Set the scenario

Seconds, M:SS or H:MM:SS; for example, 1110 or 18:30. Blank and malformed clocks clear the result.

City elevations are approximate examples, not verified track elevations. Use a measured venue elevation when available.

Selected elevation: 1,609 m. 1 ft = 0.3048m; changing the unit reinterprets the entered number.

Selected distance: 5,000m. Custom units: m, km or miles. One mile uses the existing 1609.34m approximation.

Sea-level scenario

Illustrative example: 18:30 · 5K · 1,609 m.

18:17

Model comparison, not an official conversion.

Recorded time
18:30
Model factor
1.011×

Recorded minus model time: 12.611 seconds. Factor minus 1: 1.149%.

Read the model

Sea-level scenario = 1,110 seconds ÷ 1.01149154030. Calculated model time: 1,097.389 seconds (rounded to 3 decimal places).

Clocks round to whole seconds, carrying into minutes and hours. Positive times below half a second and values beyond whole-second precision are labeled explicitly. Differences are signed seconds, not a promised gain.

The factor uses the existing empirical quartic fit in ln(elevation), ln(distance) and ln(elevation × distance). Its eight coefficients are unchanged. The repository provides no published calibration source or independently established range of validity.

This model does not account for acclimatization, weather, course or individual response. It is not an NCAA, World Athletics or meet qualification conversion. Use the relevant governing rules for official entries and scoring.