Question 1

How do I calculate percentage change?

Accepted Answer

((New - Old) / Old) × 100. From 80 to 100: (100-80)/80 × 100 = 25% increase.

Question 2

Is a drop from 100 to 80 the same as rise from 80 to 100?

Accepted Answer

No. 100 to 80 = 20% decrease. 80 to 100 = 25% increase. Percentage change depends on starting value.

Question 3

How accurate are these calculations?

Accepted Answer

Our calculator uses double-precision floating-point arithmetic, accurate to about 15-16 significant digits for most calculations.

Question 4

Can I use the result in further calculations?

Accepted Answer

Yes, results are calculated to full precision. You can copy the exact value or use the rounded display depending on your needs.

Percentage Change Calculator

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