Pace Calculator | Run Pace, Time & Distance

World record pace reference compared to your pace
Dist	Men	Women	You
100 m	2:34 / mi	2:49 / mi	6:00 / mi
400 m	2:53 / mi	3:12 / mi	6:00 / mi
1 km	3:32 / mi	3:60 / mi	6:00 / mi
1 mile	3:43 / mi	4:12 / mi	6:00 / mi
5K	4:03 / mi	4:31 / mi	6:00 / mi
10K	4:13 / mi	4:40 / mi	6:00 / mi
Half	4:23 / mi	4:55 / mi	6:00 / mi
Marathon	4:36 / mi	5:07 / mi	6:00 / mi

Reading pace, time, and splits

The first card walks through default inputs; the others cover finish-time mode, lap splits, and the world-record reference.

Example: 5 miles in 30:00 (Solve for Pace)

Leave Solve for Pace selected, Per Mile active, distance 5, time 0:30:00. Section 02 shows average pace 6:00/mi. The At this pace table lists projected 5K (~18:38), 10K, half, and marathon totals at that same effort.

Solve for Time: 4-hour marathon pace

Choose Solve for Time, tap Marathon, and enter pace 9:09/mi (9 min, 9 sec). Section 02 shows about 4:00:00 finish time. At 9:10/mi the same distance returns about 4:00:20.

Segment pace panel (section 01)

After a track or GPS lap, enter lap distance and minutes/seconds, then Add. Mile 1 at 8:00 and mile 2 at 9:30 on the same course flags a positive split. Clear wipes the list before the next workout.

WR pace reference (section 02)

The table repeats your average pace beside approximate record paces at each distance. Use it to sanity-check goals, not to set workout intensity. Heart-rate zones for those efforts live on the Target Heart Rate Calculator.

Pace calculator: running pace, time, and distance

Solve Pace = Time ÷ Distance for min/mile or min/km, project 5K–marathon finish times, log segment splits, and compare to world-record paces. Assumes constant effort; runs locally.

What this calculator does

Computes the missing variable from pace, elapsed time, and distance. Section 01 has unit toggles, Solve for mode, race preset buttons (5K–marathon), and optional segment logging. Section 02 shows the primary result, At this pace projections, and a WR pace reference table. Supports miles, kilometers, meters, and yards with unit conversion. Does not model hills, fatigue, or negative splits; not for cycling speed.

How the Math Works

All three forms come from one relationship:

Pace = Time ÷ Distance

Time = Pace × Distance gives finish time at a steady split. Distance = Time ÷ Pace gives how far you covered in a known clock time. Internally, hours/minutes/seconds become total seconds before division, then results format back to h:mm:ss or min:sec. Worked example: 5 km in 25:00 → pace 5:00/km (1,500 s ÷ 5). Goal 4:00 marathon in km units: 240 min ÷ 42.195 km ≈ 5:41/km (about 9:09/mi). Segment rows use the same formula per lap: lap time ÷ lap distance.

Mid-run checks and segment pacing

During a race, use Solve for Pace with distance covered and elapsed time, then check whether At this pace still hits your goal. Segment logging catches local fades: a mile 45 s slower than the prior split often means you started hot or under-fueled, even when the overall average looks fine.

Pace Calculator FAQ

How does this page calculate running pace?

Pick Solve for Pace in section 01, enter elapsed time (H, M, S) and distance in your active unit. The page applies Pace = Time ÷ Distance and shows min:sec per mile, km, meter, or yard on the Results card in section 02.

How do I find finish time from a target pace?

Set Solve for Time, enter your pace (min and sec per unit) and distance. The dark Results card shows total finish time. A 5K preset at 10:00/mi returns about 31:04 because 3.11 mi × 10 min/mi ≈ 31 minutes.

What does the At this pace table show?

When section 02 has a valid average pace, At this pace lists projected finish times for 5K, 10K, Half Marathon, and Marathon if you held that split. Hills, heat, and late-race fade are not modeled.

How do I log segment or lap pace?

In the Segment pace box (section 01), enter lap distance and time, then Add (up to 12 splits). Each row shows pace for that lap only, separate from the overall Results average.

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

Tap Per Kilometer under pace/distance unit. Distance and pace displays rescale together (1 mi ≈ 1.60934 km). Example: 8:00/mi becomes about 4:58/km without retyping the workout.

What is the WR pace reference table?

Section 02 compares your current average pace to approximate men's and women's world-record paces from 100 m through marathon. It is context, not a training target. A solid age-group 5K can still be roughly 2× the men's record pace.

Can I use this for cycling?

This page is built for time per distance (running and walking). Cyclists usually work in speed (mph or km/h). You can convert running pace to speed mentally (e.g. 9:00/mi ≈ 6.7 mph), but bike gearing and drafting are not modeled here.

Sources & citations

References used for the calculation method and definitions. Links open in a new tab when available.

[1]

World Athletics — World Records

Official outdoor record marks used as approximate benchmarks in the WR pace reference table.

Fitness Reference Note

Informational Use: These calculations (BMI, Calories, etc.) are based on standard statistical formulas and are intended for general reference and goal-setting purposes only.

Consult Experts: This tool does not provide medical advice, diagnosis, or treatment. Results may not be accurate for athletes, pregnant individuals, or those with underlying health conditions.

Health Safety: Always consult with a healthcare professional or qualified trainer before beginning any new diet or intensive exercise program.

Privacy First: All calculations are performed locally in your browser. No health data is stored or transmitted to any server.

Inputs

Segment pace

Results

At this pace

WR pace reference