You must have JavaScript enabled in your browser to utilize the functionality of this website. Save For Later Print. Today it is very important to be able to understand measurements in both the English system of units and the SI Systems International system of units. The SI system of units often referred to as the metric system is the official system for measurements in nearly all countries of the world, but not in the U.
As our society and economy become more global in scope, it is increasingly important to fully comprehend both the English and the SI systems of units and to accurately and conveniently convert from one system to another. World-wide communications, commerce, finance and many other functions depend upon everyone involved in the processes to be knowledgeable of both systems of measurements.
There have been some very costly failures associated with insufficient attention being given to the units of measurements involved in calculations and communications.
A methodical approach is needed to avoid errors encountered when converting from one system of units to another. Unit conversion multipliers are presented in this fact sheet along with several examples to describe the use of these multipliers. The conversion factors presented are for general measurements as well as those primarily associated with energy calculations; additional conversion multipliers can be found in the the references.
This fact sheet is intended to serve as a reference for converting many different types of measurements quickly and accurately from one system of units to another. The fact sheet is intended for use in the classroom as well as for extension outreach programs.
Table 1 presents the conversion multiplication factors to convert from English units to SI units and vice versa for basic measurements including length, weight, area, volume, bulk density, mass flow rate, volume flow rate, pressure and power. Additional conversion factors are presented for energy, energy density, and energy yields.
SI prefixes indicating orders of magnitude are provided in Table 2. Use of these prefixes avoids the need for powers of 10 notations. No single conversion factor can be used to convert temperatures in the English system degrees Fahrenheit or degrees Rankine to temperatures in the SI system degrees Celsius and degrees Kelvin or the other way around. The equations for converting temperatures and temperature difference from one system to another are presented in Table 3.
A field is acres and you want to express that area in hectares. Find the Area category in Table 1. Since the known unit is "Acres", find the numeral "1" under the acre column. Follow that line to the right to find the corresponding multiplication factor of 0. The area of the acre field in hectares is For another exercise involving area, calculate how many sq ft square feet are in a plot that is 0.
Find the numeral "1" under hectare column and read the multiplier of , on the same line to the left under sq ft column. Then calculate the number of square feet as 64, 0. Energy content of buckwheat is Locate the numeral "1" under that column and then read to the left to get the multiplication factor of An electric resistance heating system rated at 25 kW is to be replaced with a propane furnace.
Under the Power category in Table 1, locate the numeral "1" under the kW column. A utility company decides to promote distributed generation by building 1, ministations with each powered by a 1, hp diesel engine. What is the total capacity of the 1, stations? First, convert the 1, hp to kW using the factor of 0. The power that can be generated by 1, plants is 1,, kW 1, x To avoid use of trailing 0's or powers of 10, use the SI prefixes in Table 2.
The answer can be expressed as 1, MW or 1. The temperature on a very cold day in Moscow in February is C. Calculate the corresponding temperature in degrees F. Using Table 3, find the equation to change from degrees C to degrees F. So a temperature of C is On a winter day in State College, the outside air temperature is 20 F and the temperature inside a building is 70 F. So the temperature difference is 50 F. Calculate the temperature difference in degrees C. Your current browser may not support copying via this button.
Table 1. Basophils see White blood cell count. Laboratory reference values. N Engl J Med. SI Units for Clinical Measurement. Goldman-Cecil Medicine. Elsevier Saunders; ; 5 Longo D, et al. Harrison's Principles of Internal Medicine. Accessed August 1, McGraw-Hill Education; All rights reserved. Activated partial thromboplastin time APTT. Ascorbic acid see Vitamin C. Bands see White blood cell count.
Carbon dioxide, P co 2. Oxygen, P o 2. Cholecalciferol see Vitamin D. Proportion of total protein. Eosinophils see White blood cell count. Erythrocyte count see Red blood cell count. Mean corpuscular hemoglobin concentration MCHC. Hemoglobin A 1c glycated hemoglobin. Leukocytes see White blood cell count. Lymphocytes see White blood cell count.
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