Free online calculators
Fast, accurate answers with the formulas and assumptions shown. No registration, no uploads and no hidden steps.
MathScientific CalculatorUse a fast standard and scientific calculator for arithmetic, powers, roots and trigonometry. Works privately in your browser. EverydayAge CalculatorCalculate exact age from a date of birth in years, months and days, plus total days and the next birthday countdown. EverydayDate CalculatorFind days between two dates or add and subtract days, weeks, months and years from any calendar date. EverydayTime CalculatorCalculate the duration between two times or add and subtract hours, minutes and seconds with overnight support. MathPercentage CalculatorCalculate a percentage of a number, percentage increase or decrease, and percentage change between two values. MathAverage CalculatorFind the mean, median, mode, range, count and sum for a list of numbers instantly. DeveloperIPv4 Subnet CalculatorCalculate an IPv4 network address, subnet mask, broadcast address, host range and usable hosts for any CIDR prefix. DeveloperFile Transfer Time CalculatorEstimate upload or download time from file size and connection speed with clear decimal and binary unit handling.