Historical McCulloch coefficients
This calculator uses the Masters Age Multiples table in the BDFPA 2013 Handbook, Amendment 1, page 82. It is a versioned historical lookup for whole-number ages 40 through 80, not a fitted age curve or a claim about current federation rules.
Age-adjusted score = unadjusted score × historical McCulloch coefficient
The table gives 1.000 at age 40, 1.060 at 45, 1.380 at 60 and 2.100 at 80. For example, an unadjusted score of 350 at age 45 becomes 371.000. Results show three decimal places.
Choose the correct base score
The cited handbook applies the multiplier after the lifter’s total is multiplied by the Schwartz bodyweight coefficient for men or Malone coefficient for women. Enter that unadjusted product when reproducing this historical method. Multiplying an unrelated scoring system does not establish a valid competition result.
Check the rules of your federation and the edition used by your meet before applying an age adjustment. This page does not supply junior coefficients, infer values between birthdays or extrapolate beyond the published age range.