- Pace (Geometrical) (Length)
- Pace (US, Survey) (Length)
- Palm (Length)
- Parsec (Length)
- Pascal (Pressure)
- Pascal second (Dynamic Viscosity)
- Pecks (Brit) (Volume)
- Pecks (US) (Volume)
- Pennyweights (troy) (Weight)
- Perch (US Survey) (Length)
- Pints (Brit) (Volume)
- Pints (US, dry) (Volume)
- Pints (US, liq) (Volume)
- Points (Printing) (Length)
- Poise (Dynamic Viscosity)
- Pole (US Survey) (Length)
- Pound force (Force)
- Pound force foot per inch (Force)
- Pound force seconds/ft
^{2}(Dynamic Viscosity) - Pound force seconds/in
^{2}(Dynamic Viscosity) - Pound force/foot
^{2}(Pressure) - Pound force/inch
^{2}(psi) (Pressure) - Pound/foot hour (Dynamic Viscosity)
- Pound/foot second (Dynamic Viscosity)
- Pound/foot
^{3}(Density) - Pound/hour (Mass Flow)
- Pound/inch second (Dynamic Viscosity)
- Pound/inch
^{3}(Density) - Pound/minute (Mass Flow)
- Pound/second (Mass Flow)
- Poundal (Force)
- Poundal seconds/ft
^{2}(Dynamic Viscosity) - Poundal/square foot (Pressure)
- Poundal/square inch (Pressure)
- Pounds (apoth) (Weight)
- Pounds (avdp) (Weight)
- Pounds (troy) (Weight)
- Pounds water/minute (Volume Flow)
- Prony (Power)

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