#1 Free Scientific Calculator 2025
Enter number(s), select an operation, then click "Calculate". For unary operations, only the first number is used. Angles for trigonometric functions are in Radians.
#1 Free Basic Calculator (Addition, Subtraction, Multiplication, Division) 2025
Enter two numbers, select an operation, then click "Calculate".
#1 Free Length Converters (e.g., meters to feet, cm to inches, km to miles) 2025
Enter a length value, select the original unit and the unit to convert to, then click "Convert".
#1 Free Area Converters (e.g., sq ft to acres, sq m to hectare) 2025
Enter an area value, select the original unit and the unit to convert to, then click "Convert".
#1 Free Volume Converters (e.g., gallons to liters, cubic m to cubic ft) 2025
Enter a volume value, select the original unit and the unit to convert to, then click "Convert".
#1 Free Mass/Weight Converters (e.g., pounds to kilograms, grams to ounces) 2025
Enter a mass/weight value, select the original unit and the unit to convert to, then click "Convert".
#1 Free Temperature Converters (Celsius, Fahrenheit, Kelvin) 2025
Enter a temperature value, select the original unit and the unit to convert to, then click "Convert".