Percentage Toolkit

Ever stared at a receipt trying to figure out if that "40% off" sticker actually beats the other store's deal? Or opened a spreadsheet just to work out your profit margin on a single sale? Percentage Toolkit exists so you never have to do that math by hand — or guess at it — again. This is a focused calculation workspace built around six real-world percentage problems, each with its own dedicated screen designed to match how you'd actually think through it: - Percentage Increase/Decrease — see exactly how much something went up or down, in both percent and raw value, with a clear visual indicator for direction - Discount Calculator — enter a price and a discount, get your final price and exact savings instantly - Markup Calculator — go from cost price to selling price with a chosen markup percentage - Profit Margin Calculator — enter cost and selling price and get margin, markup, and profit shown side by side, so you never confuse the two again - Tax Calculator — toggle between tax-inclusive and tax-exclusive pricing and get the breakdown either way - Ratio Calculator — simplify any ratio and see each part's percentage share of the whole Every result updates live as you type, so you can see your answer take shape before you even hit Calculate. Once you do, every calculation is automatically saved to your history — grouped by date, tap-to-reopen with your original numbers pre-filled, so re-checking or tweaking a past calculation takes seconds. A built-in Guide walks through each mode with a worked example, and an FAQ clears up the questions people actually ask — like why markup and margin never give you the same percentage even with identical numbers. No spreadsheets, no guesswork, no re-deriving formulas from memory — just clean, precise answers to the percentage questions that come up constantly in everyday shopping, budgeting, and business.