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[Utilities]
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Utilities

Convert engineering quantities across 18 categories — length, mass, pressure, energy, power, flow and more — with SI/NIST-exact conversion factors.

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One bar is not one atmosphere: 1 atm = 1.01325 bar. A 1.3% slip that goes unnoticed until it meets a vacuum spec or a combustion calculation.

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Results are indicative

Figures assume typical conditions and the stated method. For measured, guaranteed numbers on your plant, our engineers run site surveys, heat loss audits, and full process models.

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A units mistake is the cheapest way to ruin a good calculation. This converter covers 18 categories of engineering quantities — length, area, volume, mass, density, pressure, temperature, energy, power, flow and more — with conversion factors that are SI/NIST-exact.

Method

Every unit maps to its category's base unit through an affine relation (a factor plus, where needed, an offset — which is how °C, °F and K interconvert correctly). Conversions run through the base unit, so any-to-any conversion inside a category is exact to the published factor. Energy units follow the International Table convention for the BTU and calorie.

Pick a category first; the From and To lists then show only compatible units, which makes dimensionally invalid conversions impossible to request.

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Frequently asked questions

Factors are SI/NIST-exact where an exact definition exists (inch, pound, bar) and follow the International Table convention for the BTU and calorie. Temperature conversions handle the °C/°F/K offsets exactly rather than as pure multipliers.

Units only interconvert within a category — pressure to pressure, energy to energy. The category selector enforces this, which is a feature: it makes dimensionally invalid conversions impossible rather than silently wrong.