Why is the food calorie actually a kilocalorie?

The "calorie" on a food label is 1000 thermochemical calories (1 kcal). We expose both so labels match.

How do I convert kWh to BTU for HVAC sizing?

Pick kWh as the source and BTU as the target. 1 kWh ≈ 3412 BTU.

eV is the energy unit of choice in atomic and particle physics. 1 eV = 1.602176634 × 10⁻¹⁹ J.

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Base unit: J · 11 units

From

kcal — Kilocalorie (food)Thermal

418.4

kJ — KilojouleSI

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