Math
Percentage Calculator: Tips, Discounts, VAT & More
How to calculate percentages for discounts, tips, VAT/GST, and percentage changes — with a free instant calculator.
Six percentage calculations you need
The ToolCrix Percentage Calculator covers these everyday use cases:
1. Percentage of a number
What is 15% of £240? → £36.
2. Percentage change
Price went from £50 to £65 → +30%.
3. Tip calculator
£85 bill + 20% tip ÷ 4 people → £25.50 each.
4. Discount / sale price
£120 item, 35% off → £78. Saving → £42.
5. VAT / GST
Add 20% VAT to £200 net → £240 gross. Reverse: VAT from £240 → £40 VAT, £200 net.
6. What percentage is X of Y?
45 out of 60 = 75%.
Quick mental math shortcuts
- 10% — move decimal point one left.
- 5% — halve the 10% figure.
- 20% — double the 10% figure.
- 15% — add 10% + 5%.