Calculate percentages, loans, margins, and more instantly.
4 free tools — 100% client-side, no uploads
Easily calculate percentages, increases, and differences.
Determine the final price of an item after applying a discount.
Calculate gross margin and markup percentages.
Calculate your exact age in years, months, and days.
Calculate percentages, loans, margins, and more instantly. All tools run entirely in your browser using client-side JavaScript. Your data never leaves your device — no server uploads, no tracking, no accounts required. Bookmark this page to access all 4 tools instantly.