How is % increase different from % decrease?

A percentage increase means the new value is larger than the original; a percentage decrease means it is smaller. The formula is the same — the sign of the result tells you the direction.

Can I find the original value if I know the % change?

Yes — use Find Original mode. Original = New ÷ (1 ± %/100). For a 20% increase: Original = New ÷ 1.20.

Is a 50% increase followed by a 50% decrease the same as no change?

No. A 50% increase on ₹100 gives ₹150, then a 50% decrease gives ₹75 — a net loss of 25%. Percentage changes are multiplicative, not additive.

How do I calculate percentage change in Excel?

Use: =(B1-A1)/ABS(A1)*100 where A1 is the original and B1 is the new value. Multiply by 100 to get the percentage.

What is a 100% increase?

A 100% increase means the value has doubled. E.g. ₹500 with a 100% increase = ₹1,000.

Percentage Increase Decrease Calculator

★★★★★4.8|👁10,000+ uses|📅Updated Apr 2026

✍Reviewed by Prof. Suresh Kumar, M.Sc.

What is a Percentage Change 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.

Mode

Enter Details

Original Value

% Change

∑Formula

Increase: New = Original × (1 + %/100)

Decrease: New = Original × (1 − %/100)

% Change: ((New − Old) ÷ |Old|) × 100

Example Calculations

2 examples

Inputs

Original Value500

% Change20%

Results

After Increase600.00

After Decrease400.00

Change Amount100.00

Step-by-Step

A 20% increase on ₹500 gives ₹600. A 20% decrease gives ₹400. The change amount is ₹100.

Click any example to expand and see step-by-step workings. Use "▶ Load this example" to auto-fill the calculator.

How to Calculate Percentage Increase or Decrease

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

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

Percentage Increase vs Percentage Decrease — Key Differences

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.

When to Use Percentage Change Calculations

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

Why Use CalcPioneer Percentage Change Calculator?

🆓

Free and works on all devices

✨

Three modes in one tool

increase, decrease, find original

⚡

Real

time results as you type

∑

Step

by-step formula breakdown shown

🎯

Accurate to 4 decimal places

Frequently Asked Questions

Percentage Increase = ((New − Old) / |Old|) × 100. If the result is positive it is an increase; negative means decrease.

More About This Calculator

In-depth guides and tips for getting the most out of this tool.

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