AJ Design Software provides programs, freeware applications, tools, solutions and online calculators for engineering, design, science and education problems.

Miscellaneous
Ohm's Law Calculator	Solves for any variable in the Ohm's Law equation. Includes computations for electrical resistance (ohms), power (watts), current (amps) and voltage (volt).
Oil Recovery Factor Calculator	Solves related to oil recovery factor, recoverable oil estimate, in place oil estimate, gasoline, petrol and petroleum.
Operating Expense Ratio Calculator	Solves financial problems related to operating expense ratio, operating expense and gross operating income.
Orifice Flow Design Calculator	Solves problems related to orifices, flow rate, discharge coefficient, orifice area, gravitational constant and center line head.
Overtime Pay Rate Calculator	Calculate overtime hourly pay rates given normal or standard pay rate. Calculates time and a half, double, triple and quadruple overtime pay rates. Page is related to work and career.
Parshall Flume Design Calculator	Solves problems related to Parshall flumes, flow rate, upstream depth and throat section width.
Peclet Number Calculator	Solves problems related to Peclet dimensionless value, velocity, density, heat capacity, heat transfer conduction and convection, characteristic length and thermal conductivity.
Pendulum Formulas Calculator	Solves problems related to simple and physical pendulums, period, time, center of mass, moment of inertia, distance, pivot, acceleration of gravity and length.
Permeameter Calculator	Solve problems related to permeameters, permeability coefficient, porous material flow rate, cross sectional area, pressure head change and length change.
Pipe Hydrostatic Pressure Load Calculator	Solves problems related to hydrostatic pressure loads, external hydrostatic pressure, water unit weight and height of water above pipe top.
Pipe Soil Pressure Load Calculator	Solves problems related to soil pressure loads, soil weight pressure, soil unit weight, height of water above pipe top, water buoyancy factor, soil load per linear length of pipe, soil prism load theory, groundwater, outside pipe diameter and height from pipe top to ground surface.
Pipe Vacuum Pressure Load Calculator	Solves problems related to vacuum pressure loads, load per linear length of pipe, internal vacuum pressure, valve closures, shutoff pump, siphon and inside pipe diameter.
Pipe Wheel Loading Calculator	Solves problems related to wheel or track load per linear length of pipe, underground pipes, vehicular loads, surface wheel load, impact factor, ground surface height above pipe top, outside diameter, pressure distribution, metal pipe, pipe wall thickness, pressure on pipe and fill depth.
Plastic Pipe Design Calculator	Solves problems related to plastic pipes, AWWA C900 pipe, surge pressure, instantaneous velocity change, pressure rating and class, hydrostatic design stress, outside and inside diameter dimension ratio, short term pressure rating and strength, hoop strength, quick burst pressure and safety factor.
Potential Energy Calculator	Solves problems related to potential energy, mass, acceleration of gravity and height.
Prandtl Design Calculator	Solves problems related to Prandtl dimensionless value, heat transfer, fluid mechanics, diffusion of heat and momentum, kinematic viscosity and thermal diffusivity.
Present Worth Analysis Calculator	Solves problems related to present worth or value, future worth or value, interest rate, number of years and annual payment or cost.
Profitability Index Calculator	Solves financial problems related to profitability index, present value of future cash flows, initial cash investment, profit investment ratio and value investment ratio, land, building and residential, industrial and commercial investment property.
Relative Humidity Calculator	Solves problems related to relative humidity, actual vapor pressure, dew point temperature and saturated vapor pressure.
Return on Equity Calculator	Solves problems related to return on equity, cash flow after taxes, initial cash investment, resale value and mortgage balance.
Reynolds Number Calculator	Solves problems related to Reynolds Number, turbulent, laminar and transitional flow, density, pipe diameter, characteristic length, absolute dynamic viscosity and flow velocity.
Risk Equations Calculator	Solves problems related to relative risk, standard mortality ratio, carcinogen exposure, cancer probability, individuals, carcinogenic risk, chronic daily intake, carcinogen slope factor, hazard index, reference dose, contact rate, duration, averaging time, retention rate, bloodstream absorption, administered, intake dose, fugitive dust and population.
Rule Of 72 Calculator	Solves problems related to the Rule of 72, annual interest rate, years to double money and investments.
Schmidt Number Calculator	Solve problems related to Schmidt number dimensionless values, fluid mechanics, mass transfer, kinematic viscosity and mass diffusivity.
Seismic Geophone Calculator	Solve problems related to upper or overburden layer depth, lower or bedrock velocity and intersection point distance.
Sherwood Number Calculator	Solve problems related to Sherwood number, mass transfer coefficient, characteristic length and diffusion coefficient.
Snow Calculator	Solves problems related to melt depth, melt density, snowpack density, heat capacity and content, latent heat of fusion, liquid water density, cold snowpack water depth equivalent, specific heat, temperature, heat storage change, short wave solar radiation, long wage radiation exchange, air convection, condensation or sublimation, ground conduction, precipitation advection and snow pack depth.
Smooth Wall Steel Pipe Calculator	Solve problems related to smooth wall steel pipes, pressure rating, allowable stress, yield strength, wall thickness and outside pipe diameter.
Solid Waste Calculator	Solve problems related to solid waste moisture content, dry sample weight, landfill top soil layer percolation, precipitation, runoff coefficient, storage, evapotranspiration and wet weight.
Soil Resistivity Calculator	Solve problems involving soil resistivity, electrode spacing, voltage at inner electrodes and applied current at the outer electrodes.
Specific Gas Constant Calculator	Solve problems involving specific gas constant, universal gas constant and molecular weight.
Specific Volume Calculator	Solve problems involving specific volume and density.
Square Calculator	Geometry calculator solving for square properties and characteristics. Properties include side and diagonal length, area and perimeter.
Statistics Calculator	Solves problems related to standard deviation, variance, mean, binomial coefficient, median, samples, standard error parameter, sample size, mean value sample estimate, probability theory, data analysis, variability coefficient and populations.
Suspension Coil Spring Rate Calculator	Solves problems related to coil springs, spring rate constant, torsional or rigidity modulus, wire diameter, number of active coils and mean coil diameter.
Swimming Pool Water Maintenance Calculator	Solves problems related to swimming and wading pool water balance, hot tubs, saturation index, temperature, calcium hardness, alkalinity, corrosive, turnover rate, pump flow rate, pool volume and scale forming conditions. It determines if the water is balanced, over saturated or under saturated.
Temperature Conversion Calculator	Solves problems related to thermometers , Fahrenheit, Celsius and Kelvin.
Thermal Conductivity Calculator	Solves problems related to heat transfer rate, heat transport, flux, thermal conductivity constant, temperature differential, distance and length.
Thermal Diffusivity Calculator	Solves problems related to thermal diffusivity, thermal conductivity, volumetric and specific heat capacity and density.
Note:	This online software site provides a resource for solving math, algebra, chemistry, geometry, trigonometry, physics and science problems. Covers problems and solutions at the grade school, middle school, high school, university and college course levels. Students, teachers, instructors, professors, educators, and tutors feel free to use charts, images, diagrams, formulas, answers, pictures, graphs, plots, code, figures and equations in your school lesson plans, assignments, tutorials, help or review sessions, examples, class room presentations, lectures, research trials, lab experiments, instruction manuals, jobs, careers, work, papers, helper worksheets, tests, exams, quizzes, projects, essays, how to guides and homework.
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