4 Percent allows you to calculate percentages

- simple percentage calculator
- percentage increase/decrease
- tip calculator
- Price vs. quantity calculator
- discount calculator

Business calculators
- markup & margin calculator
- compound interest
- cumulative growth
- VAT
- Sales tax

Percentage Calculator is useful in many situations:
- school (math, statistics, algebra)
- business and finance (markup, profit margin, cumulative growth, compound interest).
- shopping (discounts, comparison of two products that differ in quantity)
- cooking (ingredients are often shown in percentages)
- health (BMI index, fat percentage in food)