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These units form the basis for the Imperial system formerly used in Commonwealth countries and U.S. customary system used in the US.
The basic difference between dimensional systems is not in the units employed but in the primary dimensions.
Note that the use of four, three, two or even one(!) primary quantities is a human choice and not basic nature.
| Primary Quantity | Dimensions | Common Units |
| Force | F | pound-force |
| Mass | M | ounce, pound, slug, ton |
| Length | L | inch, foot, yard rod, chain, furlong, mile |
| Time | T | second, minute hour, day |
Some common imperial secondary quantities:
| Primary Quantity | Dimensions | Common Units |
| Acceleration | L / T2 | foot per second squared |
| Area | L2 | square foot, square yard acre, square mile |
| Density | M / L3 | pounds per cubic foot |
| Frequency | 1/T | cycle per second |
| Impulse | F T | pound-force second |
| Momentum | ML / T | pound foot per second |
| Power | LF / T | foot pound-force per second horsepower |
| Pressure | F / L2 | pound-force per square inch |
| Velocity | L / T | foot per second mile per hour, knot |
| Volume | L3 | pint, quart, gallon cubic foot, cubic yard |
| Work | L F | foot pound-force |
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