Vertical Speed Calculator

Calculate neutral ascent or descent rates from signed vertical distance and elapsed time.

Inputs and method

Enter signed vertical distance and elapsed minutes and seconds. The calculator converts distance exactly, divides by raw elapsed time, and reports neutral per-second, per-minute, and per-hour rates.

Interpreting the estimate

Use the result as a planning value and keep input precision consistent with the measurements or source data you have. Small displayed differences can come from final-place rounding; intermediate values are not rounded.

Assumptions and limits

Positive and negative values indicate direction only. Terrain, horizontal distance, pauses, measurement error, aircraft performance, and personal capability are outside the calculation.

Empty entries, invalid numbers, zero elapsed time, impossible relationships, and unsupported options trigger a validation message instead of a misleading result. A nonzero rate whose supported fixed-precision values would all round to zero is reported as too small to display rather than as an available zero result.

Method basis

The rates are publisher derivations from signed distance and elapsed time. NIST Special Publication 811 defines the international foot as exactly 0.3048 meter, so feet are multiplied by 0.3048 to obtain meters and meters are divided by 0.3048 to obtain feet. No aircraft, hiking, or personal-performance inference is made.