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 Financial Calculators

 Loan Calculator This calculator takes any two of the three variables (Loan, Interest Rate, and Number of months) and gives the answer for the remaining one. The advanced version allows for different compounding and payment frequencies. Also, Canadian users will find this Canadian Mortgage Calculator rather handy as the interests default to compound semi-annually. Lease Calculator Leasing a car? Confused about the money factor that car dealers always mention? We have a mathematical proof that relates money factor to the actual interest rate. The advanced version allows for different compounding and payment frequencies. APR Calculator So what is the difference between APR and the Interest Rate? This calculator gives a full definition of APR and helps you determine it for a given interest rate and points cost. The advanced version allows for different compounding and payment frequencies. Currency Calculator Updated daily, this calculator gives the exchange rates of more than 60 currencies and converts from one to another.
 Engineering Design Aids

 Unit Conversion Calculator Featuring more than 800 units in our database (and growing), we give the unit definition and SI-dimensions in addition to converting from one unit to other units in the same family. Fraction Calculator Design engineers, ever wonder what the closest 32nd number is for a decimal fraction? This calculator tells you where your decimal fraction stands on the 1/8, 1/16, 1/32, and 1/64 scales. Gage Calculator There are so many systems for gaging wires and sheets. This calculator allows you to convert back and forth between gages and the actual decimal numbers in different standards. O-Ring Calculator This calculator outputs the O-Ring inner diameter and the range of O-Ring cross-section diameters that will meet user prescribed limits on groove and bore diameters and O-Ring compression. Spring Calculators Frustrated by reading spring catalogs trying to figure out which spring gives you the right force or displacement? Maybe one of these 8 calculators can help you. More calculators will be added soon! Hardness Approx. Converter This calculator explains and inter-converts comomonly used hardness scales, including Brinell, Knoop, Mohs, Rockwell, Shore, and Vickers.
 Mechanical Formulas