Solve percentages and ratios without the mental math
This calculator covers the everyday percentage problems people actually search for: what percent one number is of another, percentage increase or decrease, adding or removing a percentage, and simplifying or scaling ratios. Type the numbers and read the answer — no formula recall required.
Practical for finance, study, and cooking
Whether you're checking a discount, computing a tip, converting a test score, adjusting a recipe, or comparing two figures, the tool shows the result and the relationship behind it. Because it runs entirely client-side, it's fast and works offline once the page has loaded.
Features
- 01
- Five modes: % of value, X-is-what-%, % change, add/subtract %, ratio split
- 02
- Multi-part ratio splitter (3:2:1 and beyond) with stacked bar chart
- 03
- Percentage increase and decrease with absolute change and growth factor
- 04
- Every result shows the underlying formula for learning and checking
- 05
- Live updates as you type — no calculate button needed
