Ounces And Pounds Vs. Grams - The Engineering ToolBox

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• Mass is a measure of the amount of material in an object with kg in the SI-system and slugs in the Imperial system
• Weight is the gravitational force acting on a body mass - Newton in the SI-system and pounds in the Imperial system

Note - it is not possible to convert pounds (or ounces) to kg (or grams) without including the force of gravity.

It is a common misconception to convert weight in pounds (ounces) to kg (grams) as mass as a measure of weight as indicated below.

Ounces and Pounds vs. Grams

Imperial Units (weight)	SI-units (mass)
Ounces	grams
1/4 (quarter)	7
1/2 (half)	14
3/4 (three quarters)	21
1	28.35
2	57
3	85
4 (quarter lb)	113
5	142
6	170
7	198
8 (half lb)	227
9	255 (1/4 kilo)
10	284
11	312
12 (3/4 lb)	340
13	369
14	397
15	425
16 (1 lb)	454
17	482
18	510 (1/2 kilo)
19	539
20 (1 1/4 lbs)	567
21	595
22	624
23	652
24 (1 1/2 lbs)	680
25	709
26	737
27	765 (3/4 kilo)
28 (1 3/4 lbs)	794
29	822
30	851
31	879
32 (2 lbs)	907

Mass in kg must be multiplied with acceleration of gravity (9.807 m/s2) to be comparable with weight in pounds.

• Mass and Weight - the Difference

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