Question 1

What are the three calculation modes?

Accepted Answer

% of number finds a percentage of a value (e.g. 20% of 150 = 30). "What % is X of Y" finds the ratio (e.g. 30 is 20% of 150). % change finds the increase or decrease between two values.

Question 2

How is percentage change calculated?

Accepted Answer

Percentage change = ((new value - original value) / original value) × 100. A positive result is an increase, negative is a decrease.

Question 3

What does a negative percentage change mean?

Accepted Answer

A negative percentage change means the value decreased. For example, going from 100 to 80 is a -20% change.

Question 4

Can I use decimals?

Accepted Answer

Yes. All input fields accept decimal numbers for precise calculations.