BMR Calculator
Estimate BMR in kcal/day from age, sex, height, and weight, with optional body fat and formula comparison.
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Body Fat Calculator
Estimate body fat %, fat mass, lean mass, BMI, and compare U.S. Navy and BMI-based results in US or metric units.
Target Heart Rate Calculator
Estimate your exercise heart-rate zone with a simple age-based method or a more personalized heart rate reserve method.
One Rep Max Calculator
Estimate your 1RM from weight and reps, compare formulas, and get a practical percentage load table in lb or kg.
Calories Burned Calculator
Estimate calories burned from weight, activity, time, and MET with preset activities or a custom MET option.
Calorie Calculator
Estimate maintenance calories, weight-loss or weight-gain targets, and time to a target weight with adult-use guardrails.
BMI Calculator
Calculate BMI in US or metric units, see the adult category, and view a healthy weight range for your height.
Right Triangle Calculator
Solve a right triangle from sides or angle inputs. Get missing sides, acute angles, area, and perimeter with clear checks.
Fraction Calculator
Add, subtract, multiply, divide, compare, convert, and simplify fractions and mixed numbers with clear exact and decimal results.
Surface Area Calculator
Find total or lateral surface area for common 3D shapes, with formulas, unit choices, and clear area breakdowns.