How to Add Percentages to a Price

Adding a percentage to a price is a common calculation used for markups, tax, commissions, and price increases. By understanding the basic formula, you can quickly determine the new price after a percentage has been added. Learning how to add percentages to a price helps you make accurate calculations for personal and business purposes.

1. Table of Contents

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   Determine the Original Price

Start by identifying the original price of the item or service.

This is the amount to which the percentage will be added.

• Find the current price
• Confirm the amount is correct
• Use it as the starting value

2. Convert the Percentage to a Decimal

To perform the calculation, convert the percentage into decimal form.

Divide the percentage by 100.

• 10% becomes 0.10
• 15% becomes 0.15
• 25% becomes 0.25

3. Calculate the Percentage Amount

Multiply the original price by the decimal value.

This gives you the amount that will be added.

• Multiply the price by the percentage decimal
• Note the result
• This is the increase amount

4. Add the Percentage Amount to the Original Price

Take the increase amount and add it to the original price.

The result is the new price after the percentage increase.

• Add the two amounts together
• Check your calculation
• Record the final price

5. Use a Quick Formula

You can also calculate the new price in one step using:

New Price = Original Price × (1 + Percentage as a Decimal)

For example, if an item costs 100 and you want to add 20%:

• 100 × (1 + 0.20)
• 100 × 1.20
• New Price = 120

6. Verify the Final Amount

Review your calculation to ensure the percentage was applied correctly.

This helps prevent pricing errors.

• Recheck the percentage used
• Confirm the final amount
• Round decimals if necessary

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