Lactate Test Calculator
Add each cycling test repetition with power and measured lactate, then estimate thresholds from the lactate curve.
How Lactate Testing Works
A cycling lactate test uses repeated efforts at rising power. After each repetition, blood lactate is measured and plotted against the power for that step. The curve helps identify how quickly lactate rises as the rider moves from easy aerobic work into harder threshold work.
The Mader method uses the power where blood lactate reaches 4.0 mmol/L as a fixed anaerobic threshold estimate. This calculator also shows a 2.0 mmol/L marker as an aerobic threshold reference. Both are interpolated between the closest measured points, so the test should include steps below and above each target.
Fixed lactate values are useful for repeatable tracking, but they are not universal physiological breakpoints. Keep your protocol consistent - step length, recovery, sampling timing and equipment - when comparing tests over time.