Health & Fitness · Free tool
Electrolyte Replacement Calculator
Water, sodium, and potassium targets for endurance training — tuned to body weight, sweat rate, and climate.
Updated April 2026
Water target
30 oz
Sodium
900 mg
Potassium
230 mg
Not medical advice — consult a provider, especially if you have kidney, heart, or blood pressure conditions.
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What it does
Dial in sodium, potassium, and water for any training length and climate.
Runs entirely in your browser — no upload, no account, no watermark. For more tools in this category see the full tools index.
How to use it
- Set body weight.
- Pick sweat rate and climate.
- Read per-hour targets.
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