Percentage & Discount
Everyday math in one place: percent change between two numbers, sale discounts, reverse-engineer pre-sale price from a discount, tips, and markup from cost to retail.
Estimates only — not financial advice.
1Input Details
Percent change
Discounts
Apply a discount
€
%
Reverse: sale price → original
Uses the discount percent above. Enter the sale price to find the original.
€
Tip
€
%
Markup
€
%
How it works
How to use
- Percent change: enter an old and new number to see the % move.
- Discounts: enter list price and discount % for sale price and savings; optional reverse mode backs out list price from sale price.
- Tip / markup: bill + tip percent, or cost + markup percent for a retail price.
How it works
- Percent change = (new − original) ÷ original × 100.
- Discounted price = original × (1 − discount%). Reverse: original = sale price ÷ (1 − discount%).
- Tip: tip = bill × tip%; total = bill + tip. Markup: retail = cost × (1 + markup%).