Every financial decision involves percentages. Using a percentage calculator money tool allows you to make informed purchases, budget accurately, and prevent overpaying.
Everyday Money Math Fundamentals
To find any percentage of an amount of money, convert the percentage into hundredths (divide by 100) and multiply by the monetary sum.
Calculate Dollar Percentages Instantly
Test sales tax, discounts, or loan percentages on our free online tool.
Calculating Restaurant Gratuities
Common gratuity rates and mental calculation shortcuts:
- 15% Tip: Find 10% (move decimal left once) and add half of that amount. On $80: $8 + $4 = $12.
- 18% Tip: Multiply bill by 0.18 ($80 × 0.18 = $14.40).
- 20% Tip: Find 10% and double it ($8 × 2 = $16.00).
Retail Sale & Clearance Discounts
When an item is 25% off, you pay 75% of the sticker price. Multiply by 0.75 directly for instant checkout verification.
Sales Tax, GST and VAT Calculations with Money
When dealing with consumer goods, invoices, and services, percentage calculations dictate the final checkout price:
- Adding Sales Tax: Multiply the pre-tax price by
(1 + Tax Rate / 100). For instance, an $85 order with 8.25% sales tax costs$85 × 1.0825 = $92.01. - Extracting Tax from a Gross Total: To find how much tax was included in a $120 total at 20% VAT, divide by 1.20:
$120 ÷ 1.20 = $100base price, meaning $20 was tax. - Tipping on Subtotal vs. Total: Financial best practice suggests calculating discretionary gratuity (e.g., 18% or 20%) on the pre-tax food subtotal rather than on the post-tax bill.
Run your financial scenarios through our free percentage calculator.