Calculators

Calculating Numbers & More

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Math Calculators
Math.com: Mathematical Calculators Online
Basic, Scientific, Square Root, Circle, Prime Numbers, Quadratic Equations, Percentages, Trigonometry, Probability, Finance
Metacalc
Simple basic math operations (add, subtract, multiply, divide, square roots, etc.). Large print mode available (click the magnifying glass icon on the top right side of their page).
Scientific Calculator Online
From EEweb Electrical Engineering Community.


Other Calculators
Bankrate.com Calculators
Specialized calculators for various topics including: mortgages, automotive/cars (loans, leasing, payments, down payments), credit cards, investments, home equity, retirement, savings, college financing.
CPI Inflation Calculator
"The CPI inflation calculator uses the average Consumer Price Index for a given calendar year. This data represents changes in prices of all goods and services purchased for consumption by urban households. This index value has been calculated every year since 1913. For the current year, the latest monthly index value is used." From U.S. Bureau of Labor Statistics (BLS).
Credit Card Repayment Calculator
"Based on the information you provide, the calculator will give you an estimate of how long it will take you to pay off your credit card balance." From the U.S. Federal Reserve.
Food-o-Meter: Food Calorie Calculator
"Find nutrition facts including calories, fat, carbohydrates, protein, sugar, fiber in over 37,000 foods and beverages." From WebMD.com.
Health Calculators
From HealthFinder.gov.
Home Energy Saver (HES)
"HES computes a home's energy use on-line in a matter of seconds based on models and data developed at the U.S. Department of Energy's Lawrence Berkeley National Laboratory. All end uses (heating, cooling, water heating, major appliances, small appliances, and lighting) are included. HES generates a list of energy-saving upgrade recommendations for the user's consideration. HES is not a 'black box' - we extensively document all methodologies and assumptions." From the U.S. Department of Energy.
Household Emissions Calculator
Use this to get a "ballpark estimate of your personal or family's greenhouse gas emissions and explore the impact of taking various actions to reduce your emissions." From the U.S. Environmental Protection Agency (EPA).
Library Value Calculator
From the American Library Association (ALA).
Life Expectancy Calculators
Includes Medical Calculators, Statistical Calculators, Fun Calculators, UCSF Geriatric Prognosis, and Life Expectancy Tables. Includes words of caution about using these calculators.
Living Wage Calculator
"Estimate the cost of living in your community or region. The calculator lists typical expenses, the living wage and typical wages for the selected location." From Pennsylvania State University.
NOAA Solar Calculator
"Find sunrise, sunset, solar noon and solar position for any place on earth."
Online Calculators
Math and Electrical Calculators.
Postage Price Calculator
Domestic and International Retail Prices. From the United States Postal Service.
Time Capsule
Enter a date between 1800 and 2002. Creates a page with the headline, top songs, prices, TV shows, toys, books and movies in that week.
Weather Calculators
Topics include: Fahrenheit to Celsius, Wind Speed, Relative Humidity, Wind Chill, Heat Index. From The Washington Post.
What's My Carbon Footprint?
From the Nature Conservancy.
Wolfram|Alpha
Performs "dynamic computations based on a vast collection of built-in data, algorithms, and methods."


See also these related topics (many of which include links to additional specialized calculators):


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