Time Card Calculator
Free time card calculator to add up work hours with lunch breaks and overtime. Enter clock-in and clock-out times for weekly totals in decimal and hours:minutes, plus pay.
Money & Finance
Understand the arithmetic behind pay, taxes, borrowing, interest, and savings. Start with the salary calculator, compound interest calculator, or mortgage calculator. Check the selected jurisdiction, tax year, fees, and exclusions before using any estimate for a decision.
Is Salary Calculated for 30 Days or Working Days?
Learn when monthly salary is divided by 30 calendar days, 26 days, or actual working days, with practical partial-month examples.
APR vs APY: The Difference With Real Dollar Examples
APR and APY are both annual percentages, but they answer different money questions. Learn how fees and compounding change the comparison.
Rule of 72: Estimate How Long Money Takes to Double
The Rule of 72 is a quick mental estimate for doubling time—not a promise of returns. Use the formula, chart, and limitations correctly.
Overtime Pay Calculator by State (2026 Rules)
If you work more than 40 hours in a week, federal law says you’re owed extra pay — but how
Money & Finance
Tipping Guide USA: How Much to Tip in the US (2026)
Tipping in the United States confuses locals and visitors alike. The percentages shift depending on where you are, screens now
Money & Finance
What Is a Good Tip at a Restaurant? (US Guide)
Tipping in the US is practically an art form. One day you’re at a casual diner, the next you’re at
Money & Finance
How Much to Tip a Tour Guide (Group vs Private)
You’ve spent the afternoon learning the secret history of a city or hiking a hidden trail, and your guide has
Money & Finance
How Much to Tip an Uber or Rideshare Driver
You’ve reached your destination, the door opens, and you’re about to hop out. Then you remember the tip. Ride-share tipping
Money & Finance
How Much to Tip Hotel Housekeeping (Per Night Guide)
You’re checking out of your hotel, looking at the nightstand, and wondering if you should leave a few dollars for