EDA, Incorporated

Cool Calculators

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Financial Calculators

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Pure Mathematics


More Information on the above calculators is provided in the table below:

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.
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.
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.
Currency Calculator
Updated daily, this calculator gives the extrange 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

Beam Calculators
Featuring 11 calculators that output the displacement, rotation, force, moment, and shear for beams with different boundary conditions under various loadings.
SDOF Vibration
This calculator returns the natural frquencies, damping ratio, and the closed-form solution for a Single-Degree-Of-Freedom mass-spring-damper system.
Reynolds Number
This calculator quickly gives you the Reynolds Number for a flow over a plate or a flow in a pipe.
Venturi Flowmeter
This calculator outputs the flowrate through a venturi constriction for a given pressure drop.
Pipe Friction
Frustrated by using the Moody Chart to calculate pressure loss in pipes? This calculator does it for you and tells you the Reynolds number, pressure drop, and flow rate for a constant cross-section pipe.
Ever wonder how much heat per second is radiated from your (bald) head to the dark night sky if you are standing in an open field? You can use this calculator to figure that out! (Hint: It's about 10 watts if you are really bald!)
Stress Transforms
Remember Mohr's Circle? We provide calculators that execute the math behind Mohr's Circle for the cases of Plane Stress and Plane Strain.
Principal Stress
Need to find the principal stresses and their directions for a given input stress state? These calculators do the math for you for the case of Plane Stress and Plane Strain.
Elastic Constants
OK, we all remember that an isotropic material requires only 2 elastic constants to describe its material behavior. But which 2 constants to use?
Youngs modulus, Poisson ratio, shear modulus, or bulk modulus? Don't sweat it anymore - this calculator allows you to convert from any 2 constants to all others in common use.
Failure Criteria
Remember how to apply von Mises and the Maximum Shear criteria to evaluate failure risk? How about Maximum Stress or Mohr's Theory? We encourage you to freshen up on the basics, but short of that here are 2 calculators for applying failure criteria to brittle and ductile materials.
Pure Mathematics

Base-N Conversions
Converts integers expressed in one base to all other bases, up to base 36.
Gamma Function
This calculator evaluates the Gamma Function for a given argument. We don't know how useful this is, but then again, it is cool!
Gaussian Quadratures
 Gauss-Legendre     Gauss-Hermite
These calculators output the abscissas and weights used in Gaussian quadrature (a numerical integration technique).

The above links have been reviewed and approved to be the best engineering information available on the internet, so please enjoy and if you have a better link of engineering information, email it to SiteManager@edasolutions.com .

Company Profile

EDA, Incorporated provides quality-engineering services on time, on schedule and within budget.  EDA, Inc. is able to do this by performing the work correctly the first time. We accept the most challenging problems and look forward to working with the client as a team member.  EDA believes that the client should be an active participant in the work process to ensure that the product is commensurate with client expectations and is delivered within schedule and budget constraints.

EDA, Inc. belongs to the American Society of Mechanical Engineers (ASME), the National Society of Professional Engineers (NSPE), the Society of Instrument Control Engineers, Society of Professional Engineers (ISA) and the American Nuclear Society (ANS).

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For more information on EDA, Incorporated services, please contact Client Service Manager at:

Client Service Manager

EDA, Inc.

6397 True Lane

Springfield, VA 22150


or email  the Client Service Manager at SiteManager@edasolutions.com .

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Contact Information

Virginia Office (703) 313-9138
Postal address
6397 True Lane
          Springfield, Va 22150
Electronic mail
General Information:  Site Manager@edasolutions.com