Calculators & Conversion Charts

Farnell's online conversion calculators and conversion tables provide the conversion ratios you need for your everyday calculations.

Whether you're trying to move from imperial measurements to metric, solve for Ohm's law, or make sure you've got the correct weight, these tools are designed to help.

555 Timer

555 Timer

555 Timer Calculator.

555 Timer Calculator
American Wire Gauge

American Wire Gauge

American Wire Gauge Conversion Calculator.

AWG Calculator
Battery Life

Battery Life

How much life is in that battery based on its use?

Battery Life Calculator
Capacitor Charge

Capacitor Charge Calculator

Calculate time and energy needed to charge a capacitor.

Capacitor Charge Calculator
Capacitor

Capacitor Conversion Tool

Convert between uF, nF and pF.

Capacitor Conversion Chart
decibel to watt calculator

dBm to Watts

Converts between dBm and watts.

dBm to Watts Calculator
Energy

Energy

BTUs, Joules, and kWh - dynamically computed as you type!

Energy Calculator
Fractions

Fractions and Decimal

Turn any decimal value into its simplified fraction form.

Fraction - Decimal Conversion
Impedance Matching

Impedance Matching Calculator

Impedance matching allows maximum power transfer between two points.

Impedance Matching Calculator
Inductance

Inductance Conversion

Turn any Inductance Conversion value into its simplified form.

Inductance Conversion
LED Series Resistor

LED Series Resistor

Calculate appropriate resistance so your LEDs don't burn out prematurely.

LED Series Resistor Calculator
Length

Length

Inches? Feet? Yards? Miles? Meters? Metres? We've got you covered.

Length Calculator
Mass and Weight

Mass and Weight

Move seamlessly from ounces to pounds to grams.

Mass and Weight Calculator
Metric/Imperial Conversion

Metric and Imperial

Common Metric and Imperial conversion ratios and calculator.

Metric and Imperial Conversion
Ohm's Law

Ohm's Law

Save time with this quick tool to find your circuit values.

Ohm's Law Calculator

Op-Amp Voltage and Gain Calculator

Op-Amp Voltage and Gain Calculator

Op-Amp Voltage and Gain Calculator
Passive Filter Calculator

Passive Filter Calculator

Calculate the cut-off frequency and phase shift of a Passive RC Filter.

Passive Filter Calculator
PCB Trace Width Calculator

PCB Trace Width Calculator

Calculate Printed Circuit Board Width(IPC-2221).

PCB Trace Width Calculator
Power

Power

Get your power converted down to a base number, quickly and easily.

Power Calculator
Pressure

Pressure

Convert millibars to kilopascals and vice versa.

Pressure Calculator
Pull-up & Pull-down Resistors Calculator

Pull-up & Pull-down Resistors Calculator

Calculate the Pull-up & Pull-down resistor value.

Pull-up & Pull-down Resistors
Resistor Colour Code

Resistor Colour Codes

Access a convenient and standardised resistance table.

Resistor Colour Calculator
Series/Parallel Capacitance

Series/Parallel Capacitance

Calculate overall capacitance value.

Series/Parallel Capacitance
Stepper Motor

Stepper Motor

Calculate speed and time per step and max power of a stepper motor.

Stepper Motor Calculator
Temperature

Temperature

For any critical temperature analysis, this calculator helps you get your job done faster.

Temperature Calculator
Terms and Measurements

Terms and Measurements

Not sure about one of the terms in our calculators?

Terms and Measurements
Time Constant

Time Constant

Voltage x Capacitance x Load Resistance.

Time Constant Calculator
Time Constant

Transformer Turns Calculator

Calculate the primary and secondary full-load currents of the transformer.

Transformer Turns Calculator
Twisted-Pair Impedance Calculator

Twisted-Pair Impedance Calculator

Calculate the characteristic impedance of a twisted-pair cable.

Twisted-Pair Impedance Calculator
Volume Calculator

Volume Calculator

BTUs, Joules, and kWh - dynamically computed as you type!

Volume Calculator

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