The unit on the left is equal to the conversion factor times the unit on the right.

Column1     Column2  	Conversion Factor

Inches	Centimeters	2.54
Meters	Centimeters	100
Miles	Feet	5280
Feet	Inches	12
Quarts	Cups	4
Pace	Centimeters	76.2
Paces	Chains(Gunter's)	0.03788
Paces	Chains(Ramden's)	0.025
Paces	Feet	2.5
Paces	Hands	7.5
Paces	Inches	30
Paces	Ropes (Brit)	0.125
Palmi (Ancient Rome)	Inches	2.9
Palmi (AncientRome)	Pes	0.25
Palms	Centimeters	7.62
Palms	Chains(Ramden's)	0.0025
Palms	Cubits	0.16667
Palms	Feet	0.25
Palms	Hands	0.75
Palms	Inches	3
Parsecs	Kilometers	3.084 x 10(13)
Parsecs	Miles (statute)	1.916 x 10(13)
Parts/billion	Milligrams/metric ton	0.90909
Parts/million	Grains/gal (Brit)	0.070155
Parts/million	Grains/gal (US)	0.05842
Parts/million	Grams/liter	0.001
Parts/million	Grams/ton (Met)	1
Parts/million	Milligrams/liter	1
Parts/million	Ounces (troy)/ton (S)	0.0292
Parts/million	Percent	0.0001
Parts/million	Pounds/million gal	8.245
Passus (Ancient Rome)	Feet	4.86
Passus (Ancient Rome)	Pes	5
Passus (Ancient Rome)	Stadium	0.008
Pecks (Brit)	Bushels (Brit)	0.25
Pecks (Brit)	Coombs (Brit)	0.0625
Pecks (Brit)	Cu cm	9092.17
Pecks (Brit)	Cu inches	554.84
Pecks (Brit)	Gallons (Brit)	2
Pecks (Brit)	Gills (Brit)	64
Pecks (Brit)	Hogsheads	0.03812
Pecks (Brit)	Kilderkins (Brit)	0.1111
Pecks (Brit)	Liters	0.90192
Pecks (Brit)	Pints	16
Pecks (Brit)	Quaterns (Brit, dry)	4
Pecks (Brit)	Quarters (Brit, dry)	0.03125
Pecks (Brit)	Quarts (Brit)	8
Pecks (Brit)	Quarts (US, dry)	8.2564
Pecks (US)	Barrels (US, dry)	0.07619
Pecks (US)	Bushels (US)	0.25
Pecks (US)	Cu cm	8809.77
Pecks (US)	Cu feet	0.31111
Pecks (US)	Cu inches	537.6
Pecks (US)	Gallons (US, dry)	2
Pecks (US)	Gallons (US, liq)	2.3273
Pecks (US)	Liters	8.8095
Pecks (US)	Pints (US, dry)	16
Pecks (US)	Quarts (US, dry)	8
Pennyweights	Drams (apoth or troy)	0.4
Pennyweights	Drams (avdp)	0.87771
Pennyweights	Grains	24
Pennyweights	Grams	1.55517
Pennyweights	Ounces (apoth or troy)	0.05
Pennyweights	Ounces (avdp)	0.05486
Pennyweights	Pounds (apoth or troy)	0.00417
Pennyweights	Pounds (advp)	0.003429
Perches	Cu feet	24.75
Pes (Ancient Rome)	Inches	11.7
Pes (Ancient Rome)	Palmi	4
Pes (Ancient Rome)	Passus	0.2
Petrograd standard	Cu feet	165
Phots	Foot-candles	929.03
Phots	Lumens/sq cm	1
Phots	Lumens/sq meter	10000
Phots	Lux	10000
Picas (printing)	Centimeters	0.42175
Picas (printing)	Points	12
Picul (Malaysia)	Kaits	100
Picul (Malaysia)	Kilogram	60.48
Picul (Malaysia)	Pound	133.33
Pie (Rome)	Inches	11.73
Pints (Brit)	Cu cm	568.261
Pints (Brit)	Gallons (Brit)	0.125
Pints (Brit)	Gills (Brit)	4
Pints (Brit)	Gills (US)	4.8038
Pints (Brit)	Liters	0.5682
Pints (Brit)	Minims	9600
Pints (Brit)	Ounces (Brit, flu)	20
Pints (Brit)	Pints (US, dry)	1.03206
Pints (Brit)	Pints (US, liq)	1.2009
Pints (Brit)	Quarts (Brit)	0.5
Pints (Brit)	Scruples (Brit, flu)	480
Pints (Brit)	Pints (US, dry)	0.0156
Pints (Brit)	Cu cm	550.61
Pints (Brit)	Cu inches	33.6003
Pints (Brit)	Gallons (US, dry)	0.125
Pints (Brit)	Liters	0.5506
Pints (Brit)	Pecks (US)	0.625
Pints (Brit)	Pints (US, liq)	1.1636
Pints (Brit)	Quarts (US, dry)	0.5
Pints (US, liq)	Cu cm	473.176
Pints (US, liq)	Cu feet	0.01671
Pints (US, liq)	Cu inches	28.875
Pints (US, liq)	Cu yards	0.000619
Pints (US, liq)	Cups	2
Pints (US, liq)	Drams (US, flu)	128
Pints (US, liq)	Fifths	0.625
Pints (US, liq)	Gallons (US, liq)	0.125
Pints (US, liq)	Gills (US)	4
Pints (US, liq)	Jiggers	24
Pints (US, liq)	Liters	0.47316
Pints (US, liq)	Milliliters	473.163
Pints (US, liq)	Minims (US)	7680
Pints (US, liq)	Ounces (US, flu)	16
Pints (US, liq)	Pints (Brit)	0.8327
Pints (US, liq)	Pints (US, dry)	0.85937
Pints (US, liq)	Ponys	48
Pints (US, liq)	Quarts (US, liq)	0.5
Pints (US, liq)	Shots	16
Pints (US, liq)	Teaspoons	96
Pints (US, liq)	Tablespoons	32
Pipe (English, wine)	Gallons	105
Pipe (English, wine)	Liters	477.34
Points (printing)	Centimeters	0.0351
Poise-cu cm/gram	Sq cm/sec	1
Poise-cu ft/lb	Sq cm/sec	62.428
Poise-cu in/gram	Sq cm/sec	16.3871
Ponys	Fifths	0.013
Ponys	Jiggers	0.5
Ponys	Ounces (US, fluid)	0.75
Ponys	Pints	0.0208
Ponys	Shots	0.75
Pottles (Brit)	Gallons (Brit)	0.5
Pottles (Brit)	Liters	2.273
Poud (Russia)	Pounds	36.113
Pounce (France)	Millimeters	27.07
Poundals	Dynes	13825
Poundals	Grams	14.098
Poundals	Joules/meter (newtons)	0.1383
Poundals	Kilograms	0.0141
Poundals	Pounds (avdp)	0.03108
Pounds (apoth or troy)	Drams (apoth or troy)	96
Pounds (apoth or troy)	Drams (avdp)	210.65
Pounds (apoth or troy)	Grains	5760
Pounds (apoth or troy)	Grams	373.24
Pounds (apoth or troy)	Kilograms	0.37324
Pounds (apoth or troy)	Ounces (apoth or troy)	12
Pounds (apoth or troy)	Ounces (avdp)	13.166
Pounds (apoth or troy)	Pennyweights	240
Pounds (apoth or troy)	Pounds (avdp)	0.82286
Pounds (apoth or troy)	Scruples (apoth)	288
Pounds (apoth or troy)	Tons (long)	0.000367
Pounds (apoth or troy)	Tons (metric)	0.00373
Pounds (apoth or troy)	Tons (short)	0.0004114
Pounds (avdp)	Drams (apoth or troy)	116.667
Pounds (avdp)	Drams (avdp)	256
Pounds (avdp)	Grains	7000
Pounds (avdp)	Grams	453.59
Pounds (avdp)	Hundredweights (long)	0.008929
Pounds (avdp)	Hundredweights (shrt)	0.01
Pounds (avdp)	Joules/cm	0.04448
Pounds (avdp)	Joules/meter	4.448
Pounds (avdp)	Kilograms	0.4536
Pounds (avdp)	Ounces (apoth or troy)	14.583
Pounds (avdp)	Ounces (avdp)	16
Pounds (avdp)	Pennyweights	291.667
Pounds (avdp)	Poundals	32.174
Pounds (avdp)	Pounds (apoth or troy)	1.21528
Pounds (avdp)	Scruples (apoth)	350
Pounds (avdp)	Slugs	0.03108
Pounds (avdp)	Tons (long)	0.0004464
Pounds (avdp)	Tons (metric)	0.0004536
Pounds (avdp)	Tons (short)	0.0005
Pounds/cu foot	Grams/cu cm	0.016018
Pounds/cu foot	Kg/cu meter	16.018
Pounds/cu foot	Lbs/cu yard	27
Pounds/cu inch	Grams/cu cm	27.6799
Pounds/cu inch	Grams/liter	27.6807
Pounds/cu inch	Kg/cu meter	27679.9
Pounds/cu inch	Lbs/cu foot	1728
Pounds/cu yard	Lbs/cu foot	0.037
Pounds/foot	Kilograms/meter	1.488
Pounds/gal (Brit)	Pounds/cu ft	6.2288
Pounds/gal (US, liq)	Grams/cu cm	0.11983
Pounds/gal (US, liq)	Pounds/cu ft	7.48052
Pounds/inch	Grams/cm	178.5797
Pounds/inch	Grams/ft	5443.11
Pounds/inch	Grams/inch	453.592
Pounds/inch	Ounces/cm	6.2992
Pounds/inch	Ounces/inch	16
Pounds/inch	Pounds/meter	39.37008
Pounds/minute	Kilograms/hr	27.2155
Pounds/minute	Kilograms/min	0.45359
Pounds/sq ft	Atmospheres	0.00047
Pounds/sq ft	Bars	0.000479
Pounds/sq ft	Cm of Hg @ 0 C	0.000479
Pounds/sq ft	Dynes/sq cm	478.803
Pounds/sq ft	Feet of water	0.01602
Pounds/sq ft	Grams/sq cm	0.48824
Pounds/sq ft	In of Hg @ 32 F	0.48824
0.014139	In of Hg @ 32 F	0.48824
Pounds/sq ft	In of H2O @ 39.2 F	0.48824
Pounds/sq ft	Kg/sq meter	4.88243
Pounds/sq ft	Lbs/sq inch	0.00694
Pounds/sq ft	Mm of Hg @ 0 C	0.00694
Pounds/sq in	Atmospheres	0.06805
Pounds/sq in	Bars	0.06895
Pounds/sq in	Cm of Hg @ 0 C	0.06895
Pounds/sq in	Cm of H2O @ 4 C	0.06895
Pounds/sq in	Dynes/sq cm	68947
Pounds/sq in	Feet of water	2.307
Pounds/sq in	Grams/sq cm	70.307
Pounds/sq in	In of Hg @ 32 F	70.307
Pounds/sq in	In of H2O @	70.307
Pounds/sq in	Kg/sq cm	0.07031
Pounds/sq in	Lbs/sq foot	144
Pounds/sq in	Mm of Hg @ 0 C	144
Pounds of water	Cu feet	0.01602
Pounds of water	Cu inches	27.68
Pounds of water	Gallons	0.1198
Pound-feet	Cm-grams	13825
Pound-feet	Meter-kilograms	0.1383
Prospecting dish	Gallons	2
Prospecting dish	Cu Yards	008929
Pu (China)	Inches	70.5
Puncheons (Brit)	Cu meters	0.31797
Puncheons (Brit)	Gallons (Brit)	69.9447
Puncheons (Brit)	Gallons (US)	84