PCB Unit Converter
Convert PCB dimensions and electrical quantities using defined unit factors. Absolute temperature and temperature difference have separate conversion rules.
11 quantity groups. Squared area factors.
No temperature offset applied to ΔT.
Keep units consistent across your design.
Use a decimal point or scientific notation, such as 1e-6. Select a quantity before choosing its units.
Use the right dimension and the right zero.
Linear quantities convert through their base-unit factors. Area factors are squared. No conversion between unrelated dimensions is offered. NIST conversion reference
Results use JavaScript double-precision arithmetic and are displayed with up to 12 significant digits. Display rounding does not establish measurement precision; the swap operation uses the unrounded computed value.
Length: 1 in = 25.4 mm; 1 mil = 0.0254 mm Area: 1 in² = (25.4 mm)² = 645.16 mm² Absolute temperature: °F = °C × 9/5 + 32 K = °C + 273.15 Temperature difference: Δ°F = Δ°C × 9/5 ΔK = Δ°C No +32 or +273.15 offset for a difference.
Input behavior
Empty fields, invalid numbers, non-finite results and values below absolute zero are rejected. Negative values are accepted for purely arithmetic linear conversions. The converter does not infer whether a negative resistance, length or component value is meaningful in your application.
Examples you can check
6 mil = 0.1524 mm; 100 nF = 0.1 µF; 1 ns = 1000 ps; 2.4 GHz = 2400 MHz. Frequency-to-period conversion is a reciprocal relationship, not a unit conversion, and is not included.
Questions before
you use the result.
Know what the tool answers—and what still needs engineering review.
Does mil mean millimeter?
No. A PCB mil, also called a thou, is one thousandth of an inch: exactly 0.0254 mm.
Why is a temperature-rise result different from an absolute-temperature result?
Temperature differences change by a scale factor only. Absolute temperatures also include the offset between the Celsius, Fahrenheit and kelvin zero points.
Are the displayed digits an accuracy guarantee?
No. Defined conversion factors can be exact, but software arithmetic is finite precision and measured inputs have their own uncertainty.
Technical references & data basis
Use the linked references to check unit conventions and calculation inputs. Confirm dimensions and tolerances in your design files before requesting a quotation.