SplitLab

Shareable Pace Card

Marathon

 

Goal

4:00:00

9:09/mi

5:41/km

  1. 10K56:53
  2. Half2:00:00
  3. 20 mi3:03:05
  4. Finish4:00:00
SplitLabsplitlab.run

 

mi
Type any distance to make a custom card. Tap the unit to switch miles and kilometers.
h:mm:ss or mm:ss. 4:00:00 is four hours.
Shown on the card, e.g. a race name. Up to 32 characters.

Even pace for the distance you pick — a picture of your goal, not a prediction. Pace calculator · Marathon pace · Half marathon pace · Race pace band · Race time predictor.

Why a pace card

A goal you can see is easier to run. The card puts the three numbers that matter on race day — finish time, pace per mile, pace per kilometer — on one high-contrast image. Set it as your lock screen for the week before the race, drop it in the group chat so your crew knows where to stand, or send the link to a pacer so you are both looking at the same clocks.

Shared links reopen the exact card. The address bar carries the distance, goal time, units, and label, so nothing is saved on a server and there is no account.

Worked examples

How it works

Arithmetic, not physiology. Pace = goal time / distance, and every checkpoint on the card is that pace times the distance to the mark. Marathon is 42.195 km (26.22 mi), half is 21.0975 km (13.11 mi), and 1 mile = 1.609344 km. The card does not tell you whether a goal is realistic; it shows what the goal means. This page does not clone VDOT or McMillan tables.

  • pace /mi = time / miles
  • pace /km = time / kilometers
  • 4:00:00 / 26.22 mi ≈ 549 s = 9:09 /mi
  • 4:00:00 / 42.195 km ≈ 341 s = 5:41 /km

Need a goal first? Estimate one with the race time predictor. Need every split? Use the split calculator or print a race pace band. Deeper plans live on the marathon · half marathon · 10K · 5K pace pages.

Pacing aid only. Not a training plan. Not medical advice.

FAQ

What is a pace card?

A pace card is a single image of your race goal: the finish time, the even pace it takes in min/mile and min/km, and a few checkpoint clocks. SplitLab draws it live as you type and lets you save it as a PNG or share a link that reopens the same card.

What pace is a 4-hour marathon?

A 4:00:00 marathon is 9:09 per mile, or 5:41 per kilometer, at even pace. The marathon is 42.195 km (about 26.22 mi), so 14,400 seconds ÷ 26.22 mi ≈ 549 s = 9:09/mi, and 14,400 ÷ 42.195 km ≈ 341 s = 5:41/km. Halfway is 2:00:00.

How does the share link work?

The card lives in the address bar. A 4-hour marathon is /tools/pace-card?d=marathon&t=4:00:00; a custom distance looks like d=30km or d=12mi, u=km switches the splits to metric, and n= adds your label. Anyone who opens the link sees the same card. Nothing is stored on a server.

How is the PNG made? Is anything uploaded?

Your browser draws the card onto a canvas and saves it as a 1080×1350 PNG (a 4:5 portrait that fits phone screens and social feeds). Nothing is uploaded, and there is no signup. Share uses your device’s share sheet when it has one; otherwise the link is copied to your clipboard.

Is this a race predictor?

No. The card is arithmetic: pace = goal time ÷ distance, and each checkpoint assumes you hold that exact pace. It does not judge whether the goal is realistic, and it is not VDOT or McMillan. To estimate a goal from a recent race, use the race time predictor (Riegel), then put the result on a card.

Which splits are on the card?

A few race-day checkpoints, then the finish. Marathon: 10K, half, and 20 mi (US) or 10K, half, 30K, and 40K (metric). Half: 5 mi, 10K, 10 mi or 5K, 10K, 15K, 20K. 10K and 5K use mile or kilometer marks. Custom distances show the quarter, half, and three-quarter points. For every mile or kilometer, use the split calculator or the race pace band.