National Metric Day – 2024

October 15, 2024May 1, 2025

The importance of recent National Metric Day for 2024 leads me to the showing of a conversion table and some resources for your viewing, with both metric and customary conversions. Enjoy!

🥳 Metric Conversion Chart

Unit of Measurement Chart Conversion Table Stock Vector - Illustration of information, mass-dreamstime_m_177245754.jpg

ID 177245754 @ Juliedeshaies | Dreamstime.com

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🤞 Synopsis:
Here is a metric conversion chart which also shows popular U.S. used customary (“English system”) conversions and some insight as to what mathematical formulas are needed in order to convert from old style customary over to metric and insight of some odd measurements.

Metric & English Conversion
Length (Distance)
Metric	Unit	Customary	Conversion
Kilometer	1	Mile (mi)	0.621371192237334 mile
—	—	Nautical Mile (NM)	1.1507794480235425 mi
—	—	Yard = 3 × Feet	—
Meter (m)	1	Foot (ft \| ‘)	3.2808398950131233
Centimeter (cm)	1	Inch (in \| “)	0.3937007874015748
Astronomic Distance
Distance	Unit	Measure	Customary Conversion
Light year	63241.07708426628	AU	—
Astronomical Unit	149,597,870.7	km	92,955,807.273 mi
Area
Metric	Unit	Customary	Conversion
Sq. Kilometer (km²)	1	Square Mile (sq mi)	0.38610215854244585
Sq. Kilometer (km²)	1	Acre (ac)	247.10538146716533
—	—	Acre (ac)	640 ac = 1 sq mi
Sq. Meter (m²)	1	Sq. Yard (sq yd)	1.195990046301080300672
—	—	Sq. Foot (sq ft)	9 sq ft = 1 sq yd
Mass (Weight)
Metric	Unit	Customary	Conversion
Tonne (t) 1000 kg	1 metric ton	Ton (T) 2000 lbs	1.1023113109243878
Kilogram (kg)	1	Pound (lb)	2.2046226218487755
Gram (g)	1	Ounces (oz) 1/16 lb	0.0352739619495804150
Milligram (mg)	1/1000 g	—	—
Time
Time was tried a conversion to metric but left remainders with every attempt. Current earth time is so precise, that it only has to have a leap second determined every so many years on a June 30th. As is, the leap year is every 4 years, except one skip every hundred years on the century marker. Then skip the skip every 400 year (last such skip was in 2000 AD) On March 1, 2000, the time was within 1 microsecond of where the calendar and clock were on March 1, 1600 & where it will be on March 1, 2400.
Unit	Conversion	—	—
microsecond (μs)	millionth of second	—	—
Temperature
Metric	Unit	Customary	Conversion
-273.15°C (Celsius)	Absolute Zero	-460.0°F	Fahrenheit (°F)
0°C (Celsius)	Freezing Point	32°F	Fahrenheit (°F)
100°C (Celsius)	Boiling Point	212°F	Fahrenheit (°F)
10-15 million°C	Fusion Point Sun	—	—
Speed
Metric	Unit	Customary	Conversion
Kilometers per hour	1 kph	Miles per hour	0.6213711922373837 mph
Kilometers per hour	16.09344 kph	Miles per hour	10 mph

national bureau of standards publication 304.jpg

National Bureau of Standards publication 304 courtesy of National Bureau of Standards – archives

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The conversion of the United States has been attempted several times in the past, with the most vigorous attempt in 1975. The United States uses the metric system a lot, but there really is no exact adoption, just a percentage. The metric system remains not completely adopted as of present. The metric system is estimated to be used worldwide by at or near 95% of the world at large.