Model a gradual starting weight, target weight, or timeline using a selected 0.25% to 1.0% weekly change in starting body mass.
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
The requested output field is hidden, disabled, cleared, and made non-required. Only source values needed for the selected relationship remain available.
How to Use This Calculator
- Select the result you want in the Solve for menu.
- Enter only the visible source values and their explicit units.
- 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 | Choose 0.25% through 1.0% of starting body mass for this conservative planning model. |
| 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 time-to-target result rounds up to the next tenth of a week. |
| Checkpoints | Displayed checkpoints are mathematical targets and must be reviewed against health, training, and recovery. |
Interpreting the Result
Compare results only when the ruleset, units, tracking definitions, and sample boundaries are consistent.
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
American College of Sports Medicine, Expert Consensus Statement on Weight Loss in Weight-Category Sports, 2021; World Boxing Council, Weight Management Program 2.0; applicable athletic commission and event rules.