Category / 18 tools
Everyday calculators
Age, dates, fuel cost, and discounts.
Unit Price Calculator
Cost per unit so you can compare which package is the better deal.
Dog Age Calculator
Convert a dog's age into human-equivalent years.
Age Calculator
Your exact age in years, months, and days.
Date Difference Calculator
The number of days between two dates.
Fuel Cost Calculator
The fuel cost of a trip from distance, MPG, and gas price.
Discount Calculator
The sale price and savings after a percent-off discount.
GPA Calculator
Your grade point average from letter grades and credit hours.
Sleep Cycle Calculator
Bedtimes that let you wake at the end of a sleep cycle.
Electricity Cost Calculator
What an appliance costs to run per day, month, and year.
Generator Wattage Calculator
Generator size you need from your running and starting loads.
Water Bill Calculator
Estimated water cost from daily usage and your rate.
Roman Numeral Converter
Convert a number (1-3999) to Roman numerals.
Password Strength Calculator
Estimate a password's entropy and crack time.
Random Number / Dice Roller
Roll dice or generate a random number in a range.
Reading Time Calculator
How long a piece of text takes to read at your pace.
Coin Flip Probability Calculator
Odds of getting at least one heads across a number of fair coin flips.
Tank Volume Calculator
Gallons in a rectangular or cylindrical tank from inside dimensions.
Download Time Calculator
How long a file takes to download at your connection speed.