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Percentages are part of everyday life: tax, tips, interest, surcharges, reductions. This calculator answers the basic question "how much is P percent of a value?" and shows three figures: the percentage value itself, the value increased by that share and the value decreased by that share. So you see at a glance not only the share but also where the value ends up with a surcharge or a reduction.
The calculation runs entirely locally in your browser, in pure JavaScript - nothing is uploaded and nothing is stored. The percentage value is the base times the percentage divided by 100; the increased value is base plus the percentage value, the decreased value base minus the percentage value. The results are plain numbers - they can stand for euros, items, kilograms or any unit. Change an input and everything updates instantly.
An honest note: this is the basic "percentage of a value" calculation. Other percentage questions are better served by dedicated tools - a discount with the discount calculator, net/gross with the VAT calculator, interest over time with the compound-interest calculator. The results are unitless numbers; you decide what they mean.
A common pitfall: percent and percentage points are not the same. If an interest rate rises from 2 to 3 percent, that is one percentage point more but a full 50 percent increase. This calculator answers the plain share question; whether you read the result as points or as a relative rise depends on the context - for a change between two values the percentage-change calculator is the right tool.
Specifications
Specifications
Input formats
Form inputs (no file)
Processing
Locally in your browser (JavaScript)
File upload
None
In 3 steps
Enter the percentage.
Enter the base value.
Read off the percentage value, the increased and decreased value.
Limitations: The basic "percentage of a value" calculation; the results are unitless numbers whose meaning you set yourself. Other percentage questions (discount, net/gross, interest over time) are handled by the matching calculators. Not advice.
FAQ
Are my inputs uploaded?
No. The calculation runs entirely locally in the browser (pure JavaScript); nothing is sent or stored.
How do I work out "P percent of X"?
Percentage value = base times percentage divided by 100. Example: 20 % of 100 is 20.
What do increased and decreased mean?
Increased is the base plus the percentage value (a surcharge), decreased is the base minus the percentage value (a reduction).
What unit is the result in?
In none fixed - the results are plain numbers. You decide whether they mean euros, items or something else.