Conversion Factors for Mass and Density (FAQ - Mass & Density)
Conversion Factors for Mass and Density
Historically there have been a variety of units of mass and density, and approximate conversion factors to some of these are given in Table 1 and Table 2 respectively. Exact conversions are shown in bold, others are quoted to seven significant figures.
Table 1: Some mass conversion factors from non-SI units
| Unit | Symbol | Equivalent SI Value |
| grain | gr | 64.798 91 mg |
| metric carat | CM | 200.0 mg |
| ounce (avdp) | oz | 28.349 52 g |
| ounce (troy) (= 480 gr) | oz tr | 31.103 48 g |
| pound (avdp) | lb | 453.592 37 g |
| slug | slug | 14.593 90 kg |
| tonne | t | 1 000.0 kg |
| ton (= 2 240 lb) | ton | 1 016.047 kg |
Table 2: Some density conversion factors from non-SI units
| Unit | Symbol | Equivalent SI Value |
| pound per cubic foot | lb·ft-3 | 16.018 46 kg·m-3 |
| slug per cubic foot | slug·ft-3 | 515.378 8 kg·m-3 |
| pound per cubic inch | lb·in-3 | 27 679.90 kg·m-3 |
Last Updated: 25 Mar 2010
Created: 9 Aug 2007