Percentage Calculator

Start with percent change between two values. Switch calculation type for percent-of, percent-difference, or X-is-what-percent-of-Y questions; only the needed fields appear.

Calculation type

Pick the question you want to answer. The form below shows only the fields that mode needs.

Percent-change mode only. The starting value. Must not be zero.
Percent-change mode only. The ending value to compare against the old value.
Percent-of-a-number mode only. For example, enter 15 to compute 15% of the total.
Percent-of-a-number mode only. The base number you're taking a percent of.
Percent-difference mode only. Either value can come first — the result is symmetric.
Percent-difference mode only. The other value to compare with the first.
X-is-what-%-of-Y mode only. The smaller piece, e.g. 30 if you're asking how 30 relates to a whole.
X-is-what-%-of-Y mode only. The reference total. Must not be zero.
Answer +25%
Percent change +25%
Show calculation details
Calculation Percent change