Utilities Calculators
GPA, discount, tip, and conversion calculators
Utilities
Age by date calculator
Calculate exact age or duration between any two dates in years, months, days, and business days
Utilities
GPA calculator
Calculate GPA on 4.0 scale with weighted/unweighted options and grade point breakdown
Utilities
Subnet calculator
Calculate IP subnet masks, network ranges, usable hosts, and CIDR notation for IPv4 networks
Utilities
Unit converter
Convert between length, weight, temperature, volume, speed, and area units instantly
Utilities
Discount calculator
Calculate sale prices and discount percentages
Utilities
Tip calculator
Calculate tips and split bills among people
Utilities
Temperature converter
Convert between Celsius, Fahrenheit, and Kelvin
Utilities
Cooking converter
Convert cooking measurements between units
Utilities
File format converter
Convert file sizes between different units
Utilities
Color code converter
Convert between hex, RGB, and HSL color formats
Utilities
Time zone converter
Convert time between different world time zones
Utilities
Energy and EV converter
Convert energy units and calculate EV charging costs
Utilities
Password strength checker
Check password strength and estimate crack time
Utilities
Area converter
Convert between square meters, acres, hectares, and more
Utilities
Volume converter
Convert between liters, gallons, cubic feet, and more
About our utilities calculators
Utility calculators handle the small, frequent calculations that are easy to get wrong by hand and tedious to do repeatedly. They are the tools you reach for when you need a fast, reliable answer and then move on.
This category covers conversions, dates, grades, networking, and everyday money tasks. Each tool is designed to be quick to use and clear about what the result means, so you can act on it without second-guessing the arithmetic.
Because these calculations often feed into something else, precision matters. Enter values carefully, keep units consistent, and avoid rounding intermediate results when the number will be used again.
How to choose the right calculator
- Identify the single question you are trying to answer, then pick the tool whose name matches it most closely.
- Gather your inputs first so you can complete the form in one pass without guessing.
- Run more than one scenario to see how sensitive the result is to each value.
- Read the explanation and worked examples to confirm you are interpreting the result correctly.