Engineering tools
40 free conversion, calculation and identification tools; no membership required.
555 timer
555 Timer
Monostable pulse duration and classic astable period, frequency and duty cycle.
Open tool →CalculationResistive attenuator
Attenuator Tee Pi Bridged Reflection
Attenuator network resistances for equal input and output impedances.
Open tool →CalculationEstimated battery life
Battery Life
Estimate runtime from capacity, average current and usable capacity.
Open tool →ConversionCapacitance conversion
Capacitance
Convert capacitance between selected source and target units to compare datasheets.
Open tool →CalculationCapacitor discharge
Capacitor Discharge
Time to reach a target capacitor voltage, or resistance needed for a specified time.
Open tool →CalculationCurrent divider
Current Divider
Current in two parallel resistive branches.
Open tool →ConversiondBm and watts conversion
dBm Watts
Convert absolute power relative to one milliwatt.
Open tool →ConversionDecimals and fractions
Decimal Fraction
Convert decimals to the nearest fraction with a limited denominator, or fractions to decimals.
Open tool →IdentificationPlug identification guide
Electrical Plug Reference
Identify plug type, pin count and grounding by type designation.
Open tool →ConversionEnergy conversion
Energy
Convert energy between selected source and target units to compare datasheets.
Open tool →ConversionForce conversion
Force
Convert force between selected source and target units to compare datasheets.
Open tool →ConversionFrequency, wavelength and period
Frequency Wavelength Period
Frequency and wavelength relationship for a specified propagation speed.
Open tool →ConversionInductance conversion
Inductance
Convert inductance between selected source and target units to compare datasheets.
Open tool →CalculationLED series resistor
LED Series Resistor
Current-limiting resistance and dissipation for an LED string.
Open tool →ConversionLength conversion
Length
Convert length between selected source and target units to compare datasheets.
Open tool →CalculationLow-pass and high-pass filters
RC RL Low High Pass Filter
The −3 dB cutoff frequency of a first-order RC or RL circuit.
Open tool →ConversionNumber base conversion
Number Binary Hex Octal
Convert non-negative integers between bases 2, 8, 10 and 16, with logical shifts.
Open tool →CalculationOhm's law and DC power
Ohms Law Power
Find voltage, current, resistance and power in a resistive circuit from two independent quantities.
Open tool →CalculationSeries and parallel resistors
Series Parallel Resistor
Equivalent resistance of ideal resistors.
Open tool →CalculationPCB trace width
PCB Trace Width IPC-2221
Preliminary internal and external copper trace width estimates using the IPC-2221 empirical relationship.
Open tool →ConversionPressure conversion
Pressure
Convert pressure between selected source and target units to compare datasheets.
Open tool →CalculationReactance and susceptance
Reactance Susceptance
Ideal inductive and capacitive reactance at the selected frequency.
Open tool →IdentificationResistor colour code
Resistor Color Code
Identify four-, five- or six-band resistor values, reading from the first band.
Open tool →CalculationSeries and parallel capacitors
Series Parallel Capacitor
Equivalent capacitance of ideal capacitors.
Open tool →IdentificationSMD capacitor code
SMD Capacitor Code
Read numeric capacitance codes, decimal R notation and EIA-198 letter codes.
Open tool →IdentificationSMD resistor code
SMD Resistor Code EIA96
Read three-/four-digit codes, decimal R notation and EIA-96.
Open tool →ConversionTemperature conversion
Temperature
Convert Celsius, Fahrenheit and kelvin with an absolute-zero check.
Open tool →CalculationPower Three-phase
Three Phase Power
Apparent, active, reactive and output power from line voltage and current.
Open tool →CalculationRC time constant
RC Time Constant
Time constant and capacitor voltage during ideal charging or discharging.
Open tool →CalculationPCB trace impedance
PCB Trace Impedance
Approximate single-ended microstrip or symmetrical stripline impedance.
Open tool →CalculationVoltage divider
Voltage Divider
Output voltage across the lower resistor of an unloaded divider.
Open tool →ConversionVolume conversion
Volume
Convert volume between selected source and target units to compare datasheets.
Open tool →ConversionMass conversion
Weight Mass
Convert mass between selected source and target units to compare datasheets.
Open tool →ConversionAWG wire size
Wire Size AWG
Diameter and cross-sectional area of solid round wire by AWG.
Open tool →Conversion4–20 mA scaling
4-20 mA Scaling
Convert transmitter current to engineering units and vice versa.
Open tool →ConversionLinear scaling and 0–10 V signals
Linear PLC Scaling
Scale PLC counts, voltage or any two linear ranges.
Open tool →IdentificationIPv4 subnet
IPv4 Subnet CIDR
Network address, mask and full address range.
Open tool →CalculationVision image resolution
Vision Pixel Resolution
Physical size per pixel along one field-of-view axis.
Open tool →CalculationMotor synchronous speed
Synchronous Motor RPM
Rotating field speed from frequency and pole count.
Open tool →CalculationCable voltage drop
Copper Voltage Drop
Resistive voltage-drop estimate for copper cable using one-way length.
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