Result
30

20% of 150 is 30. Formula: (X × Y) ÷ 100

Quick answer

How to use the free Percentage Calculator

To calculate percentages for free, pick a mode (X% of Y, % change, tip, discount, VAT), enter your numbers, and the result appears instantly. Six calculators in one, all local.

Free percentage calculator — six modes in one

Calculate percentages, discounts, tips, VAT/sales tax and percentage change — all from a single clean interface. Six calculator modes cover every common percentage question. Instant, private, no sign-up.

How to calculate a percentage

  • Pick the mode that matches your question.
  • Enter your numbers — the result updates instantly.
  • For tips, enter the party size for a per-person split.
  • For VAT, choose to add or remove tax.

Six percentage calculators in one

  • X% of Y — find a percentage of any number (e.g. 20% of 150).
  • What percent — what portion one number is of another.
  • % change — increase or decrease between two values.
  • Tip — calculate and split a restaurant or service tip.
  • Discount — find sale prices after a percentage off.
  • VAT / Tax — add or remove sales tax or VAT from a price.

Why percentages matter every day

Percentages are the most common maths people use — shopping discounts, restaurant tips, tax, grades, pay rises, and comparing numbers. A calculator that handles all six patterns removes the guesswork and stops costly mistakes.

Questions

Frequently asked questions

How do I calculate what is X% of Y?

Multiply Y by X and divide by 100. For example, 20% of 150 is (20 × 150) ÷ 100 = 30. The calculator updates instantly as you type.

How do I find what percentage one number is of another?

Divide the first number by the second and multiply by 100. For example, 30 is what percent of 150? (30 ÷ 150) × 100 = 20%.

How is percentage increase or decrease calculated?

Subtract the old value from the new value, divide by the old value, then multiply by 100. From 80 to 100 is ((100 − 80) ÷ 80) × 100 = 25% increase.

How do I calculate a tip and split the bill?

Multiply the bill by the tip percentage to get the tip, add it to the bill, then divide by the number of people. An 18% tip on a $60 bill split three ways is $23.60 each.

How do I add or remove VAT/GST from a price?

To add VAT, multiply the net price by (1 + rate/100). To remove VAT from a gross price, divide by (1 + rate/100). For 20% VAT, $100 net becomes $120 gross, and $120 gross has a $100 net value.

GuidePercentage Calculator: Tips, Discounts, VAT & MoreRead the full guide →
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