The Suite · 84 Calculators
All free online calculators,
presented for selection.
Filter by discipline or search by name. Every calculator on Best Free Calculators computes live in your browser, copies in one tap, and shares as easily — completely free with no signup.
Basic Calculator
A precise four-function calculator: add, subtract, multiply, divide.
Mortgage Calculator
Estimate monthly principal, interest, taxes, and insurance for a home loan.
Unit Converter
Convert length, weight, and temperature with a single tool.
BMI Calculator
Calculate your Body Mass Index
Age Calculator
Calculate your exact age
Calorie Calculator
Calculate daily calorie needs
Loan Calculator
Calculate loan payments
Tip Calculator
Calculate tip amounts
Discount Calculator
Calculate discounts and savings
Investment Calculator
Calculate investment returns
Percentage Calculator
Calculate percentages
Ratio Calculator
Simplify and scale ratios
Distance Calculator
Calculate 2D and 3D distance
GPA Calculator
Calculate your GPA
Currency Converter
Convert between currencies
Time Units Converter
Convert time units
Statistics Calculator
Calculate statistical measures
Compound Interest Calculator
Calculate compound interest growth
Retirement Calculator
Plan your retirement savings
Tax Calculator
Calculate income and sales tax
BMR Calculator
Calculate Basal Metabolic Rate
Area Converter
Convert area units
Cooking Converter
Convert cooking measurements
Data Storage Converter
Convert data storage units
Temperature Converter
Convert temperature units
Weight Converter
Convert weight units
Length Converter
Convert length/distance units
Volume Converter
Convert volume units
Circle Calculator
Calculate circle properties
Sphere Calculator
Calculate sphere properties
Cylinder Calculator
Calculate cylinder properties
Cone Calculator
Calculate cone properties
Rectangle Calculator
Calculate rectangle properties
Triangle Calculator
Calculate triangle properties using Heron's formula
Water Intake Calculator
Calculate daily water intake
Workout Calculator
Calculate calories burned during workout
TDEE Calculator
Calculate total daily energy expenditure
Blood Pressure Calculator
Evaluate blood pressure readings
Body Fat Calculator
Estimate body fat percentage
Macro Calculator
Calculate macronutrient breakdown
Date Difference Calculator
Calculate difference between two dates
Countdown Calculator
Calculate time until a target date
Timezone Converter
Convert times across timezones
Salary Calculator
Calculate salary breakdown by pay period
Loan Repayment Calculator
Detailed loan amortization breakdown
Pregnancy Calculator
Calculate gestational age, due date, and trimester information
Crypto Converter
Convert cryptocurrency to fiat currencies with static pricing
GCD & LCM Calculator
Calculate greatest common divisor and least common multiple
Prime Number Checker
Check if a number is prime and find adjacent primes
Pythagorean Theorem
Calculate sides of a right triangle using the Pythagorean theorem
Heart Rate Zone Calculator
Calculate target heart rate zones for different exercise intensities
Ideal Body Weight
Calculate ideal body weight based on height and gender
Waist-to-Hip Ratio
Calculate waist-to-hip ratio and health risk category
LDL Cholesterol Calculator
Calculate LDL cholesterol using the Friedewald formula
Fraction Calculator
Add, subtract, multiply, divide, and simplify fractions
Square Root & Powers
Calculate square roots, cube roots, and powers
Standard Deviation
Calculate standard deviation and statistical measures from data
Density Calculator
Calculate density from mass and volume
Z-Score Calculator
Calculate z-score, percentile, and statistical distance from mean
Confidence Interval Calculator
Calculate confidence intervals with t-values for sample means
Force Calculator
Calculate force using Newton's second law and weight
Pressure Converter
Convert pressure between different units (Pa, kPa, atm, bar, psi, mmHg)
Velocity & Acceleration
Calculate velocity, acceleration, distance, or time using kinematic equations
Frequency Converter
Convert frequency between Hz, kHz, MHz, GHz, RPM, and RPS
Angle Converter
Convert angles between degrees, radians, gradians, and other units
Flooring Calculator
Calculate flooring material needed and costs with waste factor
Lumber Calculator
Calculate board feet and lumber costs with waste factor
Kinetic & Potential Energy
Calculate kinetic and potential energy, mechanical energy
Logarithm Calculator
Calculate logarithms in different bases (log₁₀, ln, log₂, custom)
Power Converter
Convert between power units (W, kW, MW, GW, hp, BTU/h, kcal/h)
Paint Calculator
Estimate paint needed, gallons required, and total cost for room painting
Property Tax Calculator
Calculate annual, monthly, and quarterly property taxes
Cube Calculator
Calculate volume, surface area, space diagonal, and face area of a cube
Polygon Calculator
Calculate area, perimeter, apothem, and angles of regular polygons
Recipe Scaler
Scale recipe ingredients based on desired serving size
Fuel Efficiency Calculator
Calculate fuel efficiency, cost per mile, and efficiency rating
Drug Dosage Calculator
Calculate medication dosage based on patient weight
Grade Calculator
Calculate weighted grade average and letter grade
Molar Mass Calculator
Calculate molar mass and elemental composition from chemical formula
pH Calculator
Calculate pH, pOH, and ion concentrations from H⁺, OH⁻, or pH
Work Calculator
Calculate work done using force, distance, and angle (W = F·d·cos θ)
eGFR Calculator
Calculate estimated Glomerular Filtration Rate using the CKDEPI equation
Molarity Calculator
Calculate molarity (M = n/V) and moles (n = M·V) from chemical solutions
TDEE Calculator (Mifflin-St Jeor)
Calculate Total Daily Energy Expenditure using the Mifflin-St Jeor formula