ELECTRICAL, MECHANICAL & CNC INSTRUMENTS / 22 TOOLS
Electrical, Mechanical & Fabrication Engineering Calculators
Engineering design and shop-floor fabrication require verifiable physical equations where every constant, unit conversion, and safety factor is explicitly stated. Whether you are checking NEC branch-circuit voltage drop over long conduit runs, sizing cold-weather solar PV open-circuit voltage (Voc) strings, or computing K-factor sheet metal bend allowances, precision is mandatory.
Our Engineering Calculators cover electrical circuits, off-grid solar storage, mechanical power transmission (pulleys, gears, timing belts), structural beam deflection (L/360 limits), welding heat input (kJ/mm), and additive/subtractive manufacturing (CNC IPM feed rates and 3D filament volume).
Select an engineering instrument below to inspect the governing equation, test boundary parameters, and verify your technical specifications.
LED Current Limiting Resistor Calculator
Calculate exact series current-limiting resistor resistance (Ohms) and power dissipation rating (Watts) for LEDs.
Open Calculator → 02Voltage Divider Calculator
Calculate output voltage (Vout), division ratio, and quiescent current for two-resistor voltage divider networks.
Open Calculator → 03Battery Runtime Calculator
Estimate battery operating runtime hours under continuous DC load considering Peukert effect and depth of discharge (DoD).
Open Calculator → 04Solar Panel String Sizing Calculator
Calculate max and min series panels per string to match MPPT solar charge controller voltage and low-temperature Voc limits.
Open Calculator → 05Solar Battery Bank Sizing Calculator
Calculate usable kWh and Amp-Hour (Ah) battery bank storage needed for off-grid homes and RVs with days of autonomy.
Open Calculator → 06Wire Gauge Voltage Drop Calculator
Calculate voltage drop percentage, conductor resistance, and power loss for AWG copper wire runs (NEC 3% branch limit).
Open Calculator → 07Subpanel Wire Size & Distance Calculator
Determine feeder wire gauge (AWG/kcmil Copper or Aluminum) and conduit size for 50A, 60A, 100A subpanels with distance voltage drop.
Open Calculator → 08Sheet Metal Bend Allowance Calculator
Calculate bend allowance (BA), bend deduction (BD), and flat pattern layout length using material thickness and K-Factor.
Open Calculator → 09Minimum Bend Radius Calculator
Estimate minimum inside forming bend radius for sheet metals and hydraulic hoses without cracking or wall thinning.
Open Calculator → 10Timing Belt Length Calculator
Calculate standard pitch belt length and tooth count for GT2, HTD, and T5 belt pulley center-to-center transmissions.
Open Calculator → 11Pulley Ratio & RPM Calculator
Calculate driven RPM, speed reduction ratio, and output torque multiplication for V-belt and flat belt drive systems.
Open Calculator → 12Gear Ratio & Speed Calculator
Calculate gear ratio, output shaft speed, and torque output for spur, helical, bevel, and planetary gear sets.
Open Calculator → 13Shaft Speed Calculator
Calculate shaft rotational speed (RPM), surface linear speed (SFM / m/s), and angular velocity (rad/s).
Open Calculator → 143D Printing Filament Cost Calculator
Calculate exact material filament cost, electricity consumption, and total part production cost from slicer gcode weight.
Open Calculator → 153D Printing Material Volume Calculator
Convert 3D print mass into volumetric cubic centimeters (cm³) and linear meters of 1.75mm / 2.85mm filament based on polymer density (PLA, PETG, ABS, TPU).
Open Calculator → 163D Printing Bed Leveling Calculator
Convert probe mesh corner height variance (mm) into exact screw turn fractions (e.g. 1/4 turn CW / CCW on M3/M4 threads).
Open Calculator → 17CNC Feed and Speed Calculator
Calculate milling feed rate (IPM / mm/min), spindle RPM, and chip load for end mills cutting Aluminum, Hardwood, Acrylic, and Steel.
Open Calculator → 18Laser Cutting Material Cost Calculator
Calculate raw sheet utilization, cutting time cost, and unit production quote for CO2 and fiber laser cutting orders.
Open Calculator → 19Welding Heat Input Calculator
Calculate welding heat input in kJ/mm and kJ/in for SMAW, GMAW (MIG), GTAW (TIG), and SAW welding procedure specifications (WPS).
Open Calculator → 20Bolt Torque Calculator
Calculate recommended tightening torque (ft-lbs and Nm) for Grade 5, Grade 8, and Metric 8.8/10.9 bolts based on preload clamp force.
Open Calculator → 21Pipe Flow Rate Calculator
Calculate volumetric water flow rate in Gallons Per Minute (GPM) and Liters Per Second from inside pipe diameter and fluid velocity.
Open Calculator → 22Beam Deflection Calculator
Calculate maximum center deflection (inches/mm) and bending stress for a simply supported beam with center point load.
Open Calculator →