Percentage Calculator
What is 15% of 80? X is what % of Y? Percentage change between two numbers.
Tip Calculator
Calculate tip amount and split the total bill among any number of people.
Discount Calculator
Find the sale price after a percentage discount, or find the original price.
Sales Tax Calculator
Add or remove sales tax from any price. Works with any tax rate.
Salary Calculator
Convert annual salary to hourly, monthly, weekly, or daily pay rate instantly.
Profit Margin Calculator
Calculate gross profit margin, markup percentage, and ideal selling price.
Budget Calculator
Apply the 50/30/20 budgeting rule to your monthly take-home income.
Financial Guides
View all →How to Calculate a Tip
Formulas, etiquette, and mental math tricks for any situation.
Understanding Sales Tax
Why rates vary, what's exempt, and how online shopping is taxed.
The 50/30/20 Budget Rule
Needs vs. wants explained, with tips for when the numbers don't fit.
Salary to Hourly Guide
The formula, benchmarks, and how to compare job offers fairly.
Answers to Everyday Money Questions
Calcu gives you fast, accurate answers to the financial questions you face every day — whether you're splitting a dinner bill, figuring out a sale price, checking how much a raise is really worth, or building a monthly budget. Every tool works instantly in your browser with no account required and no data collected. Bookmark the calculator you use most, or browse the full collection.