Weight Cut For Sport Calculator

Work out weight cut for sport instantly with clear inputs, formula shown and shareable results.

About Weight Cut For Sport Calculator

Cutting from 80 kg to 77 kg is 3 kg, or 3.75% of body weight. At a safe gradual rate of 1% a week, fourteen days allows about 1.6 kg, so the remainder would require acute manipulation of glycogen, fibre and fluid. Cuts above about 5% of body weight in a short window are where the serious risks concentrate.

Formulas

Cut size

percentage = (current - target) / current x 100

Safe gradual loss

about 1% of body weight per week

Worked example

With the default values below, Weight Cut For Sport Calculator returns Weight To Lose of 3.00. Change any input above and every figure here is recalculated in your browser.

Inputs used

Current weightminimum 0 kg: 80 kg
Weight class limitminimum 0 kg: 77 kg
Days until weigh-inminimum 0: 14

Results

Weight To Lose: 3.00 kg
As A Share Of Body Weight: 3.75%
Achievable Through Gradual Loss: 1.60 kg
Assessment: Requires some acute water manipulation - do this under qualified supervision

Step by step

1Values used
2Cut size
3Safe gradual loss
4Weight To Lose= 3.00 kg
5As A Share Of Body Weight= 3.75
6Achievable Through Gradual Loss= 1.60 kg
7Assessment= Requires some acute water manipulation - do this under qualified supervision

Assumptions and limits

The result is derived only from the 3 inputs listed above. Anything not among them is not part of the calculation.
In particular, this calculator does not take inflation, tax, fees or charges or compounding frequency into account.
Figures are rounded for display to 2 decimal places, so totals built from several rounded parts can differ slightly from the unrounded arithmetic.
Acute weight cutting carries real risks including dehydration, impaired performance, kidney injury and, in extreme cases, death. This calculator is informational only and is not a cutting protocol. Any weight cut should be planned and supervised by qualified sports medicine and nutrition professionals within your federation's rules.
This is an estimate for general information and not professional medical advice. See the full disclaimer for the limits that apply to this kind of calculator.

How these calculators are built and tested is described on the Methodology page. If a figure looks wrong, please report it.

Acute weight cutting carries real risks including dehydration, impaired performance, kidney injury and, in extreme cases, death. This calculator is informational only and is not a cutting protocol. Any weight cut should be planned and supervised by qualified sports medicine and nutrition professionals within your federation's rules.

Frequently Asked Questions

Is water cutting safe?

It carries genuine risk of heat illness, kidney injury and impaired performance, and several deaths are on record. It requires medical supervision and adequate rehydration time.

What should I do if the cut is too big?

Move up a weight class. Chronic heavy cutting harms performance, growth in younger athletes and long-term health.