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Running Pace Calculator: Calculate Your Running Pace

Convert between distance, time, and pace for any run

HealthBy Numora health teamReviewed by Numora medical review board, Certified Running CoachUpdated 

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Assumptions
Pace (min per unit)
Enter your values

Fill in the 4 fields above to see your result.

Projected race times assume you can hold pace across the full distance. In reality, pace falls off at longer distances — typical slowdown is about 5–10% from 5K to marathon for recreational runners.

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⚡ The answer

A pace calculator converts a run's total time and distance into a pace — the average time per mile or per kilometer — plus a predicted finish time at standard race distances. Dividing total seconds by distance is simple; projecting across distances is approximate because runners slow down as races get longer.

Quick takeaway

This running pace calculator helps you determine your average pace in minutes per mile or per kilometer by inputting your total distance and elapsed time. It also provides projected finish times for common race distances such as 5K, 10K, half marathon, and full marathon, serving as a valuable tool for runners of all levels. Use it to benchmark training workouts, understand your fitness progression, and set realistic race goals, offering a quick and reliable way to analyze performance and plan future efforts.

What is a running pace?

Use this comprehensive pace calculator to effortlessly convert between running pace (minutes per mile or per kilometer), total distance covered, and elapsed time. Enter any two of these variables – for instance, your 5K finish time and the race distance – and our tool will compute your average pace, provide mile or kilometer splits, and project equivalent finish times for other common race distances like the 10K, half marathon, and full marathon. This calculator is an invaluable resource for runners of all levels, from beginners planning their first 5K to seasoned marathoners fine-tuning their race-day pacing strategy. It's also excellent for benchmarking training workouts, understanding your fitness progression, and setting realistic race goals. While the core math relies on straightforward unit-rate arithmetic, similar to what coaches and GPS watches use, it offers a quick and reliable way to analyze your running performance and plan future efforts.

The formula

pace (sec per unit) = total seconds ÷ distance
  • pace — seconds per mile or kilometer
  • total seconds — hours×3600 + minutes×60 + seconds
  • distance — total miles or kilometers run

Source: Basic Unit Rate Calculation and Linear Projection.

Worked examples

1A 5 mile run in 45 minutes

Inputs
distance: 5unit: 1hours: 0minutes: 45seconds: 0
Walkthrough

Five miles in 45 minutes works out to 9:00/mile, about 6.67 mph. At that effort, a 5K would take roughly 27:58, a 10K about 55:56, and a marathon 3:55:57 — though the marathon figure is optimistic for anyone who hasn't trained specifically for the distance.

2A 10K in 50 minutes

Inputs
distance: 10unit: 2hours: 0minutes: 50seconds: 0
Walkthrough

Ten kilometers in 50:00 is 5:00/km pace — a common benchmark for intermediate runners. Equivalent linear projections: 5K in 25:00, half marathon in 1:45:30, marathon in 3:30:58.

3A half marathon in 1 hour 50 minutes

Inputs
distance: 13.1unit: 1hours: 1minutes: 50seconds: 0
Walkthrough

Completing a half marathon (13.1 miles) in 1 hour and 50 minutes results in an average pace of approximately 8:23 per mile, or 5:13 per kilometer. This pace linearly projects to a 5K time of about 26:02, a 10K time of 52:04, and a full marathon time of 3:40:00. These projections serve as a useful guide for training and race planning.

How to use this calculator

  1. Distance
  2. Distance unit (default: 1)
  3. Hours
  4. Minutes
  5. Seconds
  6. Read the result. Use the worked examples below to sanity-check against a known scenario.

Common mistakes and edge cases

Reading linear projections as guarantees. A 7:00/mile 5K does not automatically translate to a 3:04 marathon. Recreational runners typically slow 5–15% from 5K to marathon; elite runners slow closer to 5%.

Mixing units mid-plan. A 5:00/km pace is not the same as 5:00/mile. Pick one and stick with it — your watch and your training plan should agree.

Tracking pace without tracking effort. Two runs at identical pace can feel completely different depending on hills, heat, and rest. Heart rate or perceived effort belong alongside pace in any training log.

Frequently asked questions

Why are my race projections different from my watch's?
Watches often use Riegel's formula (T2 = T1 × (D2/D1)^1.06), which accounts for fatigue at longer distances. This calculator projects linearly, which overestimates your marathon pace and underestimates your 5K pace slightly.
What's a good pace?
There's no universal 'good' — it depends on age, training, and goals. A sub-20 5K (6:26/mile) puts a recreational runner in the top 10% of their age group. Training plans use percentages of race pace, not absolute numbers.
How do I pace myself in a race?
Even splits or a slight negative split (second half faster than first). Starting too fast is the single most common pacing mistake; aim for the first mile 10–15 seconds slower than goal pace, then settle in.
How does altitude affect running pace?
Running at higher altitudes reduces the oxygen available to your muscles, leading to a slower pace for the same perceived effort. For every 1,000 feet (300 meters) above sea level, your pace can slow by 1-2% for endurance efforts. Acclimatization over several weeks can mitigate some of this effect.
What's the difference between pace and speed?
Pace measures time per unit of distance (e.g., minutes per mile or kilometer), while speed measures distance per unit of time (e.g., miles per hour or kilometers per hour). They are reciprocals of each other; a faster pace means less time per unit distance, which corresponds to higher speed.
How can I improve my running pace?
Improving pace typically involves a combination of consistent training, incorporating speed work (intervals, tempo runs, fartleks), building endurance with long runs, strength training, and proper recovery. Gradually increasing your weekly mileage and varying your workouts are key strategies.
Should I train by pace or heart rate?
Both pace and heart rate are valuable training metrics. Pace is great for specific race goals and flat terrain, but it doesn't account for external factors like hills, heat, or fatigue. Heart rate training reflects your physiological effort, making it more consistent across varying conditions. Many runners use a combination of both, using heart rate for effort control and pace for specific speed work.
What is a negative split?
A negative split occurs when you run the second half of a race or a specific workout segment faster than the first half. It's often considered an ideal race strategy, especially for longer distances, as it demonstrates efficient energy management and a strong finish.

Running Pace glossary

Pace
Average time per unit of distance. Runners usually talk in min/km or min/mile; swimmers in min/100 meters.
Splits
Times for individual segments of a run — kilometer splits, mile splits, lap splits. 'Even splits' means running each segment in the same time.
Race equivalency
The idea that performance at one distance predicts another. Real-world equivalency curves (like Riegel's) bend slightly — longer races are disproportionately slower.
Negative Split
Running the second half of a race or workout faster than the first half. Often considered an optimal race strategy for endurance events.
Fartlek
A Swedish term meaning 'speed play,' Fartlek training involves continuous running with varying speeds and intensities, often unstructured and dictated by how the runner feels.
Tempo Run
A sustained effort run at a comfortably hard pace, typically lasting 20-60 minutes. It's designed to improve lactate threshold and endurance.

How we built this calculator

Methodology

Pace is a simple rate: total time divided by total distance. The output is usually expressed in minutes per mile or per kilometer because that's how training plans prescribe effort. Speed (miles per hour) is the reciprocal.

This calculator was written by Numora health team and reviewed by Numora medical review board, Certified Running Coach before publication. Both names link to full bios with verifiable credentials.

Formula source
Basic Unit Rate Calculation and Linear Projection
Last reviewed
2026-04-24
Reviewer
Numora medical review board, Certified Running Coach
Calculation runs
Client-side only
NH
WRITTEN BY
Numora health team
NM
REVIEWED AND APPROVED BY
Numora medical review board, Certified Running Coach
In this review:
  • Verified the formula matches Basic Unit Rate Calculation and Linear Projection (1.0).
  • Confirmed the rounding rule applied by the engine: Pace to 2 decimal places; projected times to nearest second.
  • Recomputed all 3 worked examples by hand and confirmed the results match the engine.
  • Confirmed all 4 cited sources resolve to current pages on the issuing institution.
  • Validated all 2 test cases pass within the declared tolerance.

Reviewed on 2026-04-24 · Next review: 2027-04-24

See editorial policy

Sources & references

Every numeric assumption traces to a primary source.

  1. https://worldathletics.org/records/by-category/world-recordsINT
  2. https://www.acsm.org/read-research/acsm-journalsUSA
  3. https://www.tandfonline.com/journals/rjss20INT
  4. https://www.rrca.org/education/for-coachesUSA
  5. Numora Editorial Policy. numora.net/editorial-policy