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급성:만성 운동량 비율(ACWR)을 계산하여 부상 위험을 평가하세요.
Training Load Calculator
Previous 4 weeks
Acute:Chronic Ratio
Safe zone
1.09 ACWR
Chronic Load (avg) 5.5 h/week
Week-on-week change +9%
<0.8 0.8 1.3 1.5 2.0+
Gabbett 2016 — Acute:Chronic Workload Ratio
ACWR = this week / 4-week average The Acute:Chronic Workload Ratio (ACWR) compares your recent training load (this week) to your average training load over the past 4 weeks. Research by Tim Gabbett (2016) shows that athletes are at significantly higher injury risk when this ratio exceeds 1.5 — the so-called "danger zone." The safe zone is 0.8–1.3, where performance improvements occur with minimal injury risk.
How to Use This Calculator
1
Enter your training hours for each of the past 4 weeks (oldest to most recent).
2
Enter your training hours for this current week (acute load).
3
Your ACWR, injury risk zone, chronic load average, and week-on-week change update instantly.
4
Use this weekly to monitor ramp rate before adding volume.
Understanding ACWR and Training Load
The Acute:Chronic Workload Ratio was popularized by sports scientist Tim Gabbett in 2016 as a practical tool for managing injury risk in team sports athletes. It has since been validated across endurance sports, gym-based training, and strength athletes.
The key insight: it’s not high training load that causes injuries — it’s sudden increases in load relative to what your body is conditioned to handle.
ACWR Risk Zones
ACWR < 0.8 (Undertraining): You’re training significantly below your chronic baseline. Fitness is likely declining. A sudden jump in load from here can be dangerous.
ACWR 0.8–1.3 (Safe Zone): The "sweet spot." Training is appropriately challenging relative to your fitness base. Associated with performance gains and low injury risk.
ACWR 1.3–1.5 (Caution): You’re ramping up faster than ideal. Monitor for signs of fatigue. Acceptable short-term if approaching a competition.
ACWR > 1.5 (Danger Zone): Injury risk increases substantially. This is where overuse injuries and acute strains become much more likely. Back off volume.
The 10% Rule
A practical guideline from endurance sport: never increase your weekly training load by more than 10% from the previous week. While the ACWR is more nuanced, the 10% rule provides a simple guardrail for week-on-week changes. This calculator shows your exact percentage change so you can monitor it directly.
Training Load Units
This calculator uses training hours as the load unit — the simplest and most accessible metric. More advanced systems use RPE-based session RPE (Rating of Perceived Exertion × duration in minutes) or GPS-derived metrics. For most athletes and coaches, hours of training provide a practical and reliable proxy.
Training Load Calculator for Personal Trainers
Overreaching is one of the most common causes of client dropout and injury. This tool helps you monitor load progression objectively — particularly useful for clients who tend to do too much too fast when motivated, or who don’t recover well.
Use it weekly during program check-ins to justify load increases or pullbacks with data. With Gymkee, you can deliver structured programs with built-in progression that keeps clients in the safe zone week after week.
Frequently Asked Questions
What is a safe ACWR?
The safe zone is generally considered 0.8 to 1.3. An ACWR below 0.8 indicates undertraining (you’re well below your conditioning baseline). An ACWR above 1.5 is the danger zone associated with elevated injury risk based on sports science research.
Should I use hours or sessions as the load unit?
Hours are the simplest starting point. For more precision, use session RPE (effort level from 1–10) multiplied by session duration in minutes. This captures both volume and intensity. However, for general fitness clients, training hours provide a reliable enough proxy.
Is this relevant for beginners?
Yes — arguably more so. Beginners have a low chronic load baseline, meaning even moderate increases can produce a high ACWR. A beginner going from 0 to 5 hours of training in one week technically has an infinite ACWR. Build volume progressively over 8–12 weeks before pushing intensity.
What if my ACWR is in the danger zone this week?
Reduce training volume by 20–30% this week. Prioritize sleep and recovery nutrition. Do not try to compensate by adding more next week — that compounds the problem. Return to the safe zone before resuming progression.
How does this apply to strength training vs cardio?
Both apply. For strength training, load can be measured as total training time or tonnage (sets × reps × weight). For cardio, hours or distance are natural units. The ACWR principle is the same: acute load divided by chronic baseline.
Can this predict injury?
No calculator can predict injury with certainty. ACWR is a risk indicator, not a guarantee. Other factors (sleep quality, nutrition, movement mechanics, training history) all contribute to injury risk. Use ACWR as one input alongside subjective wellness monitoring.
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