Units Calculator Tool Guide

#### What this tool does

This tool converts one unit to another within a unit category. For example, feet (a unit in the unit category of length) can be converted to meters (a different unit within the same unit category).

#### Included unit categories and corresponding units

Area – acre; cm2; ft2; hectare; in2; km2; m2; mile2; mm2; yd2

Calculator – Unitless – This is a “special” units category for the specific purpose of performing calculations with the RED Math on-the-fly feature. When you select this units category, notice that the dropdown units selections disappear. Use this selection to perform Math on-the-fly calculations using this notation: “+” (addition); “-” (subtraction);”*” (multiplication); “/” (division); “^” (exponent); and “( )” parenthesis. Note that blank spaces are ignored by Math on-the-fly. For example:

• 4+5 = 9
• 4-5 = -1
• 4*5 = 20
• 4 * 5 = 20
• 4 / 5 = 0.8
• 4^2 = 16
• 4^3 = 64
• ((400*2)+(600*2))/4 = 500.

Density – g/L (grams per liter); g/m3 (grams per cubic meter); kg/L; kg/m3; lb/ft3 (pounds per cubic foot); lb/yd3 (pounds per cubic yard); oz/ft3 (ounces per cubic foot); oz/yd3

Energy – Btu (British thermal units); Cal (calories); GJ (gigajoules); J (joules); kCal (kilocalories); kJ (kilojoules); kWh (kiloWatt hours); MBtu (thousand Btu); MJ (megajoules); MMBtu (million Btu); MWh (megawatt hours); therm

Flow – CFM (cubic feet per minute); gpm (gallons per minute); L/s (liters per second); m3/hr (cubic meters per hour); m3/min (cubic meters per minute); m3/s (cubic meters per second)

Force – lb (pounds); N (newtons); oz (ounces); pdl (poundals)

Length – chain; cm; ft; furlong; hand; in; km; light yr; link; m; mile; mm; naut mile (nautical miles); parsec; rod; yd

Mass – carat; g (grams); grain; kg (kilograms); lb (pounds); mg (milligrams); slug

Power – GW (gigawatt); hp (horse power); kW (kilowatt); mW (thousand watts); MW (megawatt); W (watt)

Pressure – atm (atmospheres); bar; hPa (hectopascals); inHg (inches of mercury); iwc (inches of water column); kPa (kilopascals); mbar (millibars); mmHg (millimeters mercury); mmwc (millimeters water column); Pa (pascals); psi (pounds per square inch)

R-valueoF·ft2·h/Btu (degrees Fahrenheit, square feet, hour per British thermal units); K·m2/W (kelin, square meters per watt)

R-value per thicknessoF·ft2·h/(Btu·in) (degrees Fahrenheit, square feet, hour per British thermal unit, inch); K·m2/(W·cm) (kelvin, square meter per watt, centimeter)

Speed – ft/min; ft/s (feet per second); knot; kph (kilometers per hour); m/min (meters per minute); m/s (meters per second); mph (miles per hour)

Temperature Difference – [For example, the temperature difference between inside and outside] oC (degrees Celsius); oF (degrees Fahrenheit)

Temperature Measurement – [A temperature measured with a thermometer] oC (degrees Celsius); oF (degrees Fahrenheit); K (kelvin); R (rankine)

Time – day; hr; min; s; yr

1/Time – [For example, the expression ach has units of 1/hr] 1/day; 1/hr; 1/min; 1/s; 1/yr

UA – Btu/(oF·h) (British thermal units, degree Fahrenheit, hour); W/K (watts per kelvin)

U-value – Btu/(oF·ft2·h) (British thermal units per degree Fahrenheit, square foot, hour); W/(K·m2) (watts per kelvin, square meter)