Percentage Calculator Studio

Percentages show up everywhere — discounts, tax, tips, markups, grades and growth rates — and each one is calculated slightly differently. This free studio puts the four everyday calculations on one screen: percentage of a number, percentage change, reverse percentage (finding the original price before tax or markup), and a tip and tax helper with the true total. Download it once and it works offline forever, with no ads and no signup.

WHAT IT DOES
• Percentage of a number — what is 15% of 240, answered instantly with the remainder shown too
• Percentage change — increase or decrease from one value to another, with the direction labelled
• Reverse percentage — a price after tax or markup traced back to the original amount
• Tip & tax helper — the extra amount and the true total to pay, in one view
• All four calculators on one screen — no page-hopping between single-purpose sites
• 100% free and 100% offline — no signup, no ads, nothing leaves your browser

HOW TO USE
1. After checkout, download the ZIP and unzip it.
2. Double-click percentage-calculator-studio.html — it opens in any modern browser, no install, no signup.
3. Enter your details, use the tool, and copy / save / export your results.

WHO IT’S FOR
Digital nomads, online sellers, freelancers, creators and solo business owners who want a practical tool they own outright — no subscription, no login, no data leaving their machine.

WHAT YOU GET
• percentage-calculator-studio.html — the complete tool in the downloadable ZIP (works offline, yours forever)
• Free lifetime updates to the file
• Instant download after checkout