Acute:Chronic Workload Ratio (ACWR) Calculator

About this calculator

The Acute:Chronic Workload Ratio (ACWR) compares an athlete's recent training load, usually the past 7 days, the acute load, against their longer-term average load, typically a rolling 4-week chronic average, to flag sudden, potentially risky spikes in training. The concept was popularized by sports scientist Tim Gabbett's research on injury risk in elite team-sport athletes, which found that ratios in a sweet-spot range around 0.8 to 1.3 were associated with lower injury rates, while ratios above roughly 1.5, a sharp spike relative to recent baseline, correlated with substantially higher injury risk.

Strength and conditioning coaches and sports medicine staff track ACWR week to week to decide whether to hold back or progress an athlete's training volume, using it alongside, not instead of, subjective wellness monitoring, since the ratio itself has been debated in the sports-science literature for methodological limitations like the mathematical coupling between the acute and chronic terms.

Enter your acute, recent, and chronic, longer-term average, training loads and this calculator returns the ACWR along with where it falls relative to the commonly cited risk zones.