Percentage Calculator (2026)

The simplest tool to calculate percentage of numbers, percentage increase for salary hikes, and percentage decrease for discounts or market drops.

Calculated Result

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Primary Value

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Difference

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Value A Value B

What is Percentage?

In mathematics, a percentage is a number or ratio expressed as a fraction of 100. It is often denoted using the percent sign, "%". Percentages are used to express how large or small one quantity is relative to another quantity.

In your daily financial life, percentages are everywhere. From calculating the GST on a bill to understanding the annual Inflation Rate, mastering percentages helps you make faster and better decisions.

How to Calculate Percentage

1. Percentage Of

Finding a part of a whole.

(% × Number) / 100

2. Percentage Increase

Measuring growth over time.

((New - Old) / Old) × 100

3. Percentage Decrease

Measuring a drop or discount.

((Old - New) / Old) × 100

Percentage Increase vs Percentage Decrease

While both calculate the relative change between two values, the baseline is always the original value. A common mistake in finance is assuming that a 10% decrease followed by a 10% increase brings you back to zero. In reality, a 10% drop on ₹100 brings it to ₹90. A 10% increase on ₹90 only brings it to ₹99. This is why understanding the CAGR of your investments is more accurate for long-term tracking.

Common Mistakes in Percentage Calculations

  • Wrong Base Value: Always use the original or older value as the denominator when calculating an increase or decrease.
  • Adding Percentages Incorrectly: You cannot simply add 10% and 15% discounts to get a 25% discount. Successive percentages must be calculated sequentially.
  • Confusing Percentage Point with Percent: An increase from 10% to 12% is a 2 percentage point increase, but it is a 20% relative increase.

Limitations & Guidelines

  • Context is Critical: A 100% increase sounds massive, but if the original value is ₹1, it only increased to ₹2. Always look at absolute values alongside percentages.
  • Negative Percentages: A value cannot decrease by more than 100% unless it becomes a negative number (e.g., in accounting or temperature).

Real Life Uses of Percentages

Shopping Discounts

Calculating "Buy 1 Get 1" or "Flat 30% Off" to find the effective price per unit.

Salary Increments

Comparing annual raises against the Inflation rate to see real income growth.

Investment Returns

Checking if your SIP returns are consistent with your financial goals.

Tax Calculations

Determining the tax slab percentage for Income Tax or business GST filings.

Frequently Asked Questions

What is percentage?
A percentage is a way of expressing a number as a fraction of 100. It helps in comparing different scales of numbers easily.
How do you calculate percentage?
Multiply the partial value by 100 and divide by the total value. Formula: (Part / Total) * 100.
How do you find percentage increase?
Subtract the old value from the new value, divide by the old value, and multiply by 100.
How do you calculate percentage decrease?
Subtract the new value from the old value, divide by the old value, and multiply by 100.
How to calculate 20% of a number?
Multiply the number by 0.20 or divide the number by 5. For example, 20% of 1000 is 200.
Where are percentages used in finance?
Interest rates, stock market gains/losses, tax rates, expense ratios, and inflation tracking.
Can a percentage be over 100?
Yes. If a value doubles, it is a 100% increase. if it triples, it is a 200% increase.
How are percentages used in daily life?
Calculating battery levels, loading progress, food nutrition labels, sales discounts, and exam grades.