Percentage Calculator

Percentage Calculator

Percentages are used everywhere — from discounts and tips to interest rates and statistics. Understanding how to calculate percentages helps you make better financial decisions.

Key Terms

• Percentage — A fraction of 100, represented by the symbol %.
• Base Value — The whole amount you're calculating a percentage of.
• Rate — The percentage being applied.
• Part — The portion of the base value represented by the percentage.

Common Percentage Formulas

Common Uses

• Discounts — Calculate sale prices and savings
• Tips — Calculate gratuity at restaurants
• Tax — Calculate sales tax or income tax
• Interest — Calculate loan or investment interest
• Change — Calculate percentage increase or decrease

Tips for Percentage Calculations

• To find 10% of any number, move the decimal point one place left
• To find 5%, find 10% and divide by 2
• To find 15%, find 10% and add half of it
• Percentage increase and decrease use the same formula: (New - Old) / Old × 100
• A 50% increase followed by a 50% decrease doesn't return to the original value