Tools / Percentage Calculator

Percentage Calculator

Calculate percentages easily. Find X% of Y, what percent X is of Y, percentage change, and increase/decrease by percent.

7,200 AI Tokens Used
Jan 31, 2026 Created
mathcalculator
Categories

What is X% of Y?

What is% of?
Result:—

Example: 15% of 80 = 12

How This Tool Was Built

This tool was created entirely by AI. Here's the exact prompt used to generate it:

Prompt Used 
Create a Percentage Calculator tool with these features:

1. Four calculation modes via tabs:
   - What is X% of Y? (e.g., what is 15% of 200)
   - X is what percent of Y? (e.g., 25 is what % of 200)
   - Percentage change from X to Y (e.g., from 50 to 75)
   - Increase/decrease a value by X% (e.g., 100 + 20%)

2. Real-time calculation as user types
3. Clear result display with large numbers
4. Color coding for increase (green) vs decrease (red) in percentage change
5. Toggle button for increase vs decrease mode
6. Example text showing how each calculation works
7. Clean, tabbed interface

Make it playful and colorful with pink as the accent color.
AI
Claude AI Model
#
7,200 Tokens Used
100%
AI-Generated Code Origin