What pace do I need to run a sub-4-hour marathon?

A marathon is 26.2188 miles or 42.195 km. To finish in exactly 4 hours (240 minutes), you need an average pace of 240 ÷ 26.2188 = 9:09 per mile, or 240 ÷ 42.195 = 5:41 per kilometre. Running at exactly this pace, you finish in 4:00:00. Most runners aim slightly faster to allow for slowdown in the final miles.

What is a good running pace for beginners?

A comfortable conversational pace for most beginners is between 10:00 and 14:00 per mile (6:12 to 8:42 per kilometre). At this pace you should be able to speak in full sentences. Most beginners complete a 5K in 30 to 45 minutes (9:39 to 14:31 per mile). The goal for new runners is consistency and building a base, not speed. Heart rate should stay at 60 to 75% of maximum heart rate during easy runs.

What is the difference between pace and speed?

Pace is expressed as time per unit distance (minutes per mile or km). Speed is distance per unit time (miles per hour or km/h). They describe the same movement from opposite directions. To convert: speed (mph) = 60 ÷ pace (min/mile). A 10:00/mile pace = 6.0 mph. A 8:00/mile pace = 7.5 mph. Runners typically use pace; cyclists and general audiences typically use speed.

Pace Calculator 2026 - Running Pace, Time, Distance & Split Table

Pace Calculator

Solve for pace, time, or distance. Select which variable to calculate and enter the other two.

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Pace Converter

Convert any pace or speed between eight units instantly.

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Finish Time Projector

Project your finish time based on current position and elapsed time in a race.

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Full Race Distance

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Multipoint Lap Calculator

Enter distance and time for each segment. Calculates per-segment pace and cumulative time. Highlights your fastest and slowest segments.

Dist Unit Time (mm:ss) Pace /km

World Record Paces

Official world record paces for major track and road distances as of 2026.

Distance	Men WR Pace	Women WR Pace

Pace, Speed, and Distance Formulas

Pace, time, and distance form a closed triangle - knowing any two values determines the third.

Pace = Time ÷ Distance Time = Pace × Distance Distance = Time ÷ Pace Example: 45 min run at 5:00/km pace Distance = 45 ÷ 5 = 9.0 km

Converting Pace to Speed

Speed (km/h) = 60 ÷ Pace (min/km) Speed (mph) = 60 ÷ Pace (min/mile) Example: 5:00/km = 60÷5 = 12.0 km/h Example: 8:00/mile = 60÷8 = 7.5 mph

Converting Between Pace Units

min/mile to min/km: multiply by 0.621371 min/km to min/mile: multiply by 1.60934 Example: 9:00/mile = 9 × 0.6214 = 5:35/km Example: 5:00/km = 5 × 1.6093 = 8:03/mile

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A common race-day mistake is confusing pace and speed units. GPS watches often allow switching between min/km and min/mile. Verify your watch settings before a race to avoid accidentally running your marathon at 5:00/mile (a sub-2:11 marathon pace) when you meant 5:00/km (a 3:30 marathon).

Common Race Distances

Race	Distance (km)	Distance (miles)	3:30 Marathon Equiv.
800m	0.8	0.497	1:39
1,500m	1.5	0.932	3:06
1 Mile	1.609	1.0	3:20
5K	5.0	3.107	24:44
10K	10.0	6.214	49:28
10 Miles	16.093	10.0	1:19:41
Half Marathon	21.098	13.109	1:45:00
Marathon	42.195	26.219	3:30:00
50K Ultra	50.0	31.07	4:09:18

The 3:30 marathon equivalent pace is 4:58/km (7:59/mile). Each row shows the expected finish time at that pace, useful for understanding relative performance across distances.

Heart Rate Training Zones and Pace

Heart rate and pace are closely correlated: faster pace demands more oxygen, which increases heart rate. Training at different percentages of maximum heart rate (MHR) targets different physiological adaptations. MHR is commonly estimated as 220 minus age, though this formula has significant individual variation.

Zone 1

50 to 60%

Recovery. Very easy. Active rest, warmup, cooldown. Burns mainly fat.

Zone 2

60 to 70%

Base aerobic. Conversational. Builds endurance base. Fat burning peak.

Zone 3

70 to 80%

Aerobic. Tempo pace. Builds cardio efficiency. Slightly uncomfortable.

Zone 4

80 to 90%

Lactate threshold. Hard. Sustainable 20 to 40 min. Raises threshold.

Zone 5

90 to 100%

Anaerobic. Maximum effort. Short intervals only. VO2max development.

Aerobic vs Anaerobic Threshold

The aerobic threshold is the pace at which the body transitions from using primarily fat as fuel to burning more carbohydrates. It corresponds roughly to Zone 2 to 3 intensity (60 to 75% MHR). Most endurance training should be done at or below this threshold to build the aerobic base without excessive fatigue.

The lactate threshold (also called anaerobic threshold) is the pace at which lactate begins to accumulate in the bloodstream faster than it can be cleared. This corresponds to Zone 4 intensity (80 to 90% MHR). Training at or just below the lactate threshold (tempo runs) raises this threshold over time, allowing you to sustain faster paces before lactate accumulates.

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For marathon training, most coaches recommend building around 80% of weekly volume in Zone 1 to 2 (easy, conversational pace) and only 20% in Zone 3 to 5 (tempo, interval, and speed work). This polarized approach builds the aerobic base that sustains marathon pace for 26.2 miles while avoiding accumulated fatigue from excessive hard efforts.

Aerobic Threshold Pace Estimation

A practical field test: run at a pace where you can speak in full sentences but feel some effort. This is close to your aerobic threshold. If you can only say 2 to 3 words before needing a breath, you are above your lactate threshold. The Maffetone Method uses MHR = 180 minus age as the ceiling for aerobic base training, which is more conservative than the standard formula.

Pace for Common Race Goals

Race Goal	Required Pace (min/km)	Required Pace (min/mile)
5K in 20:00	4:00/km	6:26/mile
5K in 25:00	5:00/km	8:03/mile
5K in 30:00	6:00/km	9:39/mile
10K in 40:00	4:00/km	6:26/mile
10K in 50:00	5:00/km	8:03/mile
10K in 60:00	6:00/km	9:39/mile
Half Marathon in 1:45:00	4:59/km	8:01/mile
Half Marathon in 2:00:00	5:41/km	9:09/mile
Marathon in 3:00:00	4:16/km	6:52/mile
Marathon in 3:30:00	4:58/km	7:59/mile
Marathon in 4:00:00	5:41/km	9:09/mile
Marathon in 4:30:00	6:24/km	10:18/mile
Marathon in 5:00:00	7:06/km	11:27/mile

Frequently Asked Questions

How do you calculate running pace?

Pace equals time divided by distance. Run 5 km in 25 minutes: pace = 25 ÷ 5 = 5:00 per km. Run 3 miles in 27 minutes: pace = 27 ÷ 3 = 9:00 per mile. To convert to speed in km/h, divide 60 by your min/km pace. 5:00/km gives 60 ÷ 5 = 12 km/h.

What pace do I need for a sub-2-hour half marathon?

A half marathon is 21.0975 km or 13.1094 miles. To finish in exactly 2 hours (120 minutes): 120 ÷ 21.0975 = 5:41 per km, or 120 ÷ 13.1094 = 9:09 per mile. To allow for variation in effort, most runners training for a 2-hour half aim for training runs at 5:30 to 5:40 per km.

Why do my GPS pace readings fluctuate so much?

GPS pace is calculated from position changes over very short time intervals. Small positioning errors compound into large pace swings when the interval is short. Most GPS watches average pace over 5 to 30 seconds to reduce this. Running under trees, near tall buildings, or in canyons reduces satellite signal quality and increases fluctuation. Average pace over the full run is always more accurate than instantaneous pace from GPS alone.

What is negative splitting in running?

Negative splitting means running the second half of a race faster than the first half. Most world records at distances of 1,500m and beyond are set with negative or even splits. It requires conservative pacing in the first half, which feels too easy early on. Most recreational runners positive split (slow down late in the race), which is both common and preventable with disciplined early pacing.