Everyday Tools
Quick calculators for dates, ages, grades and percentages. They run in your browser and update instantly. Looking for money tools? See the finance calculators. Need to convert units? Try the converters.
Percentage Calculator
Calculate percentages, percentage change, or find the original value.
Age Calculator
Calculate your exact age in years, months, weeks, and days from your date of birth.
GPA Calculator
Calculate your GPA by entering your course grades and credit hours. Supports letter grades and 4.0 scale.
Date Difference Calculator
Calculate the number of days, weeks, months, and years between two dates.
Percentage Change Calculator
Calculate percentage increase or decrease between two values. Also computes percentage of a number and reverse percentage.
Hours Worked Calculator
Calculate total hours worked between a start time and end time, with optional break deduction. Great for freelancers, contractors, and hourly employees.