Free Online Calculators

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

369 Calculators 16 Categories 100% Free

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38 Calculators

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82 Calculators

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80 Calculators

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25 Calculators

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LED Series Resistor Calculator

#1

Calculate the required series resistor value for an LED circuit using Ohm’s Law.

Electrical & Electronics 5 variants

Rental Yield Calculator

Calculate the gross rental yield percentage of a property based on annual rental income and purchase price.

Financial Calculators 4 variants

Speed Distance Time Calculator

Calculate speed, distance, or time given the other two values using the formula: Distance = Speed × Time.

Math Calculators 10 variants

Concrete Volume Calculator

Estimate the amount of concrete required for slabs, footings, or cylindrical columns with automatic unit conversions.

Construction & Home 4 variants

Total Basal Area Calculator

Calculate the total basal area of a group of trees based on trunk diameter (DBH) and number of trees.

Science & Engineering 4 variants

Conversion Rate Calculator

Calculates the percentage of visitors who complete a desired action.

Business & Retail 4 variants
All Tools Calculators Converters Generators Makers Checkers

Calculators

369 total
Tire Pressure Temperature Adjustment Calculator Estimates the new tire pressure after a temperature change using the ideal gas l...
Travel & Geography
EN
Wind Turbine Power Output Calculator Calculates the theoretical power output of a wind turbine based on air density,...
Science & Engineering
EN
Slope Calculator Computes the slope of a line using the rise over run formula.
Math Calculators
EN
Corrected QT Interval (QTc) Calculator Calculates the corrected QT interval (QTc) using Bazett’s formula to adjust QT f...
Health & Fitness
EN
Annuity Due Payment Calculator Calculate the periodic payment required for an annuity due where payments are ma...
Financial Calculators
EN
Brick Quantity Calculator Calculate the total number of bricks required to build a rectangular wall based...
Construction & Home
EN
Relative Risk (RR) Calculator Calculates the Relative Risk (RR) to compare the risk of an outcome between expo...
Statistics & Probability
EN
Future Value of Ordinary Annuity Calculator Calculates the future value of an ordinary annuity with fixed payments made at t...
Financial Calculators
EN
Fence Installation Cost Calculator Calculate the total cost of installing a fence around a rectangular property bas...
Construction & Home
EN
Salary Increase Percentage Calculator Calculates the percentage increase between an old salary and a new salary.
Financial Calculators
EN
Density Altitude Calculator Estimates aircraft density altitude based on pressure altitude and outside air t...
Travel & Geography
EN
Ordinary Annuity Payment Calculator Calculates the required periodic payment to reach a target future value using a...
Financial Calculators
EN