Question 1

How do I calculate a percentage of a number?

Accepted Answer

Use 'What is X% of Y?' mode. Enter the percentage (X) and the number (Y). The calculator shows the result. For example, 20% of 100 = 20. Formula: (Percentage ÷ 100) × Number.

Question 2

How do I calculate percentage increase or decrease?

Accepted Answer

Use 'Increase/Decrease' mode. Enter the original value and new value. The calculator shows the percentage change. Positive = increase, negative = decrease. Formula: ((New - Old) ÷ Old) × 100.

Question 3

How do I add a percentage to a number (like tip or tax)?

Accepted Answer

Use 'Add X% to Y' mode. Enter the percentage (X) and the base number (Y). The calculator shows the result with the percentage added. For example, adding 15% tip to $100 = $115. Formula: Number + (Number × Percentage ÷ 100).

Question 4

How do I find what percentage one number is of another?

Accepted Answer

Use 'X is what % of Y?' mode. Enter both numbers. The calculator shows what percentage the first number is of the second. For example, 25 is 25% of 100. Formula: (First Number ÷ Second Number) × 100.

Question 5

Can I save my recent percentage calculations?

Accepted Answer

Yes! The calculator automatically saves your recent calculations. They appear in the help panel for quick access. Click on any recent calculation to reuse those values. This is helpful for repeated calculations or comparing different scenarios.

Percentage Calculator

When Should You Use This Calculator?

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