Hydration Tools
Explore our curated collection of calculators and guides related to Hydration. Use these scientific tools to optimize your performance and health.
Sweat Rate Calculator — Hydration Deficit & Fluid Needs
Calculate your personal sweat rate per hour, hydration deficit, and post-exercise fluid replacement target based on pre and post-exercise body weight.
Electrolyte Calculator for Athletes — Sodium, Potassium & Magnesium
Calculate your hourly and total electrolyte needs during exercise based on body weight, duration, intensity, and temperature.
Heat Hydration Calculator — Running in Hot Weather Fluid Needs
Calculate your adjusted hourly fluid and sodium needs for running or racing in hot and humid conditions, with warning levels for dangerous heat loads.
Sweat Test Calculator — Your Personal Sweat Rate in oz/hr
Calculate your exact sweat rate and fluid replacement needs using the professional weigh-in/weigh-out sweat test method, with results in oz/hr and sodium estimates.
Race Altitude Adjustment Calculator — High Altitude Pace & Hydration
Calculate your adjusted race pace, extra hydration needs, and acclimatisation requirements for racing or training at altitude, based on Daniels' altitude formula.