Everyday
Dates, units, construction materials, grades and household sums.
Date and Time
Age Calculator
Exact age in years, months, weeks and days.
Date Calculator
Add or subtract years, months and days from a date.
Time Calculator
Add or subtract hours and minutes from a time.
Hours Calculator
Hours and minutes between a start and an end date and time.
Time Card Calculator
Hours worked from a shift, with breaks and overtime.
Time Zone Calculator
Convert a time from one zone to another.
Time Duration Calculator
The span between two times of day.
Day Counter
Days between two dates, including working days.
Day of the Week
Which weekday a date falls on, and the week number.
Men and Women
Housing and Building
Concrete Calculator
Volume and bag count for a concrete slab.
Square Footage Calculator
Area of a room, floor or plot.
Tile Calculator
How many tiles and boxes a surface needs.
Mulch Calculator
Mulch volume and bag count for a bed.
Gravel Calculator
Gravel tonnage for a driveway or path.
Roofing Calculator
Roof area and sheet count after pitch.
Stair Calculator
Riser and tread count for a total rise.
BTU Calculator
Cooling or heating capacity a room needs.
Paint Calculator
Litres of paint for a room, minus doors and windows.
Wallpaper Calculator
Rolls needed, allowing for pattern repeat.
Internet
IP Subnet Calculator
Network address, mask and usable hosts from a CIDR block.
Password Generator
Strong random passwords made in your browser.
Bandwidth Calculator
How long a file takes to download.
Base64 Encode / Decode
Convert text to Base64 and back again.
URL Encode / Decode
Escape text for safe use in a web address.
Transportation
Weather
Electronics and Circuits
More in Everyday
GPA Calculator
Grade point average from a list of course grades.
Grade Calculator
Percentage score and letter grade for an assessment.
Tip Calculator
Tip, total and the split between people.
Density Calculator
Density from mass and volume.
Speed Calculator
Speed from distance and time, in every unit.
Molarity Calculator
Concentration from moles and solution volume.
Roman Numeral Converter
Convert numbers to Roman numerals and back.
Conversion Calculator
Convert length, mass and volume units.
Dice Roller
Roll any combination of dice.