Endurometry
What does this calculator do?
The simple pace-band generator turns a goal finish into even cumulative splits for every kilometre or mile, plus a leftover finish row when the official distance is not a whole number of units. Default: marathon 4:00:00, per km.
It is a printable card grid, not the wrap-around wristband. For negative/positive strategy and wrist sizing, use the printable pace wristband.
How does it work?
Pace per unit = finish time ÷ (distance in km or miles). Split n = n × that pace. A remainder over 5 m becomes a final row at the official finish (42.195 km or ~13.11 mi), labelled with the true distance — never a hardcoded “42.195 km” on a half.
Same split engine as the pace calculator. No VDOT, no hills, no GPS extra distance.
Formula
units = distance / (1 km or 1.609344 km) pace/unit = goal time / units split n = n × pace/unit finish row (if remainder > 5 m): time = goal, label = true distance
Times to the nearest second. Goal times 1 min–8 h.
Worked example
Default: marathon 42.195 km, 4:00:00, splits in km.
- Units = 42.195; pace = 14,400 / 42.195 → 5:41/km (9:09/mi)
- 42 whole km rows; last whole km cumulative 3:58:53
- Remainder 0.195 km → finish row 42.195 km at 4:00:00
- Half marathon in km: finish row is 21.0975 km, not 42.195 km
Generate with the defaults: 5:41/km and 43 cards ending at 4:00:00.
How to interpret the result
Read each card as “if I run even, I should see this clock here.” GPS often reads long; the band uses the certified distance. Going out faster than 5:41 on a 4-hour marathon is a choice, not what this page prints.
Wrap-around paper: printable wristband. Dual-unit chart plus VDOT zones: pace chart generator.
Assumptions and limitations
Assumptions
- Even pace from gun/mat to finish.
- Distance is the World Athletics road preset.
- You print at 100% if you tape the grid to a bib.
Limitations
- Even splits only. Negative/positive ramps live on the wristband page.
- No course profile, wind or aid-station walking.
- GPS extra metres are not added.
- Times outside 1 min–8 h are rejected.
Methodology and sources
Method type: Exact calculation
Exact definition: cumulative even splits from goal time and official distance, including a true-distance finish row. Same split rules as the pace calculator.
Sources: NIST SP 811 · World Athletics Book of Rules
Last reviewed: October 5, 2026