even or slightly negative splits

A conservative 1–2% negative split is recommended for most runners. This means if your target is a 4:00 marathon (5:41/km average), you'd run the first half at roughly 5:44/km and the second half at roughly 5:37/km.

Common Running Pace Benchmarks

Pace varies dramatically by fitness level and race distance. Here are rough benchmarks to help you contextualize your running pace calculator results:

  • Beginner 5K: 6:30–7:30/km (10:30–12:00/mi) — the conversational pace where you can talk in full sentences
  • Intermediate 10K: 5:00–6:00/km (8:00–9:40/mi) — steady effort, speaking in short phrases
  • Advanced half marathon: 4:15–5:00/km (6:50–8:00/mi) — sustained tempo effort
  • Competitive marathon: 4:00–4:30/km (6:26–7:15/mi) — Boston qualifying territory
  • Elite marathon: sub-3:00/km (sub-4:50/mi) — world-class performance
Disclaimer: Race predictions assume equivalent training for the target distance. Actual performance depends on training volume, terrain, weather conditions, nutrition strategy, and individual physiology. This pace calculator is a planning tool — not a substitute for proper race preparation.

Frequently Asked Questions

How do I calculate my running pace?
Divide your total time by the distance covered. For example, if you run 5 km in 25 minutes, your pace is 25 ÷ 5 = 5:00 per km (or about 8:03 per mile). This pace calculator handles the conversion automatically — enter your distance and time, and it returns your pace in both min/km and min/mi.
What is a good running pace for beginners?
Most beginners run between 6:00–7:30 per km (9:40–12:00 per mile). A comfortable beginner 5K pace is around 6:30–7:00/km, which translates to a finish time of roughly 32–35 minutes. The key is to run at a pace where you can hold a conversation — this builds your aerobic base without risking injury.
How do I convert pace from min/km to min/mile?
Multiply your min/km pace by 1.60934 to get min/mile. For example, 5:00/km × 1.60934 = 8:03/mi. To go the other way, divide your min/mile pace by 1.60934. This calculator shows both units automatically so you never need to convert manually.
What is a negative split in running?
A negative split means running the second half of a race faster than the first half. For example, running the first half of a marathon in 1:55 and the second half in 1:50. This strategy helps conserve glycogen early and finish strong. Most marathon world records have been set with negative or even splits.
How accurate are race time predictions?
Race predictions use Riegel's Formula (T2 = T1 × (D2/D1)^1.06), which is accurate within about 3–5% for trained runners stepping up one race distance. Accuracy decreases for large distance jumps (e.g., 5K to marathon) because the formula assumes equivalent training for the target distance. Factors like heat, hills, and nutrition also affect real-world results.
What pace do I need to run a sub-4-hour marathon?
To finish a marathon under 4 hours, you need to average 5:41/km (9:09/mi) or faster. That means hitting every kilometer split at or under 5:41. Most coaches recommend training at a slightly faster pace — around 5:30/km — to build a buffer for the inevitable slowdown in the final 10 km.
How do split tables help with race pacing?
Split tables show your target time at every kilometer or mile marker during a race. They prevent the most common pacing mistake — starting too fast and fading in the second half. Print your split table or write key splits on your arm so you can check your progress at each marker and adjust your effort accordingly.

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Running Training Plan: From Couch to Race Day

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