Your rent goes from $1,200 to $1,320 — the $120 hurts, but the 10% tells you whether to be angry or relieved. Percentage increase is the change divided by the original, times 100: 120/1200 = 10%. It is the language of raises ("a 5% bump"), inflation reports, stock rallies, and tuition hikes — anywhere growth needs a common scale. A $120 increase means something wildly different on a $1,200 rent than on a $12,000 car, and the percentage is what makes those comparable.

The multiplier output is the quiet power tool here: a 10% increase means multiplying by 1.10, so next year's rent after another identical hike is $1,320 × 1.10 = $1,452. String increases together by multiplying their multipliers — two 10% raises in a row are 1.10 × 1.10 = 1.21, a 21% total, not 20%. This calculator lays it all out: enter the Original Value and the New Value, then read the Absolute Increase, the Percentage Increase, and the Multiplier. And remember the asymmetry that trips everyone up: a 25% increase followed by a 25% decrease doesn't return you to start — $100 → $125 → $93.75.

With the pre-filled defaults — Original Value 80, New Value 100 — the Percentage Increase Calculator returns Absolute Increase 20.0000, Percentage Increase (%) 25.0000, Multiplier 1.250000. Change any input and those results update instantly, so you can see exactly how each number you enter moves the answer.