Percentages are everywhere in business: discount rates, VAT, margins, growth numbers, commissions, market share. Computing them in your head is error-prone — what is 17.5% of 1,287? This calculator answers the three percent questions in one tool: what is X% of Y (a discount, a commission, a tax), X is what percent of Y (achievement against target, share of revenue), and percentage change (this month against last). The change calculation keeps the real asymmetry — 200 to 250 is +25%, but 250 back to 200 is −20% — because the base changed, and hiding that is how growth numbers mislead.
Step 1. Pick the calculation type — a portion, a ratio, or a change; the two input labels change to match.
Step 2. Enter the two numbers.
Step 3. Click Calculate and read the result — percentage change reports positive for an increase and negative for a decrease.
Open the free Free Percentage Calculator now, or browse the full business calculator suite.
