Engineering calculators

Solve for voltage, current, or resistance in a simple DC circuit using V = I × R.

Decode resistor color bands into resistance, tolerance, multiplier, and expected measurement range.

Calculate output voltage, resistor ratio, load effect, and divider current for a two-resistor network.

Calculate RC time constant, charge curve, discharge curve, cutoff frequency, and capacitor response.

Calculate power factor, real power, reactive power, apparent power, and correction capacitor context.

Estimate voltage drop from current, wire length, conductor size, material, and allowable loss.

Estimate beam bending moment from span, load type, support condition, and position.

Calculate beam shear force from load pattern, support reactions, span, and section location.

Calculate voltage, current, resistance, and electrical power relationships from any two known values.

Calculate stored magnetic energy from inductance and current, with unit-aware engineering context.

Calculate fluid velocity from flow rate and pipe area, with unit conversion and hydraulic context.

Calculate torque from force and lever arm distance, including angle and unit conversion context.

Calculate gear ratio, output speed, torque multiplication, and driven gear relationship.

Estimate uniform beam load, reaction forces, bending moment, and safety check inputs.

Estimate voltage drop from current, wire length, conductor resistance, and circuit voltage.

Estimate wire size planning value from current, distance, voltage drop target, and material.

Estimate heat loss through surfaces from area, U-value, and indoor-outdoor temperature difference.

Estimate pump horsepower from flow rate, head, fluid density, and efficiency.

Check whether a formula-style relationship is dimensionally plausible using educational unit exponents.

Estimate propagated uncertainty for sums, products, ratios, and powers in student lab measurements.

Estimate instrument resolution uncertainty, percent error, and reporting precision from measured values.

Estimate worst-case and root-sum-square tolerance buildup across experimental or engineering components.

Estimate sensor drift, recalibration interval pressure, and measurement deviation over time.

Estimate experimental battery runtime from capacity, load, efficiency, cutoff, and safety margin.

Estimate signal-to-noise ratio, averaging benefit, and detection threshold for experimental measurements.

Estimate prototype iteration cost from parts, labor, failure rate, testing cycles, and contingency.

Calculate torque, lever arm, applied force, and angle effect for mechanics problems.

Estimate moment of inertia for rods about center or end axes using mass and length.

Calculate capacitance from plate area, separation, dielectric constant, and stored energy context.

Calculate energy stored in a capacitor from capacitance, voltage, and charge.

Calculate RC circuit time constant, charge percentage, and settle-time estimates.

Calculate RL circuit time constant, current response, and settling behavior.

Calculate inductive reactance from frequency and inductance for AC circuit analysis.

Calculate capacitive reactance from frequency and capacitance for AC circuit analysis.

Calculate resonant frequency, angular frequency, and tuning sensitivity for LC circuits.

Estimate voltage, current, and impedance transformation from primary and secondary turns.

Calculate three-phase real power, apparent power, current, voltage, and power factor.

Estimate capacitor kVAR required to improve power factor and reduce apparent power.

Calculate series resistor value, resistor power, and current safety margin for LED circuits.

Estimate battery charge or discharge current, runtime, and C-rate stress from capacity.

Estimate length, area, or volume expansion from coefficient and temperature change.

Calculate conduction heat flow through a material from conductivity, area, thickness, and temperature difference.

Estimate convective heat transfer from coefficient, surface area, and temperature difference.

Estimate thermal radiation heat transfer from emissivity, area, and temperature difference.

Calculate Reynolds number from velocity, length scale, density, and viscosity.

Estimate pressure, velocity head, elevation head, and energy balance in ideal flow.

Estimate volumetric flow rate from pipe diameter, velocity, and cross-sectional area.

Calculate CIDR subnet ranges, usable hosts, network address, broadcast address, and mask details.

Generate strong password options from length, character sets, entropy target, and security constraints.