Weight Class Jump Calculator

Performance impact from moving up or down in weight.

Progress0%

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Walk-around weight (kg)

Current weight class (kg)

Target weight class (kg)

How to Use This Calculator

Enter your walk-around weight, current weight class, and target weight class in kilograms.
Add your height, reach, and body fat percentage for size and composition context.
Review the current and new weight cut amounts and percentages, along with their risk ratings from safe to dangerous.
Check lean body mass along with your height and reach advantage compared to the average fighter at the target class.
Use the viability score and power-to-weight change to gauge whether the move up or down is favorable.

How the result changes with Height (cm)

Height (cm)	Viability score (0-100)
156	55
171	69
189	85
204	85

What each input means

Walk-around weight (kg): Natural body weight outside of camp (out-of-camp weight).
Current weight class (kg): Current weight class limit in kg.
Target weight class (kg): Weight class you are considering moving to.
Height (cm): Your height in centimeters.
Reach (cm): Fingertip-to-fingertip reach in centimeters.
Body fat %: Estimated body fat percentage.

What each result means

Viability score (0-100): Overall score for the weight class move (higher = more favorable).
Class difference (kg): Weight difference between classes (positive = moving up).
Current cut (kg): Weight you currently cut to make your class.
Current cut %: Current weight cut as percentage of body weight.
New cut needed (kg): Weight cut needed for target class.
New cut %: New weight cut as percentage of body weight.
Current cut risk (0-4): 0=None, 1=Safe, 2=Moderate, 3=Aggressive, 4=Dangerous.
New cut risk (0-4): Risk level for the new weight class cut.
Lean body mass (kg): Estimated lean mass (fat-free body weight).
Height advantage (cm): Your height vs. average for the target class (positive = taller).
Reach advantage (cm): Your reach vs. average for the target class.
Power-to-weight change %: Estimated change in power-to-weight ratio at new class.

How this is calculated

Worked example, using the default values

Identify Input Parameters
4 parameters
Walk-around weight (kg) = 84, Current weight class (kg) = 77, Target weight class (kg) = 84, Height (cm) = 180 = 6 input(s) provided
Calculate Viability score
Viability score = 50
83 = 83
Calculate Class difference
Class difference = targetClassKg - currentClassKg
7 = 7
Calculate Current cut
Current cut = walkAroundKg - currentClassKg
7 = 7

Engine last updated August 6, 2026.

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