Pre-Workout Caffeine Calculator
Find your safe pre-workout caffeine dose by body weight — and check if stacking with coffee is safe.
✓ Last reviewed March 2026 · Sports medicine guidelines
Calculate Your Safe Pre-Workout Dose
Performance Dosing Guide
Sports dietitians and the Australian Institute of Sport recognize caffeine as one of very few evidence-backed performance supplements. The research-supported dose for endurance and strength performance is 3–6mg per kg of body weight, taken 30–60 minutes before exercise.
| Body Weight | Mild (3mg/kg) | Moderate (4.5mg/kg) | Max (6mg/kg) |
|---|---|---|---|
| 60kg (132lbs) | 180mg | 270mg | 360mg |
| 70kg (154lbs) | 210mg | 315mg | 420mg |
| 80kg (176lbs) | 240mg | 360mg | 480mg |
| 90kg (198lbs) | 270mg | 405mg | 540mg |
| 100kg (220lbs) | 300mg | 450mg | 600mg |
⚠️ The stacking danger: A pre-workout (300mg) + morning coffee (95mg) + post-workout energy drink (200mg) = 595mg — well above safe limits for most body weights. Always count all caffeine sources when calculating your total daily load.
How much caffeine is in pre-workout?
Pre-workout supplements vary enormously: from 150mg (C4 Original) to 400mg+ (some extreme formulas) per scoop. The average mainstream pre-workout contains 175–250mg per scoop. Always check the label — serving sizes and caffeine amounts differ significantly between products.
Is it safe to drink coffee and take pre-workout?
Only if the combined total stays within your safe daily limit. A 175mg pre-workout + 1 cup coffee (95mg) = 270mg — fine for most adults. A 300mg pre-workout + 2 coffees (190mg) = 490mg — over FDA guidelines for average adults. Calculate your total before combining.
When should I take pre-workout for best effect?
30–60 minutes before exercise, as caffeine blood levels peak at approximately 45–60 minutes post-consumption. Taking it too early reduces the performance benefit; taking it right before exercise means peak levels come mid-workout rather than at the start.
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Medical Disclaimer: Educational guide based on published research. Not medical advice. Consult a healthcare provider for personalised guidance. Last reviewed March 2026.