Calculate percentages instantly — what % is X of Y, percentage change, and more.
This percentage calculator handles the three calculations people need most: finding a percentage of a number, working out what one number is as a percentage of another, and calculating a percentage increase or decrease. Enter your figures and the answer updates instantly.
Percentages come up everywhere — discounts and sales, tips, tax, interest, marks and statistics. This tool saves you the mental maths and helps you double-check figures quickly and accurately.
Percentages come up constantly in Australian money decisions: GST is 10 percent, sale discounts are quoted as percentages off, pay rises and interest rates are percentage changes, and super contributions are a percentage of salary. This calculator handles the three classic percentage questions — what is X% of a number, what percentage one number is of another, and the percentage increase or decrease between two numbers.
A few worked examples. Fifteen percent of $80 is $12 — useful for a quick discount check. If 25 out of 200 customers responded to a survey, that is 12.5 percent. If your rent went from $500 to $550 a week, that is a 10 percent increase.
A GST tip: to add 10 percent GST to a price, multiply by 1.1. To find the GST already inside a GST-inclusive price, divide the total by 11 — not by 10, which is the most common mistake. For dedicated GST work, the GST calculator linked below does this automatically.
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The three percentage calculations you actually need, explained with simple formulas and worked examples, plus the percent vs percentage point trap.
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