Percentage Change Calculator

Q: "How do I calculate percentage change?"

"Percent change = ((new − old) / old) × 100. Positive = increase, negative = decrease."

Q: "What is the formula?"

"Percent change = ((new value − old value) / old value) × 100. Old value must not be zero."

Q: "What if the old value is zero?"

"Percentage change from zero is undefined. Use a non-zero old value."

Q: "What does a negative result mean?"

"A negative percent change means a decrease (e.g. 120 to 100 → −16.67%)."

Q: "Same units for old and new?"

"Yes. Use the same units (e.g. both in dollars or both in kg). The result is a percentage (unitless)."

Calculate percent increase or decrease from old to new value. Example: 100 to 120 → 20% increase. Copy result.

Percentage change from an old value to a new value is ((new − old) / old) × 100. Positive means increase, negative means decrease. Enter old value and new value (same units). The calculator gives the percent change. Old value must not be zero. Copy the result or Copy with labels.

Loading…

Examples

100 to 120 → 20% increase
120 to 100 → 16.67% decrease
50 to 75 → 50% increase

FAQ

How do I calculate percentage change?

Percent change = ((new − old) / old) × 100. Positive = increase, negative = decrease.

What is the formula?

Percent change = ((new value − old value) / old value) × 100. Old value must not be zero.

What if the old value is zero?

Percentage change from zero is undefined. Use a non-zero old value.

What does a negative result mean?

A negative percent change means a decrease (e.g. 120 to 100 → −16.67%).

Same units for old and new?

Yes. Use the same units (e.g. both in dollars or both in kg). The result is a percentage (unitless).