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Your pace band

Your race and your goal time: your splits, ready to print for your wrist or keep as a lock screen, plus the whole race played back in fast-forward.

Your goal time
h
min
s
The time you want to see on the finish-line clock.
See my pace band ↓
Your pace
At halfway

Your pace band

Print at actual size (100%): you get a 22 cm (8.7 in) strip. Cut along the dotted lines and tape over the hatched area. The wallpaper lands in your downloads: save it to Photos, then set it as your lock screen.

Your race, in fast-forward

Change your goal time
How it's calculated
  1. The distances are the official road-race distances: 5 km, 10 km, half marathon 21.0975 km, marathon 42.195 km (World Athletics technical rules). In miles: 1 mile = exactly 1.609344 km (the 1959 international yard and pound agreement).
  2. Your pace: your goal time divided by the distance, rounded to the nearest second. It's the exact goal-pace calculation the Cadevia app uses. Per mile, the per-kilometer pace is multiplied by 1.609344 before rounding.
  3. Your splits are worked out from your goal time, not from the rounded pace, then rounded to the second: your finish lands exactly on your goal. With the rounded pace, a 3:45:00 marathon goal (8:35 per mile, 5:20 per kilometer) would finish at 3:45:03 on a mile band, 3:45:02 on a kilometer band.
  4. Finish a little faster: a "negative split" means running the second half about 1 to 3% faster than the first (G. V. Grivas, K. Safari, M. Hemmatinafar, "Developing negative split pacing in endurance athletes", Frontiers in Physiology, 2026). Cadevia goes with 2%, the middle of that range: it's a Cadevia setting, not a law. Your second half takes 2% less time than your first, each half at an even pace, and the switch happens at halfway.
  5. Why not go out fast: among 78,912 Boston Marathon finishers (2015 to 2017), those who ran the first 10 km more than 5% faster than their average pace "hit the wall" (finishing more than 20% slower than their first 35 km) in 26.6% of cases, versus 1.5% for those who started at their own pace. Even pacing was what 82% of sub-3-hour runners did (Q. Dong, Z. Li, PLoS One, 2026).
  6. The safety check: under 4:08 per mile (2:34 per kilometer), the page warns you. That's faster than the 5K road world record (12:49, Berihu Aregawi, 2021, ratified by World Athletics), the shortest distance on this page.
  7. The printed band is 22 cm (8.7 in) long: 19 cm (7.5 in) of splits and 3 cm (1.2 in) to tape, enough to wrap a wrist up to 19 cm (7.5 in). The page prints in landscape, black on white, with nothing but the band.
  8. The wallpaper is 1179 × 2556 pixels, the screen resolution of the iPhone 15 and 16 (Apple tech specs). Your splits sit below the lock-screen clock; on another iPhone, iOS adjusts it.

Frequently asked questions

How do I calculate my marathon splits?

Divide your goal time by 26.2 miles (42.195 km) to get your pace, then multiply it by each mile. For 3:45, that's 8:35 per mile (5:20 per km) and 1:52:30 at halfway. The tool starts from your goal time so your finish lands exactly on it.

Even pace or negative split?

Above all, don't start too fast: at the Boston Marathon, runners who ran the first 10 km more than 5% too fast “hit the wall” in 26.6% of cases, versus 1.5% (Dong and Li, 2026). Running the second half about 2% faster is a good strategy.

How do I print my pace band?

Tap “Print”: the page prints only the band, black on white, 22 cm (8.7 in) long. Cut it out and tape it around your wrist.

Can I get my splits in kilometers?

Yes: choose “Kilometers” and the pace and splits switch to kilometers.