Electronics and Engineering Calculators

3D Print Cost Calculator Estimate the cost of a 3D print from its filament weight, spool price, printer power, print time, electricity price, printer wear and a failure margin.

555 Timer Calculator Calculate the frequency, duty cycle and high and low times of an astable 555 timer, or the pulse width of a monostable one, from its resistors and capacitor.

AWG to mm² Wire Table Convert AWG wire gauge to diameter in mm and mil and to cross-section in mm², for AWG 0000 to 40, or find the AWG nearest a mm² cross-section.

Battery Life Calculator Estimate how long a battery lasts from its capacity, the active and sleep currents and the duty cycle, with a derating factor for the capacity a real load gets.

Cable Size Calculator Find the minimum cable cross-section in mm² for a single or three-phase circuit from power or current, supply voltage, length and allowed voltage drop.

Capacitor Code Calculator Read a three-digit capacitor marking such as 104K, or turn a value such as 100 nF into its code, with the tolerance and voltage letters explained.

Capacitor Energy and Charge Calculator Enter a capacitance in microfarads and a voltage to get the energy and charge stored, and the energy released when the capacitor discharges to a lower voltage.

Decibel Calculator Convert power and voltage ratios to decibels, dBm to watts, dBV and dBu to volts, and add the decibel levels of incoherent sources. The working is shown.

Free-Space Link Budget Calculator Enter frequency, distance, transmit power, antenna gains, cable losses, receiver sensitivity for the ITU-R P.525 path loss, received power and link margin.

Heat Conduction Calculator Enter the material, area, thickness and temperature difference of a flat wall to get the heat flow in watts, the energy in a day and the thermal resistance.

LC Resonance Calculator Find the resonant frequency of an LC circuit, or the L or C that tunes it to a target. With a resistor it adds the Q factor and bandwidth. Accepts 5k and 10µ.

LED Resistor Calculator Find the series resistor for one or more LEDs from the supply voltage and the LED current. Get the nearest E24 value, its power and a wattage with a margin.

Manning Open Channel Flow Calculator Enter the shape, size, depth, slope and roughness n of a rectangular, trapezoidal or circular channel for its discharge and velocity by Manning's equation.

Moment of Inertia and Section Modulus Calculator Enter a rectangle, hollow rectangle, circle, hollow circle or I-beam in mm for its second moment of area I and section modulus S, with the area and steps.

Ohm's Law Calculator Enter any two of voltage, current, resistance and power and get the other two, with the power formulas and each step written out. Accepts 4k7 and 10m.

Op-Amp Gain Calculator Find the gain and output voltage of inverting, non-inverting, follower, differential and summing op-amp circuits, and E12 or E24 resistor pairs for a gain.

Open Belt Length and Speed Calculator Enter two pulley diameters, the centre distance and the driver speed to get the open belt length, the wrap angles and the driven speed, with each step.

PCB Trace Width Calculator Find the minimum PCB trace width for a current, temperature rise and copper weight with the IPC-2221 formula, and the trace resistance and voltage drop.

Pipe Head Loss Calculator Enter the flow, inside diameter, length and roughness C of a water pipe for the friction head loss by the Hazen-Williams formula, with velocity and steps.

Power Factor Calculator Solve the power triangle from any two of kW, kvar, kVA and cos φ, then size the capacitor bank, in kvar and µF, that corrects the power factor to a target.

PT100 Temperature Calculator Pick a Pt100 or Pt1000 sensor and a temperature to get its resistance by the Callendar-Van Dusen equation of IEC 60751, with a table from -200 to 500 °C.

RC Time Constant Calculator Work out the RC time constant, the charging or discharging voltage at any time, the time to reach a level and the low-pass cutoff, with the curve drawn over 5τ.

Reactance Calculator Work out inductive and capacitive reactance at a frequency, then the impedance and phase angle of a series or parallel R, L and C circuit. Accepts 4k7 and 100µ.

Resistor Colour Code Calculator Read a resistor's value, tolerance and temperature coefficient from its colour bands, or type a value to get the bands, for 4, 5 and 6-band resistors.

Reynolds Number Calculator Enter the water temperature, the flow and the pipe diameter to get the Reynolds number, the flow regime, the velocity and the viscosity of the water.

Series and Parallel Resistor Calculator Add resistors, capacitors or inductors in series and in parallel. Paste a list of values and get both totals, with the formula and the working for each.

Thermal Expansion Calculator Enter a solid, its length and volume and the temperature change to get how much it grows or shrinks, from the linear and volume expansion coefficients.

Three-Phase Power Calculator Work out the real, reactive and apparent power of a balanced three-phase load from voltage, current and power factor, or the current from kW, for star or delta.

Transformer Calculator Work out the turns ratio, voltages and currents of a transformer, its VA rating and, with the efficiency, the input power and the losses. Each step is shown.

Voltage Divider Calculator Work out the output of a two-resistor divider, the effect of a load, or the R2 needed for a target voltage, with the nearest E24 resistor values and the steps.

Voltage Drop Calculator Find the voltage drop along a cable and its percentage of the supply, single-phase or three-phase, from length, mm² or AWG size, current and temperature.

Electronics & Engineering

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Electronics & Engineering

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