A new equation was developed to predict body fat percentage using BMI for people with intellectual disabilities. The researchers studied 119 participants and found that gender did not affect BMI or body fat percentage. Age was not a significant factor. The equations for predicting body fat percentage were created using BMI and gender. The prediction equation was highly effective in cross-validation, with an R2 of .76 for DEXA and .85 for BIA. This equation should be used for individuals with intellectual disabilities to estimate body fat percentage accurately.