The milligram, a unit of mass equal to one-thousandth of a gram, is pivotal in fields like pharmacology and chemistry, where precise measurement is essential. Although nearly imperceptible to the human eye, milligrams underpin the dosage of various medications, ensuring both safety and efficacy. A typical aspirin tablet, for example, generally contains 325 milligrams, showcasing how these small units add up to make a noticeable impact on our health.
Interestingly, the milligram plays a significant role in nutrition as well. The recommended daily intake of certain vitamins and minerals is often measured in milligrams. Vitamin C, vital for a healthy immune system, is recommended at about 65 to 90 milligrams per day for adults, highlighting the milligram’s crucial influence on maintaining our well-being.
The kilogram, the base unit of mass in the International System of Units (SI), has a fascinating history tied to a physical artifact. Until 2019, it was defined by Le Grand K, a platinum-iridium cylinder stored in a vault in France. However, even slight surface contamination or material wear could alter its mass. To ensure a more stable and universally consistent measure, the kilogram is now defined by the Planck constant—a fundamental constant of nature—using a Kibble balance. This revolutionary change marked a significant milestone in metrology and brings mass measurement into line with other SI units that are already defined by fundamental constants, rather than physical objects.
| Milligrams | Kilograms |
|---|---|
0
mg
|
0
kg
|
10
mg
|
0.00001
kg
|
20
mg
|
0.00002
kg
|
30
mg
|
0.00003
kg
|
40
mg
|
0.00004
kg
|
50
mg
|
0.00005
kg
|
60
mg
|
0.00006
kg
|
70
mg
|
0.00007
kg
|
80
mg
|
0.00008
kg
|
90
mg
|
0.00009
kg
|
100
mg
|
0.0001
kg
|
110
mg
|
0.00011
kg
|
120
mg
|
0.00012
kg
|
130
mg
|
0.00013
kg
|
140
mg
|
0.00014
kg
|
150
mg
|
0.00015
kg
|
160
mg
|
0.00016
kg
|
170
mg
|
0.00017
kg
|
180
mg
|
0.00018
kg
|
190
mg
|
0.00019
kg
|
200
mg
|
0.0002
kg
|
210
mg
|
0.00021
kg
|
220
mg
|
0.00022
kg
|
230
mg
|
0.00023
kg
|
240
mg
|
0.00024
kg
|
250
mg
|
0.00025
kg
|
260
mg
|
0.00026
kg
|
270
mg
|
0.00027
kg
|
280
mg
|
0.00028
kg
|
290
mg
|
0.00029
kg
|
300
mg
|
0.0003
kg
|
310
mg
|
0.00031
kg
|
320
mg
|
0.00032
kg
|
330
mg
|
0.00033
kg
|
340
mg
|
0.00034
kg
|
350
mg
|
0.00035
kg
|
360
mg
|
0.00036
kg
|
370
mg
|
0.00037
kg
|
380
mg
|
0.00038
kg
|
390
mg
|
0.00039
kg
|
400
mg
|
0.0004
kg
|
410
mg
|
0.00041
kg
|
420
mg
|
0.00042
kg
|
430
mg
|
0.00043
kg
|
440
mg
|
0.00044
kg
|
450
mg
|
0.00045
kg
|
460
mg
|
0.00046
kg
|
470
mg
|
0.00047
kg
|
480
mg
|
0.00048
kg
|
490
mg
|
0.00049
kg
|
500
mg
|
0.0005
kg
|
510
mg
|
0.00051
kg
|
520
mg
|
0.00052
kg
|
530
mg
|
0.00053
kg
|
540
mg
|
0.00054
kg
|
550
mg
|
0.00055
kg
|
560
mg
|
0.00056
kg
|
570
mg
|
0.00057
kg
|
580
mg
|
0.00058
kg
|
590
mg
|
0.00059
kg
|
600
mg
|
0.0006
kg
|
610
mg
|
0.00061
kg
|
620
mg
|
0.00062
kg
|
630
mg
|
0.00063
kg
|
640
mg
|
0.00064
kg
|
650
mg
|
0.00065
kg
|
660
mg
|
0.00066
kg
|
670
mg
|
0.00067
kg
|
680
mg
|
0.00068
kg
|
690
mg
|
0.00069
kg
|
700
mg
|
0.0007
kg
|
710
mg
|
0.00071
kg
|
720
mg
|
0.00072
kg
|
730
mg
|
0.00073
kg
|
740
mg
|
0.00074
kg
|
750
mg
|
0.00075
kg
|
760
mg
|
0.00076
kg
|
770
mg
|
0.00077
kg
|
780
mg
|
0.00078
kg
|
790
mg
|
0.00079
kg
|
800
mg
|
0.0008
kg
|
810
mg
|
0.00081
kg
|
820
mg
|
0.00082
kg
|
830
mg
|
0.00083
kg
|
840
mg
|
0.00084
kg
|
850
mg
|
0.00085
kg
|
860
mg
|
0.00086
kg
|
870
mg
|
0.00087
kg
|
880
mg
|
0.00088
kg
|
890
mg
|
0.00089
kg
|
900
mg
|
0.0009
kg
|
910
mg
|
0.00091
kg
|
920
mg
|
0.00092
kg
|
930
mg
|
0.00093
kg
|
940
mg
|
0.00094
kg
|
950
mg
|
0.00095
kg
|
960
mg
|
0.00096
kg
|
970
mg
|
0.00097
kg
|
980
mg
|
0.00098
kg
|
990
mg
|
0.00099
kg
|
1000
mg
|
0.001
kg
|
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