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Boxing Weight Class Calculator

Work out boxing weight class instantly with clear inputs, formula shown and shareable results.

About Boxing Weight Class Calculator

Professional boxing limits are defined in pounds, so the weight is converted at 2.2046226 lb per kg and matched to the lowest division whose limit it does not exceed. Because the divisions are only a few pounds apart in the lower weights, a rounding error in the conversion can put a fighter in the wrong class.

Formulas

Division

division = the lowest class whose pound limit is greater than or equal to the fighter's weight in pounds

Conversion

pounds = kilograms x 2.2046226

Worked example

With the default values below, Boxing Weight Class Calculator returns Division of Middleweight. Change any input above and every figure here is recalculated in your browser.

Inputs used

Weightminimum 20 kg
70 kg
Report limits inone of Kilograms, Pounds
Kilograms

Results

Division
Middleweight
Division upper limit
72.57
Margin below the limit
2.57
Weight in pounds
154.32 lb

Step by step

  1. 1Values used
  2. 2Division
  3. 3Conversion
  4. 4Division= Middleweight
  5. 5Division upper limit= 72.57
  6. 6Margin below the limit= 2.57
  7. 7Weight in pounds= 154.32 lb

Assumptions and limits

  • The result is derived only from the 2 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.

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

Frequently Asked Questions

How is the Boxing Weight Class figure worked out?

division = the lowest class whose pound limit is greater than or equal to the fighter's weight in pounds. Professional boxing limits are defined in pounds, so the weight is converted at 2.2046226 lb per kg and matched to the lowest division whose limit it does not exceed.

Why does this matter?

Because the divisions are only a few pounds apart in the lower weights, a rounding error in the conversion can put a fighter in the wrong class.

What do I need to enter?

Enter weight, report limits in. The defaults shown are a realistic worked example — swap in your own figures to get a result you can use.

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