Calculators
8 free tools that run entirely in your browser. Each one comes with a plain-English explanation, worked examples and answers to common questions.
Tip Calculator Work out the tip and split any bill in seconds. Time Card Calculator Add up a week of hours, breaks, overtime, and pay in seconds. Percentage Calculator Find a percentage, a share, or a percent change in seconds. GPA Calculator Turn your letter grades and credits into a weighted 4.0 GPA. Age Calculator Find your exact age in years, months, and days from any date of birth. Date Calculator Count the days between dates, or add and subtract from any date. Fraction Calculator Add, subtract, multiply, and divide fractions with reduced results. Pregnancy Due Date Calculator Estimate your due date and gestational age from your last period.