Percentage Increase Decrease Calculator

A percentage change calculator helps you find how much a value has increased or decreased in percentage terms. Whether you are tracking a salary hike, product price change, stock movement, or exam score improvement, this tool gives you instant answers.

Use Apply % Change mode to see the new value after a rise or fall. Use Find % Change to know the exact % difference between two numbers. Use Find Original to reverse-calculate what the value was before the change.

1. Percentage Increase: New Value = Original × (1 + %/100)
2. Percentage Decrease: New Value = Original × (1 − %/100)
3. % Change: % Change = ((New − Old) ÷ |Old|) × 100
4. Find Original: Original = New ÷ (1 ± %/100)

Example: ₹500 with 20% increase → ₹500 × 1.20 = ₹600.

A percentage increase measures growth: e.g. a product whose price rose from ₹200 to ₹250 increased by 25%. A percentage decrease measures reduction: a stock that fell from ₹1,000 to ₹800 fell by 20%.

Note: a 25% increase followed by a 25% decrease does NOT bring you back to the original — you end up at 93.75% of the start. This calculator lets you explore such effects instantly.

• Salary & HR: Appraisal hike calculation, CTC comparison
• Finance: Share price movement, NAV change, interest rate changes
• Retail: Price revision, discount effect, margin change
• Academics: Score improvement from test to test
• Health: Weight loss or gain tracking in percentage terms