Basic Units of Measurement and Conversions - Basic Mathematics for Water and Wastewater Operators - page 60

TABLE 2.7 (continued)
Conversion Factors by Unit Category

Factor Metric (SI) or English Conversions

Units of Mass

1 g (gram) 0.001 kg (kilogram)

1000 mg (milligrams)
1,000,000 mg = 10 6 ng (nanograms)
2.205 × 10 -3 lb (pounds)
15.43 gr (grains)
8.99 × 10 13 J (joules)

1 kg (kilogram) 1000 g (grams)

2.205 lb (pounds)

1 lb (pound) 453.59 g (grams)

0.45359 kg (kilogram)
16 oz. (ounces)

Units of Time

1 day 24 hr (hours)

1440 min (minutes)
86,400 sec (seconds)
0.143 wk (week)
2.738 × 10 -3 yr (year)

1 hr (hour) 0.0417 day

60 min (minutes)
3600 sec (seconds)
5.95 × 10 -3 wk (week)
1.14 × 10 -4 yr (year)

1 min (minute)

6.94 × 10 -4 day
0.0167 hr (hour)
60 sec (seconds)
9.92 × 10 -5 wk (week)
1.90 × 10 -6 yr (year)

1 wk (week) 7 days

168 hr (hours)
10,080 min (minutes)
6.048 × 10 5 sec (seconds)
0.0192 yr (year)

1 yr (year) 365.25 days

8766 hr (hours)
5.26 × 10 5 min (minutes)
3.16 × 10 7 sec (seconds)
52.18 wk (weeks)