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.

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