ACWR Calculator
Acute:chronic workload ratio and risk zone
AI logs your meals from a photo. Diet & workouts in one app.Get the free appthis week's total training load, e.g. 2400
your average weekly load over 4 weeks, e.g. 2000
ACWR Calculator
Most training injuries come not from being unfit but from doing too much too soon. The acute:chronic workload ratio benchmarks this week's load against the four weeks behind it. Enter your acute and chronic loads and this calculator returns your ACWR and the risk zone it falls in, so you can spot dangerous spikes early and keep load progression in the evidence-based sweet spot.
The acute:chronic workload ratio (ACWR) compares this week's training load with your rolling 4-week average. A ratio around 0.8–1.3 is the "sweet spot" linked to the lowest injury risk; below 0.8 suggests undertraining and detraining, while above 1.5 is the danger zone where spikes in load sharply raise soft-tissue injury risk. Use the same load metric (for example session-RPE AU) for both numbers and progress chronic load gradually.
Frequently Asked Questions
- What is the acute:chronic workload ratio (ACWR)?
- ACWR compares your recent training load (acute, usually the past 7 days) to your longer-term load (chronic, typically the rolling 28-day average). It is a simple gauge of whether you are ramping up too fast relative to what your body is conditioned for.
- How do you calculate ACWR?
- Divide your acute load by your chronic load: ACWR = 7-day load / 28-day average load. Enter both numbers and the calculator returns the ratio plus its risk zone. Use a consistent load metric such as session-RPE, distance, or training minutes for both inputs.
- What is a good ACWR value?
- A ratio of roughly 0.8-1.3 is the commonly cited sweet spot for managing injury risk, while values above about 1.5 mark a danger zone of rapid load spikes. Very low ratios suggest undertraining. Aim for gradual, steady increases week to week.