Free Online Calculators for Every Need
Accurate, easy-to-use calculators for finance, health, education, and everyday calculations.
BMI Calculator
Your BMI Result
Enter your details and click "Calculate BMI" to see your result.
BMI Categories
| BMI Range | Category | Health Risk |
|---|---|---|
| Below 18.5 | Underweight | Possible nutritional deficiency and osteoporosis |
| 18.5 - 24.9 | Normal weight | Low risk (healthy range) |
| 25.0 - 29.9 | Overweight | Moderate risk of developing heart disease, high blood pressure, stroke, diabetes |
| 30.0 and Above | Obese | High risk of developing heart disease, high blood pressure, stroke, diabetes |
Mortgage Calculator
Mortgage Results
Enter your loan details to see your estimated monthly payment.
How Mortgage Payments Work
Your monthly mortgage payment typically includes four components:
- Principal: The amount you borrowed and have to pay back
- Interest: The cost of borrowing the money
- Taxes: Property taxes charged by your local government (not included in this calculator)
- Insurance: Homeowners insurance and possibly private mortgage insurance (not included in this calculator)
This calculator provides an estimate of your principal and interest payments. Your actual payment may be higher if it includes taxes and insurance.
Loan Calculator
Loan Results
Enter your loan details to see your payment breakdown.
Understanding Loan Payments
When you take out a loan, you agree to pay back the amount borrowed (principal) plus interest over a set period of time. Here's what affects your loan payments:
- Loan Amount: The more you borrow, the higher your payments will be.
- Interest Rate: A lower rate means lower payments and less total interest.
- Loan Term: A longer term means smaller monthly payments but more total interest paid.
This calculator helps you understand the trade-offs between these factors when planning a loan.
Tip Calculator
Tip Results
Enter your bill details to calculate the appropriate tip.
Tip Etiquette Guide
Tipping customs vary by country and service type. Here are general guidelines for the United States:
| Service | Suggested Tip |
|---|---|
| Restaurant servers | 15-20% of pre-tax bill |
| Bartenders | $1-2 per drink or 15-20% of tab |
| Food delivery | 10-15% of bill ($2-5 minimum) |
| Taxi/Uber/Lyft | 15-20% of fare |
| Hotel housekeeping | $2-5 per night |
GPA Calculator
GPA Results
Add your courses and grades to calculate your GPA.
Understanding GPA
GPA (Grade Point Average) is a numerical representation of your academic performance. It's calculated by:
- Converting each letter grade to its grade point equivalent (A=4.0, B=3.0, etc.)
- Multiplying each course's grade points by its credit hours
- Summing all the quality points (grade points × credits)
- Dividing the total quality points by the total credit hours attempted
This calculator uses the standard 4.0 scale. Some schools may use different scales or weighting systems for honors/AP courses.