Percentage Calculator
This tool solves the two most common percentage questions at once: "what percent is X of Y?" and "what is the percentage change from X to Y?" — both update live as you type.
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% change: —
How to Use This Tool
- For "what percent is X of Y", enter both numbers in the top row.
- For percentage change, enter the original and new value in the second row.
- Results update automatically as you type.
Formula
Percentage: (X / Y) × 100
Percentage change: ((New − Old) / |Old|) × 100
Why Use ToolVigo's Percentage Calculator
- Handles both "percent of" and "percentage change" calculations in one tool.
- Live results with no button clicks.
- Correctly signals increase vs. decrease.
Privacy & Security
This tool runs entirely in your browser. Your input is never uploaded to ToolVigo's servers, and nothing is stored once you leave the page.
Frequently Asked Questions
What is the difference between percentage and percentage change?
"Percentage" expresses one number as a proportion of another (e.g. 20 is what % of 150). "Percentage change" measures how much a value has grown or shrunk relative to its original value.
Can percentage change be negative?
The tool always shows the magnitude with a clear "Increase" or "Decrease" label so the direction of change is unambiguous.