Create a simple daily hydration planning estimate from body weight, a chosen ounces-per-pound factor and optional exercise fluid.
Body composition, energy, strength and fitness estimates for general reference.
Enter the requested values above and select Calculate. Change any input to compare scenarios instantly.
A 160 lb person using 0.5 oz/lb starts with 80 fl oz before any optional exercise adjustment.
Create a simple daily hydration planning estimate from body weight, a chosen ounces-per-pound factor and optional exercise fluid. Use it for quick estimates and comparisons; verify high-stakes health, training or measurement decisions with an appropriate authoritative source.
Create a simple daily hydration planning estimate from body weight, a chosen ounces-per-pound factor and optional exercise fluid.
Daily fluid estimate = body weight × chosen oz/lb factor + exercise minutes ÷ 30 × exercise fluid per 30 minutes.
Yes. ERICH Calculators is free to use and no account is required.
Hydration needs vary with climate, diet, health conditions, pregnancy, medications and exercise. This is a planning estimate, not medical guidance.
See how formulas, sources and limitations are handled across ERICH Calculators.