Engineering Directory

Size an air compressor from CFM requirements, duty cycle, and tool demand.

Calculate tons of asphalt needed from area, thickness, and mix density.

Estimate battery runtime from capacity (mAh/Wh) and device power consumption.

Calculate bearing L10 life using dynamic load rating, equivalent load, and speed.

Calculate belt drive speed with inputs, formulas, and instant results.

Calculate V-belt and timing belt length from pulley diameters and center distance.

Determine cable ampacity (current-carrying capacity) based on NEC tables and derating factors.

Calculate cable tray width from cable count, diameters, and NEC fill requirements.

Calculate cam profiles for follower displacement, velocity, and acceleration.

Calculate cantilever retaining wall with inputs, formulas, and instant results.

Size capacitor banks for power factor correction from measured kW, kVA, and target PF.

Size storm water catch basins from drainage area, runoff coefficient, and rainfall intensity.

Calculate California Bearing Ratio for subgrade strength assessment in road design.

Calculate centrifugal force from mass, radius, and rotational speed.

Calculate CNC milling feed rate from RPM, number of flutes, and chip load.

Calculate air compressor capacity from tool CFM requirements, duty cycle, and altitude.

Calculate conveyor belt speed, capacity, and motor power from load and dimensions.

Calculate cooling tower range, approach, and effectiveness from water and air conditions.

Calculate culvert pipe diameter from peak flow rate and allowable headwater depth.

Calculate horizontal curve radius, length, and deflection angle for road design.

Calculate cutting speed in SFM or m/min from workpiece diameter and spindle RPM.

Calculate friction head loss in pipes using the Darcy-Weisbach equation.

Estimate the number of theoretical stages using McCabe-Thiele method for binary distillation.

Calculate optimal drill RPM from material cutting speed and drill bit diameter.

Calculate cut and fill volumes for earthwork projects using the average end area method.

Calculate conduit fill percentage based on NEC code for wire types and conduit size.

Calculate total electrical panel load from all branch circuits for service sizing.

Calculate emergency lighting unit count from floor area and lux requirements.

Calculate electrical energy cost from power consumption, usage hours, and utility rate.

Calculate factor of safety with inputs, formulas, and instant results.

Calculate required fan airflow in CFM for room ventilation by volume and air changes.

Estimate fatigue life using S-N curve data and Miner rule for cumulative damage.

Estimate flash point of liquid mixtures from component flash points and mole fractions.

Calculate volumetric and mass flow rate from pipe diameter, velocity, and fluid density.

Calculate rotational kinetic energy stored in a flywheel from mass and angular velocity.

Calculate the correct fuse or circuit breaker size from load current and wire gauge.

Calculate gabion basket quantity and rock fill volume for gabion retaining walls.

Calculate gear module, pitch diameter, and center distance from tooth count and module.

Calculate gear ratio with inputs, formulas, and instant results.

Calculate geogrid reinforcement layers and spacing for reinforced soil walls and slopes.

Calculate earth grounding resistance from rod dimensions and soil resistivity.

Calculate pipe flow velocity and head loss using the Hazen-Williams equation.

Calculate heat duty, LMTD, and required area for shell-and-tube heat exchangers.

Calculate heat loss with inputs, formulas, and instant results.

Calculate hydraulic cylinder force from bore diameter and system pressure.

Calculate energy stored in an inductor from inductance and current.

Calculate the inverter size needed for off-grid or backup power from total load wattage.

Determine standard keyway dimensions from shaft diameter using ANSI/DIN tables.

Calculate the number and spacing of light fixtures needed for target lux levels.

Convert between lux (illuminance) and lumens (luminous flux) based on area.

Calculate open channel flow velocity and discharge using Manning roughness equation.

Perform mass balance calculations for steady-state processes with multiple streams.

Calculate electric motor horsepower from voltage, current, efficiency, and power factor.

Calculate inrush current at motor startup from nameplate FLA and code letter.

Select the correct O-ring size from groove dimensions, ID, and cross-section.

Interactive Ohm law wheel calculator showing relationships between voltage, current, resistance, and power.

Calculate open channel manning with inputs, formulas, and instant results.

Calculate flow rate through an orifice plate from differential pressure and orifice diameter.

Calculate parking lot dimensions and stall count from total vehicles and layout type.

Calculate minimum PCB trace width for a given current using IPC-2221 standards.

Calculate the volume of acid or base needed to neutralize a solution to target pH.

Calculate pipe flow darcy weisbach with inputs, formulas, and instant results.

Calculate pressure drop in piping systems from flow rate, pipe size, and fittings.

Calculate pneumatic cylinder force and air consumption at operating pressure.

Calculate the capacitor bank size needed to improve power factor to a target value.

Calculate interference fit pressures and stresses for shaft-hub assemblies.

Calculate wall thickness for cylindrical and spherical pressure vessels using ASME code.

Calculate prestress losses and tendon force for prestressed concrete beam design.

Calculate psychrometric with inputs, formulas, and instant results.

Calculate mechanical advantage and force in single and compound pulley systems.

Calculate total dynamic head for pump selection from static head, friction, and velocity.

Calculate RC circuit time constant and charging/discharging curves.

Calculate chemical reaction rate from concentration, temperature, and activation energy.

Check overturning, sliding, and bearing capacity stability for gravity retaining walls.

Calculate resonant frequency, impedance, and Q factor for series and parallel RLC circuits.

Calculate rlccircuit impedance with inputs, formulas, and instant results.

Calculate road grade percentage and slope from elevation change and horizontal distance.

Calculate road superelevation with inputs, formulas, and instant results.

Calculate major, minor, and pitch diameters for metric and unified screw threads.

Calculate minimum shaft diameter from torque and allowable shear stress.

Calculate soil compaction percentage from wet density, dry density, and optimum moisture.

Size a solar panel system from daily energy usage, sun hours, and panel wattage.

Calculate solenoid pull force from coil turns, current, area, and plunger position.

Calculate spring constant with inputs, formulas, and instant results.

Calculate compression spring rate from wire diameter, coil diameter, and active coils.

Convert between star (Y) and delta (triangle) resistor configurations.

Calculate stepper motor holding and pull-out torque from specs and operating conditions.

Size storm drains using the Rational Method from rainfall intensity and drainage area.

Calculate stress strain with inputs, formulas, and instant results.

Convert between Ra, Rz, RMS, and other surface roughness parameters.

Calculate three phase power with inputs, formulas, and instant results.

Calculate worst-case and statistical tolerance stack-up for assembled parts.

Calculate torsion shear stress with inputs, formulas, and instant results.

Calculate traffic flow rate, density, and speed using the fundamental traffic flow equation.

Calculate green, yellow, and all-red phase timing for traffic signal intersections.

Calculate transformer turns ratio, voltage, and current from primary and secondary specifications.

Calculate transformer turns ratio with inputs, formulas, and instant results.

Calculate UPS backup runtime from battery capacity, load, and efficiency.

Convert between dynamic and kinematic viscosity units including cP, cSt, Pa·s, and Stokes.

Calculate voltage divider with inputs, formulas, and instant results.

Calculate flow rate over rectangular, V-notch, and Cipolletti weirs from head measurement.

Calculate weld joint strength from weld size, length, and material properties.

Calculate unknown resistance in a Wheatstone bridge from three known resistances.

Calculate worm gear ratio, lead angle, and efficiency from worm and wheel parameters.