Plan a fight camp weight cut: find the weeks needed to reach a target weight at a gradual 0.25% to 1% weekly loss, or solve for target or starting weight.
Fight Camp Weight Cut Formula or Method
The planner applies a linear weekly body-mass change to the starting weight. It deliberately excludes acute dehydration, sweat loss, fasting, and a separate final-week cut.
How the Calculation Works
Select a known pair of source quantities to solve the remaining quantity. The weekly change stays fixed as a percentage of starting mass; it is not compounded from each week’s remaining weight. This arithmetic does not establish a safe rate or medically appropriate target.
How to Use This Calculator
- Select the result you want in the Solve for menu.
- Enter the visible source values. Weight-unit controls convert entered mass; the solved-weight selector controls its displayed unit.
- Select Calculate and review the primary answer, supporting values, and substituted steps.
- Use Reset before starting a different fighter, bout, or scenario.
Worked Example
From 180 lb at 0.75% per week, the model changes 1.35 lb per week. Reaching 171.9 lb takes 6 weeks under the arithmetic model.
Input and Result Guide
| Item | How to use it |
|---|---|
| Weekly rate | Enter 0.25% through 1.0% of starting body mass as a model input. This permitted range is not a recommended or individually safe rate. |
| Starting weight | Use a normally hydrated baseline measured under repeatable conditions. |
| Target weight | Treat the result as a discussion point, not permission to enter a division. |
| Timeline | The modeled duration is displayed to six decimal places, with a separate whole-week value rounded upward. Duration is limited to 200 weeks; mass inputs and solved mass are limited to 1–1,000 in the selected units. These are numerical limits, not clinical screening. |
| Checkpoints | Displayed checkpoints are mathematical targets and must be reviewed against health, training, and recovery. |
Interpreting the Result
Actual weight change is not reliably linear. A fixed weekly amount becomes a larger percentage of remaining mass over time. Review the goal, energy availability, training and health with qualified sports-medical and nutrition professionals.
Assumptions and Limitations
This tool cannot determine whether weight loss is appropriate or safe. It must not be used to plan dehydration, fluid restriction, sauna use, vomiting, laxatives, diuretics, fasting, or rapid weigh-in manipulation. Athletes, especially minors, should work with a physician and qualified sports dietitian, and must follow their commission or governing body.
Common Questions
Why did an input disappear when I changed Solve for?
The hidden field is the requested output. Enter the remaining visible values and the calculator will solve for that target.
Will my last successful calculation be restored?
Yes. The calculator saves enabled source values and the successful result in this browser. Reset clears that saved state.
Sources
ACSM2021 consensus statement; Australian Institute of Sport making-weight guidelines. These sources guide individualized professional assessment; they do not validate this calculator’s fixed-linear model.
