The race toward miniaturization took a massive leap in 1967 when Texas Instruments unveiled the Cal Tech prototype. It could add, subtract, multiply, divide, print results on paper tape, and astonishingly, fit perfectly in the palm of a hand.

This free online calculator can be used for basic computations such as addition, subtraction, multiplication, division, and square roots.

Free calcsolver and math solver for algebra, trig, fractions, and percentages. No sign-up, no download, works on any Chromebook.

Learn how Google Calendar helps you stay on top of your plans - at home, at work and everywhere in between.

Explore math with our beautiful, free online graphing calculator. Graph functions, plot points, visualize algebraic equations, add sliders, animate graphs, and more.

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Free Scientific calculator - a calculator with advanced features for evaluating exponents, functions, trigonometry and more...

Calendars – online and print friendly – for any year and month and including public holidays and observances for countries worldwide.

This calorie calculator estimates the number of calories needed each day to maintain, lose, or gain weight. Learn the kinds of calories and their effects.

CalcSolver (calc solver, calcsolve) is a free online scientific calculator for algebra, trigonometry, fractions, percentages, and logarithms. No install needed.