Work out weight cut for sport instantly with clear inputs, formula shown and shareable results.
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.
Cut size
percentage = (current - target) / current x 100
Safe gradual loss
about 1% of body weight per week
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.
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.
Move up a weight class. Chronic heavy cutting harms performance, growth in younger athletes and long-term health.