General tools
Other Calculators
Browse useful everyday calculators for dates, grades, conversions, construction, utilities, science, travel, and practical planning.
Date & Time
Age Calculator
Calculate age in years, months, days, and total days.
Time Calculator
Add or subtract hours and minutes from a time.
Time Zone Calculator
Convert time between UTC offsets.
Day Counter
Count days between two dates.
Date Calculator
Add or subtract days from a date.
Hours Calculator
Calculate elapsed hours between two times.
Time Duration Calculator
Find duration between two times.
Day of the Week Calculator
Find the day of week for a date.
Education
Conversions
Height Calculator
Convert height between centimeters, inches, and feet.
Conversion Calculator
Convert length, weight, temperature, and volume units.
Shoe Size Conversion
Convert approximate shoe sizes between US, UK, and EU.
Bra Size Calculator
Estimate bra band and cup size from measurements.
Weight Calculator
Convert weight between kilograms and pounds.
Roman Numeral Converter
Convert numbers to Roman numerals.
Technology
IP Subnet Calculator
Calculate subnet mask, host count, and network size from CIDR.
Password Generator
Generate secure random passwords.
Bandwidth Calculator
Estimate file transfer time from size and bandwidth.
URL Encode / Decode
Encode or decode URL text.
Base64 Encode / Decode
Encode or decode Base64 text.
Electrical
Construction
Square Footage Calculator
Calculate square footage from length and width.
Stair Calculator
Estimate stair rise, run, and step count.
Tile Calculator
Estimate number of tiles needed for an area.
Gravel Calculator
Estimate gravel volume and weight.
Concrete Calculator
Estimate concrete volume for a slab.
Roofing Calculator
Estimate roofing area and bundles.
Mulch Calculator
Estimate mulch volume from area and depth.