Free Online Calculators

Accurate, easy-to-use calculators for all your needs. From basic math to complex engineering calculations.

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Featured Calculators

Our most popular tools

Calculate your Body Mass Index and understand your health status

Calculate the correct resistor value for LED circuits

Calculate percentages, discounts, and percentage changes

Browse by category to find what you need

BMI, age, and health-related calculators

BMI Calculator Age Calculator

Resistor, voltage, and electronic component calculators

LED Resistor SMD Resistor Resistor Color Voltage Divider AWG Wire Antenna

Area, volume, and mathematical calculations

Area Calculator Volume Calculator Brick Calculator Unit Converter

Financial and business calculators

Percentage Compound Interest

Building and construction calculators

Flooring Calculator

Word counting and text analysis tools

Word Counter Unique Word Counter Leetspeak

Image processing and conversion tools

Image to MCU Array