| Financial Calculators |
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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. |
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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 |
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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. |
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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. |
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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 |
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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. |
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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. |
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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. |
Radiation 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!) |
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Laminar Flow Over Plate Heat convection by forced laminar flow over an isothermal plate. |
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. |
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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. |
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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. |
Plate Calculators Featuring 11 calculators that output the maximum displacement and stress for common plates with different boundary conditions under various loadings. |
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Stress Concentration 11 calculators are provided to calculate the stress concentration factor K for common features such as notches, holes, grooves, and shoulders. |
Column Buckling Critical Load Calculator computes the critical load, the boundary condition factor, and the effective length of a column; Structural Steel Column Calculator is designed specifically for structural steel columns to compute the allowable stress with respect to a given safety factor. |
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Composite Materials 3 calculators are provided to help determine the mechanical properties of the composite lamination with multiple layers. First, the equivalent material constants of a single layer along the principal directions are estimated. Then, the stiffness and compliance matrices of such a layer are constructed. Finally, the laminae are 'glued' together and the stiffness matrices A, B, and D of the laminate are built. |
Saturated Steam Table Temperature and pressure of saturated steam are closely related. When one of them is given, the other is determined. This calculator calculates the density, specific volume, internal energy, enthalpy, and entropy of saturated steam based on tabulated data using interpolation. |
| Mathematics |
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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! |
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Gaussian Quadratures Gauss-Legendre Gauss-Hermite Gauss-Laguerre These calculators output the abscissas and weights used in Gaussian quadrature (a numerical integration technique). |
Arithmetic (Mathematica Powered) Evaluation Polynomial Expansion Partial Fraction Sum Product Root Finding Multiple Equations |
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Calculus (Mathematica Powered) Derivative Definite Integral Indefinite Integral Limit |
Series (Mathematica Powered) Series Expansion Sum Product |
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Functions (Mathematica Powered) Evaluation Exponential to Trigonometric Trigonometric to Exponential Expand Trigonometric Reduce Trigonometric Expand Special Functions Expand Complex Functions |
Matrix / Linear Algebra (Mathematica Powered) Series Expansion Sum Product |
