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Pace Zone Planner

Apply editable percentage bands to a threshold value you enter, with pace and speed shown as exact inverse conversions.

Non-medical, non-prescriptive: This tool performs unit and percentage math only. Preset names and bands are illustrative organizational labels, not individualized training zones, workout advice, safety clearance, or a recommendation to exercise at any intensity. Choose inputs and activity decisions independently, and seek qualified guidance when appropriate.

Threshold input

Sport presetRunningCyclingSwimming

Display systemMetricImperial

Threshold sourceThreshold paceThreshold speedTime-trial distance and time

Threshold pacemin:sec per km

Example interval distance

Example distance unitkmmilesmetersyards

Calculate zonesAdd zoneReset

Editable percentage bands

Name	Minimum (% threshold speed)	Maximum (% threshold speed)

Bands apply to speed, not pace. Because pace is inverse, the faster maximum-speed boundary becomes the lower pace time shown first.

Math conventions: A 100% boundary equals the entered/derived threshold speed. For a band from L% to H%, speed is threshold × L% through threshold × H%; pace is displayed in the reverse boundary order: distance ÷ (threshold × H%) through distance ÷ (threshold × L%). The example interval column applies the same bounds to the entered distance and is only a conversion example, not a suggested interval or training prescription. Rounding affects display only; exports include higher-precision values.