Calculate your Acute:Chronic Workload Ratio (ACWR) — this week's training load compared to your rolling 4-week average — and get a suggested number of recovery days for the week ahead.
Quick Facts
Method
Acute:Chronic Workload Ratio (ACWR)
ACWR = 7-day (acute) load ÷ 4-week average weekly (chronic) load. A ratio near 1.0 means this week matches your recent baseline.
Results
Calculated
ACWR
—
Acute load ÷ chronic load
Risk zone
—
Based on published ACWR ranges
Additional recovery days needed
—
Beyond what you've already planned
Load change to reach 1.00
—
AU needed to hit your baseline
Ready
Enter this week's load and your 4-week average, then press Calculate to see your ACWR and recovery guidance.
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Understanding the Recovery Day Load Balancer
This tool uses the Acute:Chronic Workload Ratio (ACWR), a training-load monitoring method widely used in sports science and strength & conditioning to compare a recent spike or dip in training against an athlete's established baseline. "Acute load" is your training load over the last 7 days; "chronic load" is your average weekly load over the last 4 weeks. Dividing one by the other produces a single ratio that flags whether this week's load is rising faster than your body has adapted to.
The formula
ACWR = Acute load (last 7 days) ÷ Chronic load (average weekly load over last 4 weeks)
Training load itself is commonly measured in arbitrary units (AU), most often as session-RPE (a 0–10 perceived-exertion rating) multiplied by session duration in minutes, then summed across the week. Any consistent load metric works as long as you use the same one for both the acute and chronic figures.
Reading the ratio
Below 0.80 — this week's load is well under your recent baseline. Fitness may be tapering; there's typically room to build load back up gradually.
0.80 to 1.30 — often described as the "sweet spot," where this week's load closely tracks your 4-week average.
1.30 to 1.50 — a caution zone; load is climbing noticeably faster than your baseline.
Above 1.50 — a sharp week-over-week spike relative to your recent training history.
This calculator turns those zones into a practical suggestion for how many recovery days to schedule in the coming week, and shows how much your acute load would need to change to bring the ratio back to exactly 1.00 (this week matching your baseline).
Limits of the method
ACWR is a planning heuristic, not a diagnostic test. It does not account for sleep, nutrition, prior injury history, or how load is distributed across the week (a rest day followed by three hard sessions can produce the same weekly total as five moderate sessions). Use it alongside how your body actually feels, and consult a coach, physical therapist, or physician for any pain, persistent fatigue, or injury concerns.
Frequently Asked Questions
What is the Acute:Chronic Workload Ratio (ACWR)?
ACWR compares your training load over the past 7 days (acute load) to your average weekly load over the past 4 weeks (chronic load): ACWR = acute ÷ chronic. A ratio of 1.00 means this week matches your recent baseline; higher ratios mean load is rising faster than that baseline, lower ratios mean it's easing off.
What ACWR range is considered the "sweet spot"?
A ratio roughly between 0.80 and 1.30 is commonly cited as the range where training load most closely tracks an athlete's established baseline, with progressively larger deviations above 1.30 and especially above 1.50 representing bigger week-over-week jumps. These are general planning ranges from the sports-science literature, not a guarantee about any individual.
How many recovery days does this calculator suggest?
The suggestion scales with your risk zone — more recovery days as your ratio climbs further above 1.30. It's a general planning guideline based on your inputs, not a prescription. Adjust based on how you feel, your sport's demands, and guidance from a coach or healthcare provider, especially if you have an injury history.
Why might my result differ from what my coach or trainer recommends?
A coach factors in your full training history, sleep, nutrition, sport-specific demands, and how load is distributed day to day — this calculator only sees the two numbers you enter. Treat the ACWR and suggested recovery days as a starting point for a conversation, not a replacement for individualized coaching or medical advice.