How do I calculate a price after adding 8% sales tax?

Enter the pre-tax price as Base and 8 as Percentage. The result is the total amount including tax.

Can I add more than 100% using this tool?

Yes. For example, adding 150% to a base of 200 gives 200 x (1 + 1.5) = 500.

What if I want to add two different percentages, like tax and a service charge?

Combine them into one percentage first if they both apply to the original base (e.g. 8% + 3% = 11%), then enter the combined rate.

Add Percentage to a Number Calculator

Add a percentage to any number to find the increased total. Enter the base number and the percentage to add. Useful for calculating totals with tax, gratuity, markup, or any percentage surcharge.

By AbraCalc Editorial Team · Reviewed by AbraCalc Methodology Review · Last reviewed: 2026-06-25

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How to use this tool

Enter base number and percentage to add in the fields above.
Results update instantly as you type — or click Calculate.
Read your result (base + percentage) and the full breakdown beneath it.

Formula

Total = Base x (1 + Percentage/100)

How it works

Multiply the base by the percentage divided by 100 to get the added amount, then add it to the base.

Worked example

Add 20% to 200

20% of 200: 0.20 x 200 = 40
Total: 200 + 40 = 240

Common mistakes to avoid

Adding the raw percentage to the base instead of computing (Percentage/100) x Base first, e.g. adding 20 instead of 20% of the base.
Using this tool when you want to find what percentage was added after the fact; that requires the reverse percentage calculator.
Entering a markup percentage that already includes the base (e.g. 120% to mean 20% markup) instead of entering 20 as the add percentage.

Key terms

Frequently asked questions

How do I calculate a price after adding 8% sales tax?: Enter the pre-tax price as Base and 8 as Percentage. The result is the total amount including tax.
Can I add more than 100% using this tool?: Yes. For example, adding 150% to a base of 200 gives 200 x (1 + 1.5) = 500.
What if I want to add two different percentages, like tax and a service charge?: Combine them into one percentage first if they both apply to the original base (e.g. 8% + 3% = 11%), then enter the combined rate.