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All calculators

Finance

• Compound Interest Calculator Growth of a starting balance plus monthly contributions with interest on interest, year by year.
• Loan Calculator Monthly payment, total interest and an amortization schedule for personal and auto loans.
• Simple Interest Calculator Simple interest from principal, rate and time, or solve for any one of them.

Math

• Percentage Calculator Percent of a number, what percent of a total, the whole from a part and percent change.
• Fraction Calculator Add, subtract, multiply, divide and simplify fractions and mixed numbers, step by step.
• Circumference Calculator Circumference, area, radius and diameter of a circle from any one of them.

Date & Time

• Military Time Converter Standard AM/PM time to military time and back, with a 24-hour chart.
• How Many Days Until Christmas? Countdown to December 25 in days, weeks, hours and minutes, plus weekdays left.
• Days Between Dates Number of days between two dates, plus weeks, months and weekdays.
• Age Calculator Exact age from a date of birth in years, months and days, and days until the next birthday.
• Time Calculator Time between two clock times, and adding or subtracting hours and minutes.
• Decimal Hours Calculator Minutes to hours, hours:minutes to decimal hours and back, for time cards and payroll.

Health

• BMI Calculator for Adults Body mass index from feet, inches and pounds, with the adult category and a healthy weight range.
• Ovulation Calculator Likely ovulation day, fertile window and next period from your last period and cycle length.
• How Many Weeks Pregnant Am I? Weeks and days of pregnancy from your last period or due date, with the estimated due date.

Conversions

• CM to Inches and Inches to CM Centimeters and millimeters to inches and back, with TV screen sizes in cm.
• KG to LBS Converter Kilograms to pounds and pounds to kilograms with the exact factor, plus a chart.
• CM to Feet and Inches Centimeters and meters to feet and inches and back, with a height chart.
• Fahrenheit to Celsius Converter °F to °C and °C to °F with the exact formula, plus a chart for weather, fever and cooking.
• MPH to KM/H and KM/H to MPH Miles per hour to km/h and back with the exact factor, plus a speed chart.
• KM to Miles Converter Kilometers to miles and miles to kilometers with the exact factor, plus race distances.
• Gallons to Liters and Liters to Gallons US gallons to liters and back, plus UK imperial and US dry gallons, with charts.

Small Business & Payroll

• Time Card Calculator Clock-in and clock-out times for up to 7 days, minus unpaid breaks: weekly hours and pay.
• Hourly to Salary Calculator Hourly wage to yearly, monthly, biweekly and weekly pay, and a salary back to an hourly rate.
• Overtime Calculator Weekly pay with time and a half over 40 hours, plus optional double-time hours.