Sumvia

Online Calculator

A free scientific calculator that runs entirely in your browser — no account, no installs, and nothing you type is sent to a server. Use the keypad or your keyboard, and find the Percentage Calculator further down the page. Every tool in the directory has its own page with formulas, worked examples, and FAQs.

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Supports degrees and radians, parentheses, powers and roots, logarithms, factorials, memory (M+, M−, MR), and answer recall (Ans). Keyboard entry works for digits and operators; press Enter for equals and Escape to clear. Full guide on the Scientific Calculator page.

Percentage Calculator

Find a percentage of a number, express one number as a percentage of another, measure a percentage increase or decrease, or add and subtract percentages — results appear as you type. For the formulas, eight worked examples, common mistakes, and the FAQ, see the full Percentage Calculator page.

What is X% of Y?

Find a percentage of a number. Example: 15% of 200 is 30.

Enter a percentage and a number to see the result.

X is what percent of Y?

Express one number as a percentage of another. Example: 30 is 15% of 200.

Enter both numbers to see the percentage.

Percentage increase or decrease

Measure the change between two values. Example: from 80 to 100 is a 25% increase.

Enter the original and new values to see the percentage change and difference.

Add or subtract a percentage

Increase or decrease a value by a percentage. Example: 75 increased by 18% is 88.5.

Operation

Enter a starting value and percentage to see the adjustment and final value.