Health & Fitness
Electrolyte Sweat Loss Calculator
Estimate sodium, potassium and magnesium lost in sweat and the replacement needed.
Preparing your result…
What this calculator does
Calculates Electrolyte Sweat Loss Calculator using the formula verified against the cited source.
What your result means
An estimate from the inputs you enter, within the scope stated below — not advice.
Formula
Sodium lost = sweat litres × sodium concentration (mg/L)
The step-by-step working for your own numbers appears with the result above and in the PDF report.
Frequently asked questions
Symbols and assumptions
- Inputs
- The values entered in the fields above
- • Estimated sodium lost mg=sweat rate L/hour×exercise duration hours×sweat sodium mg/L. If sodium is supplied in mmol/L, multiply by approximately 23 mg/mmol first.
Sources and review
Reviewed 2026-10-18 · Next review 2027-04-18
- • NATA fluid-replacement position statement supports individual sweat assessment. This is a loss estimate, not an automatic replacement dose. Concentration must represent the measured sweat and conditions; sweat rate alone cannot determine sodium loss. Do not confuse sodium mg with salt mg.
Important limitation
This is an educational estimate based only on the values and formula shown. Verify current rates, rules, units, and professional standards before relying on the result. It is not personalized financial or investment advice.
Quick reference
| Scenario | Sweat rate (L/hour) | Session duration (hours) | Sodium to replace |
|---|---|---|---|
| Worked example | 1.2 | 3 | 3,600 mg |
| Half the amounts | 0.6 | 1.5 | 900 mg |
| Double the amounts | 2.4 | 6 | 14,400 mg |
Need the full picture? Get the detailed PDF report with charts, tables, formulas and working steps.
Reviewed 2026-10-18 · Next review 2027-04-18
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