InstantToolsPro
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InstantToolsPro
Find percentages, percentage increase or decrease, and what percent one number is of another — instantly, no signup.
Choose % of a number, X is what %, or % increase/decrease.
Type the two numbers relevant to your chosen calculation mode.
The answer updates instantly as you type, with no need to click calculate.
Tap a different tab to switch calculation type without losing your place.
Percentages come up constantly in everyday life – discounts at a store, tax on a bill, marks in an exam, or tracking how much a price or value has changed over time. InstantToolsPro's percentage calculator covers the three most common percentage questions people need answered, switching instantly between modes so you don't have to remember a different formula for each one.
This mode answers the question "what is X% of Y?" – for example, what is 20% of 500? The calculation is straightforward: multiply the number by the percentage, then divide by 100. So 20% of 500 is (20 × 500) ÷ 100 = 100.
This mode flips the question around – instead of starting with a percentage, you have two actual numbers and want to know what percentage one represents of the other. For example, if you scored 50 out of 200 marks, what percentage is that? The formula divides the first number by the second, then multiplies by 100: (50 ÷ 200) × 100 = 25%.
This mode calculates how much something has changed, expressed as a percentage of the original value. The formula is ((New Value − Original Value) ÷ Original Value) × 100. If a price went from 100 to 150, that's an increase of ((150 − 100) ÷ 100) × 100 = 50%. If the new value is smaller than the original, the result comes out negative, correctly indicating a decrease.