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Calculators Metric & imperial

Universal Unit Converter

Just say what you want. Type 10 km to miles, 100 F to C, or 255 to hex and get the answer. Twenty-four categories, every unit worth knowing, exact math, and the odd complex one too.

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Pick a category and type a value in any box; every other unit updates at once.

Glass thickness for the trade

Millimetres to decimal inches to the nearest fraction, with the ASTM C1036 nominal call-out.

Straight, honest math. Every result uses the exact standard factor (1 inch = 25.4 mm, 1 psi = 6 894.757 Pa, 1 kWh = 3.6 MJ, and so on). Temperature, fuel economy and number bases use their proper formulas, not a factor. Nothing is rounded to a "trade" value for you, so check against your job's spec before you cut, pour, or ship.
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