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Percentage Calculator

Work out locally how much a percentage of a value is - plus increased and decreased, no upload.

This calculator gives a non-binding, model-based estimate and is not financial, tax or legal advice. More in the disclaimer
Percentage Scale as a percentage of the original size. 50 % halves, 200 % doubles.
Base value

Result

20
Percentage value
120
Increased
80
Decreased
No upload100% local
Your content stays with youno third-party access
Servers in GermanyGDPR by design
Independently auditedTLS A+ · HTTP headers A+
Is my file uploaded?

No. Everything runs in your browser - your file never leaves your device. How this is verifiable

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.

Specifications

Specifications
Input formatsForm inputs (no file)
ProcessingLocally in your browser (JavaScript)
File uploadNone

In 3 steps

  1. Enter the percentage.
  2. Enter the base value.
  3. 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.

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