2026-09-16 9 min

Long Run Pace Calculator

Set long-run pace from marathon goal time: required pace, aerobic long-run band, speed equivalents and a 0-100 session score.

Calculator

Goal Distance km

Goal Time min

Body Weight kg

Results update live as you type

Status:Goal 5:41/km (9:09/mi)Long run 6:41/kmScore 93/100

Long Run Pace Calculator Results

Session Score93/100

Required Pace5:41/km (9:09/mi)

Long-Run Pace6:41/km (10:46/mi)

Speed10.5 km/h (6.6 mph)

Goal Time4:00:00

Est. Calories2,800 kcal

Train long runs near 6:41 per km (10:46 per mile).

Even-Split Breakdown

Split	Time	Pace (/km)
First third	1:20:00	5:41
Middle third	1:20:00	5:41
Final third	1:20:00	5:41

Recommendations

▸At or above reference pace — protect recovery with easy days between hard ones
▸Efforts over an hour need fueling: 30-60 g carbs per hour plus fluids
▸Hold even thirds near 5:41 per km for the most efficient finish
▸Train long runs near 6:41 per km (10:46 per mile).

Results

Optimal

Session Score

93/100

Volume (40) + duration (30) + intensity (30)

Required Pace

5:41/km

Goal time divided by goal distance

Required Pace (mi)

9:09/mi

Imperial equivalent of required pace

Long-Run Pace

6:41/km

Aerobic long-run pace, ~60 s/km slower than goal marathon pace

Speed

10.5 km/h

60 divided by required pace

Est. Calories

2,800 kcal

MET-based energy estimate

Pace is exact arithmetic on your inputs (time / distance) with speed and calorie equivalents. Hills, wind and stops add variation around this steady-state ideal.

Visualizations

Goal vs Long run Pace (sec/km)

341 s/kmGoal

401 s/kmLong run

Time by Third

First third33%

Middle third33%

Final third33%

Session Score

Score93/100

Formula

Divides goal time by goal distance, then shifts into the long run band for marathon distance.

Pace = goal time / goal distance

Alternative Form

Speed = 60 / pace; Long run pace = goal pace + 60 s/km

Variables

Symbol	Name	Unit	Description
t	Goal time	min	Target finish time
d	Goal distance	km	Marathon distance
p	Required pace	min/km	Time per kilometer to hit the goal
v	Speed	km/h	60 divided by required pace
T	Long-Run Pace	min/km	Aerobic long-run pace, ~60 s/km slower than goal marathon pace
Score	Session score	0-100	Volume, duration and intensity

Explanation

Pace inverts speed: halving the pace number doubles the speed. The long run band shifts goal pace by a fixed, documented offset so training lands in the right zone.

Derivation

p(min/km) = t(min)/d(km). Long run = p + 60 s/km. Score = min(100, vol + dur + inten) against the reference.

Step-by-Step Calculation

Follow each step to understand how the result is calculated from your inputs.

Step 1

Divide goal time by goal distance for required pace.

Pace = time / distance

Time:4:00:00

Distance:42.2 km

Intermediate: 240 / 42.2

Result: 5:41 min/km

Step 2

Convert required pace to per-mile.

Pace/mi = pace/km x 1.609344

PaceKm:5:41

Intermediate: 5:41 x 1.609344

Result: 9:09 min/mi

Step 3

Invert pace into running speed.

Speed = 60 / pace

Pace:5:41/km

Intermediate: 60 / 5.69

Result: 10.5 km/h (6.6 mph)

Step 4

Shift goal pace into the long-run band.

Long pace = goal + 60 s/km

GoalPace:5:41/km

Intermediate: +60 s/km offset

Result: Long-Run Pace 6:41/km

Step 5

Estimate energy with the MET equation.

Calories = MET x kg x hours

MET:10

Intermediate: 10 x weight x 4.00

Result: 2,800 kcal

Step 6

Score volume, duration and intensity 0-100.

Score = min(100, vol + dur + inten)

Pace:5:41/km

Intermediate: volume + duration + intensity

Result: Session score = 93/100

Final Answer

93/100

Worked Examples

See how the calculator works with different scenarios.

Scenario

Targeting 42.195 km in 240 minutes.

Inputs

Distance:42.195 km

Time:240 min

Calculation

Pace = 240 / 42.195 = 5:41 min/km

Result

5:41 min/km (10.5 km/h)

Interpretation

Hold this evenly; even thirds race fastest.

Understanding Your Result

Your Result: Session Score: 93/100

Typical range: Reference intensity sits near 6 min/km; within 30% either way is normal training territory.

What This Means

The required pace shows how many minutes each kilometer must take on average; the long run pace (6:41/km) is where training for it happens.

Why It Matters

Pace anchors training zones and race plans — most endurance gains come from accumulating volume near these numbers.

Professional Interpretation

Coaches prescribe 80% of volume easier than reference and 20% at or above it. Even pacing beats surging.

Why two paces are shown

Goal pace is race-day execution; the long run band (60s/km offset) is the daily training address that builds it.

Average hides variation

Identical averages can feel very different; check the thirds table for drift.

Recommendations

•Hold even thirds at goal pace
•Do 80% of volume at or below the training band
•Re-test every 4-8 weeks
•Adjust for hills and heat
•Fuel efforts over 60 minutes

Educational Content

Introduction

The Long Run Pace Calculator turns a goal distance and finish time into the exact pace you must hold, plus the training band that builds it.

Concept Explanation

Pace equals time divided by distance; speed is its reciprocal. The long run offset shifts goal pace by 60 seconds per km so sessions land in the right physiological zone.

Applications

▸Setting race goal pace from fitness

▸Converting training plans across units

▸Checking splits mid-race

▸Comparing courses and conditions

▸Sizing weekly mileage progression

▸Planning fuel and hydration by duration

Benefits

•Instant pace, speed and time equivalents
•Both metric and imperial outputs
•A 0-100 session score for tracking
•Split-table detail for execution
•What-if planning before race day

Limitations

•Assumes steady effort throughout
•Ignores hills, wind and stops
•Short sprints need anaerobic context
•Predictions degrade beyond 2x tested distance

Best Practices

•Test on flat calm courses
•Keep conditions similar between tests
•Round goals to sustainable paces
•Re-test every 4-8 weeks
•Start races slightly conservatively

Common Misconceptions

Myth: Average pace tells the whole story.

Truth: Variability hides in averages. Even splits with the same average usually race faster and feel easier.

Myth: Faster always means fitter.

Truth: Conditions swing pace several percent. Compare only similar courses, weather and fatigue.

Myth: Beginners should chase pace.

Truth: Effort and consistency first; pace targets work once a base routine exists.

Practical Tips

•Test on a flat calm course for comparability
•Keep conditions similar between tests
•Round goals to sustainable paces
•Re-test every 4-8 weeks
•Start races slightly conservatively
•Log splits, not just averages

Common Mistakes

Starting too fast

Run the first third slightly easier than goal; even or negative splits race fastest.

Ignoring unit conversions

Confirm km vs miles before goal-setting; one mile equals 1.609344 km.

Testing on different courses

Reuse one flat measured route so hills do not masquerade as fitness changes.

Chasing pace in bad weather

Slow goals 1-3% per 5 degrees above 15C and accept wind-adjusted efforts.

Raising volume and intensity together

Change one variable at a time and hold 2-3 weeks before progressing.

Trusting single best splits

Use repeatable paces across full sessions, not one downhill kilometer.

Assumptions

This calculator makes the following assumptions to provide estimates:

Steady effort: Math assumes even pacing without stops, hills or wind.

Measured course: Distance input reflects the true course length.

Consistent units: Conversions use 1 mi = 1.609344 km exactly.

Aerobic context: Best for efforts over 3 minutes; sprints need anaerobic models.

Adult athlete: Guidance fits typical adult training; youth pacing differs.

Limitations

Be aware of these limitations when using this calculator:

Terrain ignored: Hills, trail surface and altitude shift real pace versus ideal.

Weather ignored: Heat, humidity, wind and cold change sustainable pace.

Fatigue ignored: Cumulative training load slows real sessions versus fresh tests.

No drafting effects: Pack running and wind shelter change real energy cost.

Prediction decay: Extrapolating far beyond tested distance widens error quickly.

Frequently Asked Questions

Answers to common questions about this calculator.

How should I use the long run pace calculator in training?

Enter the marathon goal, then run weekly long runs inside the green long-run band.

What is the biggest mistake with long run pace calculator goals?

Racing long runs at goal pace — the classic marathon-build error that peaks athletes in training.

How do I adjust the long run pace calculator for hills?

Add 20-60 seconds per km per 5% grade to the computed pace, or run the hilly section by effort and let pace float.

Can beginners use the long run pace calculator?

Yes. Walk-run intervals count fully — enter total elapsed moving time and total distance for an honest average.

How often should goals change?

Re-test every 4-8 weeks. When the same effort yields 1-3% faster pace, update goals rather than forcing old ones.

Why does my watch disagree?

GPS smoothing, auto-pause settings and course measurement differ 1-3%. Trust measured courses over wrist totals for goal-setting.

What does the long run pace calculator do?

It converts a goal distance and finish time into the exact pace and speed you must hold, plus a recommended training band so every session has a concrete target.

What units can I use?

Metric and imperial together. Enter distance in kilometers; pace is shown per kilometer and per mile, with speed in both km/h and mph.

How is pace different from speed?

Pace is time per distance (min/km) and speed is distance per time (km/h). They are reciprocals: speed equals 60 divided by pace in min/km.

How do I convert min/mile to min/km?

Divide by 1.609344. An 8:00 min/mile is about 4:58 min/km. This calculator shows both automatically.

How accurate is the pace math?

The arithmetic is exact for steady efforts. Real sessions vary with hills, wind, fatigue and stops, so treat the output as the ideal steady-state equivalent.

Can I use it for race planning?

Yes. Enter goal distance and target time to get required pace, then train with the recommended band 5-10% around it in interval sessions.

Why do pace and speed both matter?

Runners think in pace while treadmills and GPS watches often display speed. Showing both keeps devices, plans and race goals consistent.

How do hills affect the numbers?

Uphill running slows pace roughly 20-60 seconds per km per 5% grade; downhill returns only part of it. Slow hilly-course goals accordingly.

What is a good pace?

It depends on fitness and distance. Conversational effort suits most base training; tempo effort is comfortably hard and sustainable under an hour.

Should beginners chase pace?

Effort and consistency come first; pace targets work best once a regular routine exists. Walk-run intervals count fully.

How often should I test my pace?

Every 4-8 weeks on the same course in similar conditions. Improvements of 1-3% per cycle are excellent for trained runners.

Does weather change the result?

Heat, humidity, altitude and headwinds slow real-world pace versus the calculator ideal. Slow goals 1-3% per 5 degrees above 15C.

Related Calculators

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Related Guides

Deepen your understanding with these educational resources.

Getting Started with Cardio Training

Build safe weekly volume from walking to intervals.

Strength Training Basics

Pair resistance work with your running sessions.

Nutrition for Active People

Fuel training and recover without guesswork.

Understanding TDEE and Energy Balance

Place exercise inside total daily expenditure.

Glossary

Technical terms used in mortgage calculations explained in plain language.

Pace: Time per unit distance, usually min/km or min/mi.
Speed: Distance per unit time, usually km/h or mph.
Split: Time for one segment of a session or race.
Negative split: Second half faster than the first; usually the fastest pacing strategy.
Tempo: Comfortably hard effort sustainable under about one hour.
Interval: A hard repeat separated by recovery periods.
Fartlek: Unstructured speed play alternating fast and easy running.
Cadence: Steps per minute while running; most trained runners use 170-180.
Aerobic threshold: Top of easy Zone 2 effort; the conversational pace boundary.
VO2 max: Maximum oxygen uptake; the ceiling of aerobic power.
Lactate threshold: Intensity where lactate accumulates; near one-hour race effort.
Taper: Reduced training before a race to arrive fresh.

Authoritative References

Trusted sources and standards referenced by this calculator.

ACSM — Exercise guidance and resources CDC — Physical activity guidelines American Heart Association — Fitness resources WHO — Physical activity fact sheets NIH — Exercise and health information Ainsworth et al. — Compendium of Physical Activities AtlasCalcs — Health resources

Applicable Standards

ACSM Guidelines for Exercise Testing and PrescriptionCompendium of Physical Activities MET valuesWHO physical activity recommendations (150-300 min/week moderate activity)

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Page Information

Last Updated:

2026-09-16

Version:

2.0.0

References:

License:

Free to use for educational and professional purposes.