Unit conversion calculators

Unit conversions used in printed circuit board and circuit design. Convert between mil (thou) and mm, inches and mm, decibels and linear ratio, and copper weight in ounces to foil thickness. Enter a value and the result appears immediately.

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  Convert mm to mil

  Convert millimetres to mils instantly. 1 mm = 39.37 mil. The unit conversion you need for PCB trace width and clearance work, straight from the number you type.

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  Convert mil to mm

  Convert mils to millimetres instantly. 1 mil = 0.0254 mm. Common PCB values such as 4 mil and 30 mil are one keystroke away.

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  Convert mm to inches

  Convert millimetres to inches. The unit conversion used in PCB layout and mechanical design, with the result as you type.

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  Convert inches to mm

  Convert inches to millimetres. The unit conversion used in PCB layout and mechanical design, with the result as you type.

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  Capacitor code

  Read the 3-digit capacitor code and get the capacitance in µF. 104 = 0.1 µF, 472 = 4.7 nF, and so on.

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  Resistor code

  Read the 3-digit resistor code and get the resistance in kΩ. 103 = 10 kΩ, 472 = 4.7 kΩ, and so on.

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  Convert dB to ratio

  Convert decibels into a voltage ratio and a power ratio. −3 dB = 0.707×, 20 dB = 10×, all worked out as you type.

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  Convert voltage ratio to dB

  Convert a voltage ratio (V1/V2) into decibels. For amplifier gain and filter response measurements.

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  Convert power ratio to dB

  Convert a power ratio (P1/P2) into decibels. For RF and amplifier design work.

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  Convert oz to copper thickness

  Convert PCB copper weight in ounces to thickness in µm and mm. 1 oz = 35 µm. For reading board specifications and setting up trace width rules.