Weight Cut Calculator

No — Total Weight to Cut is fixed by Current Weight minus Target Fight Weight and does not change with Weeks Until Fight or Body Fat Percentage. What a longer timeline changes is how that fixed amount gets split between gradual diet loss and the acute water cut in fight week.

Diet-phase weight loss is capped near 1% of body weight per week to stay sustainable, and that pace can't safely close a large gap in a single week. Reserving the final week for a controlled water cut — capped at roughly 8% of body weight — lets the diet phase run at a safer, steadier rate for every week before it.

It estimates lean body mass from Current Weight and Body Fat Percentage, then divides by 0.95 to back out a weight that still preserves about 5% essential body fat. If your Target Fight Weight falls below this floor, the calculator flags the cut as higher risk regardless of how many weeks you have.

It combines two things: the cut as a percentage of current body weight (5% or under is treated as safer, over 10% as high risk) and whether the target weight stays above the estimated minimum safe weight. Both conditions have to hold for a 'Safe' rating — failing either pushes the rating to moderate or high risk.

It's an estimate, not a guarantee — it assumes you regain about 80% of the water weight cut by fight time, aiming for a point between your target weigh-in weight and your walk-around weight. Real rehydration depends on the specific cutting method used and individual physiology, so treat it as a planning reference rather than a precise prediction.