Percentage calculator
Calculate percentages, increases, discounts and taxes in seconds.
What is a percentage of an amount?
Percentage change
Price after discount and tax
Instant results
Change any number and the calculations update automatically.
Informational estimate
Enter the tax rate manually because sales-tax rates vary by state, county and city.
How to use the percentage calculators
Use the first section to find a percentage of an amount, the second to measure an increase or decrease, and the third for discount and tax.
Practical example
A $100 product with a 20% discount becomes $80. Adding 7% sales tax produces an estimated total of $85.60.
Important limitations
Tax is applied after the discount. Enter the correct rate manually because it can vary by state, county, city and product type.
Frequently asked questions
How do I calculate 15% of an amount?
Enter 15 as the percentage and the base amount in the second field.
What does a negative percentage change mean?
It means the new value is lower than the original value.
Does the tool find my tax rate automatically?
No. You must enter the rate that applies to your purchase.
