Tool 5 of 10
Percentage increase / decrease calculator.
Apply a percentage increase or decrease to any starting value.
New value
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Amount added
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Frequently asked questions.
How do I calculate a percentage increase?
New Value = Original × (1 + Percentage / 100). For example, a 20% increase on 150 = 150 × 1.20 = 180.
How do I calculate a percentage decrease?
New Value = Original × (1 − Percentage / 100). For example, a 15% decrease on 200 = 200 × 0.85 = 170.
What is the amount of increase or decrease?
Amount = Original × (Percentage / 100). The new value equals Original ± Amount depending on increase or decrease.
Can I apply more than 100% increase?
Yes. A 200% increase means the value triples: Original × (1 + 200/100) = Original × 3.
Can percentage decrease exceed 100%?
No. A 100% decrease brings the value to zero. Anything beyond that would produce a negative result, which has different mathematical meaning.
How is this different from the percentage change calculator?
The percentage change calculator tells you what percentage something changed by (given old and new values). This tool applies a known percentage increase or decrease to a value.