Calculation Guide
Learn the logic behind date, percentage, and unit calculations.
Date Calculation Basics
Date calculations count days between two dates, add days, or subtract days using calendar math including leap years.
Percentage Calculations
- What is X% of Y? → (X/100)*Y
- X is what % of Y? → (X/Y)*100
- Percentage change → ((New-Old)/Old)*100
Unit Conversion Logic
Conversions use fixed mathematical ratios between units. Results are precise and based on international standards.
How NumTool Calculates
All tools use pure JavaScript in your browser. Results are computed instantly with high precision and no server delay.
Common Use Cases
- School assignments and math homework
- Business finance and discounts
- Project timelines and deadlines
- Cooking, measurements, and DIY projects