| Abbreviations for Compound Units |
| degrees C | degrees Celsius |
| degrees F | degrees Fahrenheit |
| A | ampere(s) |
| atm | standard atmosphere |
| AU | astronomical unit |
| bbl | barrel(s) |
| Bcf | billion cubic feet (gas flow) |
| Bcfd | billion cubic feet per day (gas flow) |
| Bcfy | billion cubic feet per year (gas flow) |
| Btu | British thermal unit(s) |
| Bunit | billion unit(s) |
| c | cycle(s) |
| c | centi (one-hundredth); prefix only |
| C | coulomb(s) |
| cal | calorie(s) |
| cd | candela(s) |
| Ci | curie(s) |
| cmil | circular mil |
| cp | candlepower |
| cpm | count(s) per minute |
| cps | count(s) per second |
| d | day(s) |
| d | deci (one-tenth); prefix only |
| D | darcy(s) |
| dB | decibel(s) |
| dyn | dyne(s) |
| eV | electron volt(s) |
| F | fermi(s) |
| F | farad(s) |
| fc | footcandle(s) |
| fl oz | fluid ounce(s) |
| ft | foot/feet |
| ft/s | foot/feet per second |
| ft2 | square foot/feet |
| ft-lbf | foot pound(s) (force) |
| g | gram(s) |
| g, G | Gal (gravity constant) |
| G | giga (one billion); prefix only |
| gal | gallon(s) |
| Gs | gauss |
| h | hour(s) |
| ha | hectare(s) |
| H.E. | high explosive(s) |
| hp | horsepower |
| hp-h | horsepower hour |
| Hz | cycle(s) per second |
| in Hg | inch(es) of mercury |
| in | inch(es) |
| in H2O | inch(es) of water |
| J | joule(s) |
| k | kilo (one thousand); prefix only |
| K | kelvin |
| l | liter(s) |
| L | liter(s) (preferred form) |
| L | lambert(s) |
| lb | pound(s) |
| lbf | pound(s) force |
| lbf-ft | pound(s) force foot |
| lt | long ton(s) |
| m | meter |
| m | milli (one-thousandth); prefix only |
| M | mega (one million) |
| Mcf | thousand cubic feet (gas flow) |
| Mcfd | thousand cubic feet per day |
| mho | mho(s) |
| mi | mile(s) |
| mil | thousandth of an inch |
| MMbbl | million barrels |
| MMcf | million cubic feet (gas flow) |
| MMcfd | million cubic feet per day (gas flow) |
| MMcfy | million cubic feet per year (gas flow) |
| mol | mole(s) |
| mol wt | mole weight |
| mol % | mole percent |
| mpg | mile(s) per gallon |
| mph | mile(s) per hour |
| Mx | maxwell(s) |
| n | nano (one-billionth); prefix only |
| n | refractive index |
| N | Newton(s) |
| nmi | nautical mile(s) |
| Oe | oersted(s) |
| ohm-cmil/ft | ohm circular mil per foot |
| oz | ounce(s) |
| p | pico (one-trillionth); prefix only |
| P | poise(s) |
| Pa | pascal(s) |
| pct | percent |
| ppb | part(s) per billion |
| ppm | part(s) per million |
| psi | pound(s) (force) per square inch |
| psia | pound(s) force per square inch, absolute |
| psig | pound(s) force per square inch, gauge |
| r | revolution(s) |
| R | roentgen(s) |
| rad | radian(s) |
| rpm | revolutions per minute |
| s | second(s) |
| S | siemens(s) |
| sr | steradian(s) |
| st | stere(s) |
| st | short ton(s) |
| St | stokes |
| std ft3 | standard cubic foot/feet |
| t | metric ton(s) |
| t/w-h | metric ton(s) per worker hour |
| t/w-d | metric ton(s) per worker day |
| T | tesla(s) |
| tr oz | troy ounce(s) |
| unit-1 | reciprocal unit |
| unit2 | square unit (or unit squared) |
| unit3 | cubic unit |
| W | watt(s) |
| Wb | weber(s) |
| wt %, wt pct | weight percent |
| yd | yard(s) |
| yr | year(s) |