Mass Standards & SI Weight Guide

Mass vs. Weight: A Scientific Distinction

In engineering and physics, mass is an intrinsic property of an object (measured in kilograms), while weight is the force exerted on that mass by gravity. This converter follows the SI standards for mass-based conversions.

The Modern Kilogram (SI Standard)

As of 2019, the kilogram is no longer defined by a physical object. It is now technically anchored to the Planck constant (h), ensuring that measurement standards remain constant across the universe without the decay of a physical prototype.

Avoirdupois vs. Metric Scales

The Avoirdupois system (Pound, Ounce) is the primary weight standard in the US and UK. Our tools use the 1959 international standard where 1 pound is exactly 0.45359237 kilograms.