Fast, free calculators for school, health, pay, dates and everyday math. Your numbers stay in your browser.

• Grade Calculator
• GPA Calculator
• Age Calculator
• Days Between Dates Calculator
• Dice Roller
• Calorie Calculator
• Salary to Hourly Calculator
• Hourly to Salary Calculator
• GST Calculator (India)
• Gratuity Calculator (India)

Guides

How Many Calories Do You Need Per Day? (Simple Method)

How many calories do you need? Estimate daily calories with the Mifflin-St Jeor equation and a worked example.

How to Calculate GST: Add and Remove GST With Examples

Learn how to calculate GST: add GST to a price, remove it from a total and split CGST and SGST, with examples.

Gratuity Calculation in India: Formula and Example

Gratuity calculation explained: the formula (salary x 15/26 x years), rounding of years, eligibility and the Rs 20 lakh limit.

Salary to Hourly: How to Convert Annual Pay and Back

Salary to hourly made simple: convert annual pay to an hourly rate and back with the 2,080-hour method, plus examples.

How to Find Your Final Exam Grade: The Score You Need

Find your final exam grade target with one simple formula: the score you need for your class goal, with examples.

How to Calculate GPA on a 4.0 Scale (With Examples)

Learn how to calculate GPA step by step, see a worked example, and how weighted GPA differs from unweighted.