Calculator Inputs and Outputs
Inputs
- Pre-exercise body weight (kg) — example: 72.5
- Post-exercise body weight (kg) — example: 71.8
- Fluid consumed (L) — example: 0.8
- Urine produced (L) — example: 0
- Exercise duration (hours) — example: 1.5
Results
- Estimated fluid loss rate (L/hour)
- Estimated total fluid loss (L)
- Body mass change
Formula used
Fluid loss = pre-weight − post-weight + fluid intake − urine; rate divides by duration.
How to Use the Hydration Loss Rate Calculator
Enter the requested values, check the units and assumptions, then select Calculate Hydration Loss Rate. The built-in defaults provide a complete working example.
Formula
Fluid loss = pre-weight − post-weight + fluid intake − urine; rate divides by duration.
Understanding the Results
The primary answer appears first. Supporting outputs show related quantities, conversions, dates, costs, ratios, or intermediate values. Calculations keep additional precision before display rounding.
Accuracy Tips
- Use measured values and consistent units.
- Review assumptions, rates, timing, and efficiency inputs.
- Recalculate after changing any condition.
Important Note
This tool provides an informational estimate. Confirm critical financial, medical, construction, scientific, tax, legal, or safety decisions with an appropriately qualified professional.
Calculation Standards
This tool uses documented formulas and high-precision internal values. Displayed results may be rounded for readability. Review the assumptions and verify important decisions with a qualified professional.
Read our calculation methodology