These are some alternative, non SI metric units that are in common use…
| Quantity | Unit | Symbol | Alternative | Unit |
| Length | angstrom | Å | 1.00E-10 | metres |
| Length | micron | µ | 1.00E-06 | metres |
| Volume | litre | l | 1.00E-03 | metres³ |
| Area | are | a | 100 | metres² |
| Mass | tonne | t | 1000 | kg |
| Force | dyne | 1.00E-05 | N | |
| Pressure | Pascal | Pa | 1 | N/m² |
| Pressure | bar | bar | 105 | N/m² |
| Energy | erg | 1.00E-07 | joules | |
| Viscosity (dynamic) | centipoise | cP | 1.00E-03 | Ns/m² |
| Viscosity (kinetic) | centistrokes | cSt | 1.00E-06 | m²/s |
| Electrical Conductivity | siemens | S | 1 | 1/W |
| Magnetic Field Strength | oersted | 1000/4p | A/m | |
| Magnetomotive Force | gilbert | 10/4p | A | |
| Magnetic Flux Density | gauss | 1.00E+04 | Tesla | |
| Magnetic Flux | maxwell | 1.00E-08 | Wb | |
| Luminance | nit | nt | 1 | cd/m² |
| Luminance | stilb | 1.00E+04 | cd/m² |