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Daily LifeMetric/English Conversions Table

By Brad Smith

There are lots of websites available to do Metric/English conversions, but here are some quickie conversions and techniques to help.

TEMPERATURE:   Given a temperature in Celsius, you can easily estimate the temperature in Farenheit by multiplying by 2 and adding 30. For example, if the temperature is 21°C, that means it's roughly 21*2+30 = 72°F. The real temperature is 70°F so the estimation is off by only 2°. Certainly close enough for government work. And, of course, converting from Farenheit to Celsius is the opposite: subtract 30, then divide by 2. For example, 75°F is approximately (75-30)/2 = 23°C. The real temperature is 24 °F, so this approximation is quite close.

MILEAGE:   Fuel efficiency in continental Europe is measured in liters consumed per 100 km, which is the inverse of the U.S. standard miles per gallon. To convert from liters/100 km to miles/gal, divide 235 by the value. The same equation can be used to calculate miles/gal to liters/100 km as well. For example, if your European car gets 6.2 liters/100 km, that's 235/6.2 = 38 mpg. Another example: 22 mpg = 235/22 = 10.7 liters/100 km.


1 mi = 1.61 km 1 gal = 3.79 l 1 oz = 2.96 cl °F = (9/5) °C + 32 mpg = 235.2 / [l/100km]
1 km = 0.62 mi 1 l = 0.26 gal 1 cl = 0.34 oz °C = (°F - 32) * (5/9) [l/100km] = 235.2 / mpg
1 in = 2.54 cm 1 oz = 29.55 ml
1 cm = 0.39 in 1 ml = 0.034 oz
Distance / Speed Volume Volume Temperature Fuel Efficiency
miles km   km miles gal liters   liters gal oz cl   cl oz F C   C F mpg l/100km   l/100km mpg
1 1.6 1 0.6 1 3.8 1 0.26 1 3.0 1 0.34 0 -18 -20 -4 16 14.7 5.0 46.9
2 3.2 2 1.2 2 7.6 2 0.53 2 5.9 2 0.68 5 -15 -15 5 18 13.0 5.5 42.7
3 4.8 3 1.9 3 11.4 3 0.79 3 8.9 3 1.02 10 -12 -10 14 20 11.7 6.0 39.1
4 6.4 4 2.5 4 15.1 4 1.06 4 11.8 4 1.35 15 -9 -5 23 22 10.7 6.5 36.1
5 8.0 5 3.1 5 18.9 5 1.32 5 14.8 5 1.69 20 -7 0 32 24 9.8 7.0 33.5
6 9.7 6 3.7 6 22.7 6 1.59 6 17.7 6 2.03 25 -4 5 41 26 9.0 7.5 31.3
7 11.3 7 4.3 7 26.5 7 1.85 7 20.7 7 2.37 30 -1 10 50 28 8.4 8.0 29.3
8 12.9 8 5.0 8 30.3 8 2.11 8 23.6 8 2.71 35 2 15 59 30 7.8 8.5 27.6
9 14.5 9 5.6 9 34.1 9 2.38 9 26.6 9 3.05 40 4 20 68 32 7.3 9.0 26.1
10 16.1 10 6.2 10 37.9 10 2.64 10 29.6 10 3.38 45 7 25 77 34 6.9 9.5 24.7
15 24.1 15 9.3 15 56.8 15 3.96 15 44.3 15 5.08 50 10 30 86 36 6.5 10.0 23.5
20 32.2 20 12.4 20 75.7 20 5.28 20 59.1 20 6.77 55 13 35 95 38 6.2 10.5 22.4
25 40.2 25 15.5 25 94.6 25 6.61 25 73.9 25 8.46 60 16 40 104 40 5.9 11.0 21.3
50 80.5 50 31.0 50 189.3 50 13.21 50 147.8 50 16.92 65 18 45 113 42 5.6 11.5 20.4
60 96.5 60 37.2 60 227.1 60 15.85 60 177.3 60 20.30 70 21 12.0 19.6
70 112.6 70 43.4 70 265.0 70 18.49 70 206.9 70 23.69 75 24 12.5 18.8
80 128.7 80 49.6 80 302.8 80 21.14 80 236.4 80 27.07 80 27
90 144.8 90 55.8 90 340.7 90 23.78 90 266.0 90 30.46 85 29
100 160.9 100 62.0 100 378.5 100 26.42 100 295.5 100 33.84 90 32
110 177.0 110 68.2 110 416.4 110 29.06 110 325.1 110 37.23 95 35
120 193.1 120 74.4 120 454.2 120 31.70 120 354.6 120 40.61 100 38
130 209.2 130 80.6 130 492.1 130 34.35 130 384.2 130 43.99 105 41
140 225.3 140 86.8 140 529.9 140 36.99 140 413.7 140 47.38 110 43
150 241.4 150 93.0 150 567.8 150 39.63 150 443.3 150 50.76 115 46


TEMPERATURE:   The estimated Farenheit temperature is fairly accurate for the region of interest, 0-30°C, but gets more inaccurate at higher temperatures because the slopes are slightly different (9/5=1.8 for reality vs. 2 in our estimation). The temperature at which it is correct is 50 °F / 30 °C. For hot days, you can add 28 instead of 30 to get closer to reality.

Related Link:
Metric Conversion System + Table / Chart Conversions + Converter

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