Set the speed ratio

Seconds, M:SS or H:MM:SS. Example: 27.5 or 5:30. Blank or malformed clocks clear the answer.

Target: 200m. Distance and unit stay linked to the reference. Custom units are m, km or miles.

50–125% of reference speed. The named examples below retain the original percentages; they are not measured training zones or RPE scores.

Time at this speed

Illustrative example: 27.5 s for 200m.

34.4 s

for 200m at 80% of reference speed.

Reference pace / mile
3:41
Target pace / mile
4:37

This percentage scales reference speed. Same-distance time is about 1.25× the reference time.

Read the ratio

Target time = 27.5 seconds × (200m ÷ 200m) × (100 ÷ 80). Calculated seconds, rounded to 3 decimal places: 34.375.

Short times display to tenths of a second; from one minute, clocks and mile paces round to whole seconds. Rounding carries across minutes and hours. Very small positive times and values beyond whole-second precision are labeled explicitly.

Distance and speed scale linearly. This is not a race predictor across different distances or a calibrated model of RPE, heart rate, fatigue, heat, wind or humidity. Named percentage examples are editable starting points.

One mile is approximated as 1609.34m. The selected speed, rather than effort as a physiological quantity, controls the calculation.