Free calculators
Seven tools, one page. Pick one below.
Tip calculator
Enter the bill, pick a tip percent, split it across the table.
15% is standard, 18-20% for good service, 10% for counter service or takeout.
Percentage calculator
Three common percentage problems, solved instantly.
Age calculator
Enter a birth date. Get exact age down to the day, and a countdown to the next birthday.
GPA calculator
Add each course's grade and credit hours. GPA updates on a standard 4.0 scale.
Loan and mortgage calculator
Enter loan amount, annual interest rate, and term.
Estimate covers principal and interest only. It does not include property tax, insurance, or PMI.
BMI calculator
Enter height and weight in US units.
Under 18.5 underweight, 18.5-24.9 normal, 25-29.9 overweight, 30+ obese. BMI does not account for muscle mass, frame, or age.
Hourly to salary calculator
Convert an hourly rate to a full pay breakdown, or go the other way from an annual salary.
Gross pay before taxes. Take-home pay depends on your state, filing status, and withholdings.