BMI Calculator
Formula: BMI = weight(kg) / (height(m))²
Age Calculator
Loan / Mortgage Calculator
Monthly payment formula (amortized): M = P * r / (1 - (1+r)^(-n)), where r = APR/12, n = years*12.
Percentage Calculator
Date Difference Calculator
Note: Months and years are approximate for total counts; exact Y/M/D requires calendar logic.