Math & Everyday Calculators
Percentages, dates, grades, and the quick arithmetic that comes up daily. All 6 are free, work in your browser, and explain the formula behind the result.
Percentage Calculator
Every common percentage question in one place.
OpenAge Calculator
Exact age in years, months, days, and total units.
OpenDate Difference Calculator
Days between two dates, with or without weekends.
OpenGPA Calculator
Weighted GPA from course grades and credit hours.
OpenFraction Calculator
Add, subtract, multiply, and divide fractions.
OpenAverage Calculator
Mean, median, mode, range, and standard deviation.
Open