ROI Calculator
Calculate return on investment, net gain or loss, and annualized ROI percentage.
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Quadratic Formula Calculator
Solve quadratic equations with the quadratic formula. Find roots, discriminant, and vertex.
Savings Goal Calculator
Calculate how long to reach your savings goal with monthly contributions and interest.
Ideal Weight Calculator
Estimate ideal body weight using Robinson, Miller, Devine, and Hamwi formulas.
Days Until Calculator
Count exact days until any future date, or days since a past date.
Sales Tax Calculator
Add tax to a price, reverse-calculate pre-tax from a total, or find the tax rate.
Statistics Calculator
Calculate mean, median, mode, standard deviation, and more from any data set.
Exponent Calculator
Calculate powers, roots, squares, cubes and nth roots — the E in GEMS.
Body Fat Calculator
Estimate body fat percentage using the U.S. Navy circumference method.
GPA Calculator
Calculate your GPA on a 4.0 scale with multiple courses and credit hours.