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Acute Chronic Workload Ratio Calculator

Work out acute chronic workload ratio instantly with clear inputs, formula shown and shareable results.

About Acute Chronic Workload Ratio Calculator

ACWR compares this week's load with the rolling four-week average, so it measures how much you have spiked relative to what your body is prepared for. Ratios between 0.8 and 1.3 are the commonly cited sweet spot; above 1.5 injury rates rise sharply in team-sport data. 2200 against 1900 gives 1.16 - comfortably inside the safe band.

Formulas

Workload ratio

ACWR = acute load / chronic load

Safe ceiling

ceiling = chronic load x 1.3

Worked example

With the default values below, Acute Chronic Workload Ratio Calculator returns Acute To Chronic Workload Ratio of 1.158. Change any input above and every figure here is recalculated in your browser.

Inputs used

Acute load, this weekminimum 0 AU
2,200 AU
Chronic load, four-week averageminimum 0 AU
1,900 AU

Results

Acute To Chronic Workload Ratio
1.158
Load Above The Chronic Average
300 AU
Upper Safe Weekly Load
2,470 AU
Risk Assessment
Sweet spot - load is well matched to fitness

Step by step

  1. 1Values used
  2. 2Workload ratio
  3. 3Safe ceiling
  4. 4Acute To Chronic Workload Ratio= 1.158
  5. 5Load Above The Chronic Average= 300 AU
  6. 6Upper Safe Weekly Load= 2,470 AU
  7. 7Risk Assessment= Sweet spot - load is well matched to fitness

Assumptions and limits

  • The result is derived only from the 2 inputs listed above. Anything not among them is not part of the calculation.
  • In particular, this calculator does not take inflation, tax or compounding frequency into account.
  • Figures are rounded for display to 3 decimal places, so totals built from several rounded parts can differ slightly from the unrounded arithmetic.
  • This is an estimate from population-average equations, not a medical or diagnostic assessment. Individual results vary with genetics, training history and technique. Seek advice from a qualified coach or clinician before making significant changes to training.
  • This is an estimate for general information and not professional medical advice. See the full disclaimer for the limits that apply to this kind of calculator.

How these calculators are built and tested is described on the Methodology page. If a figure looks wrong, please report it.

This is an estimate from population-average equations, not a medical or diagnostic assessment. Individual results vary with genetics, training history and technique. Seek advice from a qualified coach or clinician before making significant changes to training.

Frequently Asked Questions

Why is a low ratio also flagged?

Because chronically undertraining loses the fitness that protects against injury. Ratios under 0.8 mean you are detraining relative to your recent norm.

Is ACWR proven?

It is useful but debated - the original studies have been criticised on statistical grounds. Treat it as one signal alongside soreness, sleep and performance.

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