| 1 mg/m³ = | 0.001 g/m³ |
| 1 mg/m³ = | 0.00000169 lb/cu yd |
| 1 mg/m³ = | 0.000001 kg/m³ |
| 1 mg/m³ = | 0.000001 mg/cm³ |
| 1 mg/m³ = | 0.000000134 oz/gal |
| 1 mg/m³ = | 0.0000000624 lb/cu ft |
| 1 mg/m³ = | 0.00000000835 lb/gal |
| 1 mg/m³ = | 0.000000001 g/cm³ |
| 1 mg/m³ = | 0.0000000000361 lb/cu in |