Free Online Calculators

From BMI to loans, tips to age — instant calculations at your fingertips.

367 Calculators 16 Categories 100% Free

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6 Calculators

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Date Difference Calculator

#1

Calculate the difference between two dates.

Date & Time 5 variants

Acceleration Calculator (a=Δv/t)

Calculate acceleration, velocity change, or time using a=Δv/t. Perfect for kinematics and motion problems.

Science & Engineering 5 variants

Standard Error Calculator

Calculates the standard error of the mean (SEM) using sample standard deviation and sample size.

Statistics & Probability 5 variants

Contribution Margin Calculator

Calculates the contribution margin per unit by subtracting variable cost per unit from selling price per unit.

Business & Retail 4 variants

Brick Quantity Calculator

Calculate the total number of bricks required to build a rectangular wall based on wall and brick dimensions.

Construction & Home 4 variants

Slope Calculator

Computes the slope of a line using the rise over run formula.

Math Calculators 4 variants
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367 total
BUN-to-Creatinine Ratio Calculator Calculates the Blood Urea Nitrogen (BUN) to Creatinine ratio to help assess kidn...
Health & Fitness
EN
GDP Per Capita Calculator Calculate Gross Domestic Product (GDP) per capita using total GDP and total popu...
Business & Retail
EN
Simple Interest Rate Calculator Calculates the annual interest rate based on principal amount, total interest ea...
Financial Calculators
EN
Free Water Deficit Calculator Estimates the amount of free water (in liters) needed to correct hypernatremia.
Health & Fitness
EN
Hotel Occupancy Rate Calculator Calculates the percentage of occupied rooms over a given period.
Business & Retail
EN
EBITDA Multiple Business Valuation Calculator Estimates business value using the EBITDA multiple method.
Business & Retail
EN
Molarity Calculator Calculates the molar concentration (molarity) of a solution based on mass, molar...
Chemistry & Biology
EN
Population Density Calculator Calculate the population density of a region based on total population and total...
Statistics & Probability
EN
Ellipse Circumference Calculator (Ramanujan Approximation) Computes the approximate circumference (perimeter) of an ellipse using Ramanujan...
Math Calculators
EN
Topsoil Calculator Estimate the amount of topsoil needed in cubic yards for a rectangular area.
Construction & Home
EN
Work Hours Required Calculator Calculate how many work hours are needed to afford a specific item based on hour...
Financial Calculators
EN
Heat Energy Calculator Calculate the amount of heat energy required to change the temperature of a subs...
Science & Engineering
EN