Percentage calculator
What is X% of Y, what percent is X of Y, and percentage increase or decrease — all in one place.
Last reviewed: August 2026 · Figures are estimates for general planning only — see the explanation below for this calculator's specific assumptions.
Three common percentage questions, one calculator
What is X% of Y? — for example, a 20% tip on a $150 bill: 20% of 150 = 30.
X is what percent of Y? — for example, if you scored 30 out of 150 on a test: 30 is 20% of 150.
Percentage increase or decrease from X to Y — for example, a salary that went from $100 to $150 increased by 50%; one that went from $150 to $100 decreased by about 33.3%. This calculator shows the direction (increase or decrease) automatically based on which number is larger.
Works with any currency, or none
This calculator doesn’t care what the numbers represent — dollars, rupees, points, kilograms, anything. Percentages are just ratios, so the same math applies everywhere in the world.
Frequently asked questions
How do I know which calculation I need?
If you know a percentage and a total and want the resulting amount (like a tip or a discount), use "What is X% of Y?" If you have two amounts and want to know what percentage one is of the other (like a test score), use "X is what percent of Y?" If you have a before-and-after value and want to know how much it changed (like a price or a salary), use "Percentage increase or decrease."
Why is percentage decrease not just the negative of percentage increase?
They use the same formula, but the *base* is different depending on direction — going from 100 to 150 is a 50% increase, but going back from 150 to 100 is only about a 33.3% decrease, not 50%, because the percentage is always calculated against the starting number, and the starting number is different each way.
Does this work with any currency?
Yes — percentages are pure ratios with no unit attached, so this works identically whether your numbers are dollars, euros, rupees, or no currency at all (test scores, percentages of a whole, etc.).
Common questions answered
- What is a 20% discount on $250?
- What is 8% of 1,000?
- What is 20% of 150?
- What percent is 12 of 48?
- What percentage is 7 out of 20?
- What percentage growth is a population going from 10,000 to 11,500?
- What percentage decrease is losing weight from 200 lbs to 180 lbs?
- What percentage decrease is revenue dropping from $50,000 to $42,000?
- What percent is 120 of 800?
- What percentage increase is a stock price going from $40 to $55?
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Anonymous, not linked to any account — based only on real calculations made on this page. Click any entry to see it worked out.