Question 1

What is the basic formula for percentage calculations?

Accepted Answer

The basic formula is: Percentage = (Part ÷ Whole) × 100. This tool offers three modes: (1) X% of Y = Y × X ÷ 100, (2) X is what % of Y = X ÷ Y × 100, (3) % Change = (New Value - Old Value) ÷ Old Value × 100.

Question 2

How do I calculate discounts?

Accepted Answer

Use the 'What is X% of Y?' mode. For example, for a $100 item with 20% off, enter 20 as the percentage and 100 as the value. The result shows $20 discount, so the final price is $100 - $20 = $80.

Question 3

How do I calculate percentage increase or decrease?

Accepted Answer

Use the '% Change' mode. Enter the original value in 'From' and the new value in 'To'. For example, if sales grew from $5,000 to $6,000, the increase is (6000-5000)÷5000×100 = 20%. Negative results indicate a decrease.

Question 4

Can I use this for sales tax calculations?

Accepted Answer

Yes! For a 10% sales tax, use 'X% of Y' mode with 10 as the percentage and the pre-tax price as the value. The result shows the tax amount. Add it to the original price for the total with tax.

Percentage Calculator

Common Percentages

Frequently Asked Questions

Other Useful Tools

WebP Converter

File Size Converter

UUID Generator

Cooking Converter