Discount & Sale Price Calculator

Skycally's Discount Calculator answers the three questions shoppers actually type into search: what a percent off calculator gives you, what percentage a sale represents, and what happens when two discounts are applied one after the other. Each mode lives on its own tab and recalculates as you type, so there is no calculate button and nothing to submit. The sale price tab shows the original price struck through next to the new price, with a badge for the percentage saved, exactly the way a shop tag would.

The sale price mode is the classic percent off calculator: enter the original price and the discount, and the tool multiplies by one minus the discount as a fraction. Twenty percent off $100 is $100 × 0.80 = $80, with $20 saved. The reverse mode goes the other way — enter what an item used to cost and what it costs now and the calculator tells you the discount percentage, which is useful for checking whether an advertised sale really is as deep as the sign claims.

The stacked discount calculator is the mode most tools skip. When a store takes 20% off and then applies an extra 15% coupon at checkout, the second discount is calculated on the already reduced price, not on the original. Twenty percent off $100 leaves $80, and 15% off $80 leaves $68 — an effective discount of 32%, not 35%. The tool shows the full chain of prices step by step so you can see exactly where each reduction lands, and spells out the difference against the naive sum in dollars.

Everything runs locally in your browser with plain arithmetic. Nothing you type is uploaded, stored or logged, there is no signup, and every number is formatted in US English so the results look the same on any device. If you need the underlying math in a more general form, the Percentage Calculator handles percentage change and percentage increase, while the Margin Calculator works out what a discount does to your gross margin if you are the one selling.