Some sums are faster to type than to do in your head — and easier to trust. This category gathers clean, no-nonsense calculators for the math that comes up at work, at school and around the house: percentages, areas, proportions and full scientific functions.

No clutter, no ads in the way — just type the numbers and get the answer.

Tools in this category#

• Percentage Calculator — Find a percent of a number, a ratio as a percentage, or a percentage change.
• Scientific Calculator — Trigonometry, logarithms, powers, roots and constants.
• Area Calculator — Calculate the area of rectangles, circles, triangles and more.
• Rule of Three — Solve direct and inverse proportions instantly.
• Simple Calculator — A fast online calculator for everyday math.
• Trigonometric Functions — Compute sine, cosine and tangent of an angle.

The right calculator for the job#

Working out a discount or a tip? The percentage calculator. Scaling a recipe or a mix? The rule of three. Measuring a room for flooring or paint? The area calculator. Studying or doing engineering work? The scientific calculator has the functions you need.

Tip: for money questions like loans, savings and tax, head to the Finance category — those calculators are tuned for exactly that.