Free online calculators & converters
Handle a quick calculation, compare measurements or work with dates without opening a spreadsheet. The scientific calculator supports expressions and trigonometry; the unit converter makes source and destination units explicit. Date helpers count days between dates and convert calendar formats with clear input labels. Choose the matching mode first, check the input labels, and confirm the result before copying it into a form.
Scientific calculator
Everyday maths, powers, roots and trigonometry.
Open Scientific calculator →Unit converter
Convert length, weight, temperature, area and volume.
Open Unit converter →Age calculator
Calculate age in years, months and days.
Open Age calculator →Nepali date converter
नेपाली ↔ English · BS to AD and back.
Open Nepali date converter →Aspect ratio calculator
Find a ratio and resize dimensions without stretching.
Open Aspect ratio calculator →Percentage & discount
Work out a discount, percentage or percentage change.
Open Percentage & discount →Bill splitter
Share a bill fairly, with an optional tip.
Open Bill splitter →Date difference
Count days between dates, with an inclusive option.
Open Date difference →Focus timer
Set a simple countdown for work, study or a break.
Open Focus timer →