Calculator library
Calculators
Health and finance tools powered by transparent formulas. Calculator results are deterministic and do not use AI.
Health Calculators
Formula-based tools for body composition, metabolism, and daily energy estimates.
BMI Calculator
Estimate body mass index from weight and height.
healthBMR Calculator
Estimate daily resting calorie needs.
healthTDEE Calculator
Estimate daily calorie needs after activity level.
healthIdeal Body Weight Calculator
Estimate adult ideal body weight from height and sex.
healthBody Fat Calculator
Estimate body fat percentage with a circumference formula.
healthLean Body Mass Calculator
Estimate lean body mass from height, weight, and sex.
healthWaist-to-Height Ratio Calculator
Compare waist circumference with height.
healthTarget Heart Rate Calculator
Estimate an exercise heart rate range with the Karvonen method.
healthCalories Burned Calculator
Estimate exercise calories from MET, weight, and time.
healthMacronutrient Calculator
Convert calorie targets into macro gram targets.
Finance Calculators
Simple planning tools for interest growth, loans, and savings targets.
Compound Interest Calculator
Project investment growth with compound interest.
financeLoan Calculator
Estimate monthly payments for a fixed-rate loan.
financeSavings Goal Calculator
Plan the monthly contribution needed for a target amount.
financeMortgage Calculator
Estimate payments for a fixed-rate mortgage.
financeInvestment Return Calculator
Estimate total and annualized investment return.
financeSimple Interest Calculator
Estimate interest without compounding.
financeDebt Payoff Calculator
Estimate payoff time and interest for a fixed monthly debt payment.
financeRetirement Savings Calculator
Project retirement savings with monthly contributions.
financeInflation Calculator
Estimate how inflation changes future cost and purchasing power.
financeTip Calculator
Calculate a tip and split the total bill.