How do I calculate a 20% discount?
Multiply the original price by 0.20 to get the discount amount, then subtract from the original. Example: £80 × 0.20 = £16 off, so final price = £64.
What is the formula for discount price?
Final Price = Original Price × (1 − Discount% / 100). Or: Discount Amount = Original Price × (Discount% / 100).
Can I calculate the original price from a discounted price?
Yes — use: Original Price = Discounted Price ÷ (1 − Discount%/100). If you paid £60 after a 25% discount: 60 ÷ 0.75 = £80 original.
Is this calculator free?
Yes — free, no signup, works on mobile and desktop.