Unit Conversion from Innovyze H20Calc

 

3.17 Unit Conversion

Both SI and English units are used throughout this users guide. Tables 13-14 through 13-19 list conversion factors for common units.

 

Table 13-14: Length Equivalents

Unit	Equivalent
	Millimeter	Inch	Foot	Meter	Kilometer	Mile
Millimeter	1	0.03937	0.003281	0.001	1´10-6	0.621´10-6
Inch	25.4	1	0.0833	0.0254	25.40´10-6	15.78´10-6
Foot	304.8	12	1	0.3048	304.8´10-6	189.4´10-6
Meter	1,000	39.37	3.281	1	0.0010	621.4´10-6
Kilometer	1´106	39,370	3,281	1,000	1	0.6214
Mile	1.609´106	63,360	5,280	1,609	1.609	1

Note: Multiply the amount of the given unit by the value shown to obtain the amount in equivalent units (e.g., 1.50 m x 39.37 inch/m = 59.1 inch)

 

Table 13-15: Area Equivalents

Unit	Equivalent
	Sq. inch	Sq. foot	Sq. meter	Acre	Hectare	Sq. mile
Sq. inch	1	0.006944	645´10-6	0.16´10-6	64.5´10-9	0.25´10-9
Sq. foot	144	1	0.0929	23´10-6	9.29´10-6	35.9´10-9
Sq. meter	1,550	10.76	1	2471´10-6	0.0001	0.39´10-6
Acre	6.27´106	43,560	4,047	1	0.4047	0.001563
Hectare	15.5´106	107,639	10,000	2.471	1	0.003861
Sq. mile	4.01´109	27.88´106	2.59´106	640	259.0	1

 

Table 3-16: Volume Equivalents

	Equivalent
Unit	Cu. inch	Liter	U.S. gallon	Cu. foot	Cu. meter	Acre-foot
Cu. inch	1	0.01639	0.004329	578.7´10-6	16.39´10-6	13.29´10-9
Liter	61.02	1	0.2642	0.03531	0.0010	810.6´10-9
U.S. gallon	231.0	3.785	1	0.1337	0.003785	3.068´10-6
Cu. foot	1,728	28.32	7.481	1	0.02832	22.96´10-6
Cu. meter	61,020	1,000	264.2	35.31	1	810.6´10-6
Acre-foot	75.27´106	1.233´106	325,900	43,560	1,233	1

 

Table 3-17: Discharge Equivalents

Unit	Equivalent
	Gallon/min	Liter/sec	Acre-ft/day	Cu. foot/sec	Million gal/day	Cu. meter/sec
Gallon/min	1	0.06309	0.004419	0.002228	0.001440	63.09´10-6
Liter/sec	15.85	1	0.07005	0.03531	0.02282	0.0010
Acre-ft/day	226.3	14.28	1	0.5042	0.3259	0.01428
Cu. foot/sec	448.8	28.32	1.983	1	0.6463	0.02832
Million gal/day	694.4	43.81	3.069	1.547	1	0.04381
Cu. meter/sec	15,850	1,000	70.04	35.31	22.82	1

 

Table 3-18: Miscellaneous Conversions

Dimension	SI unit	Multiplier	Equivalent U.S. customary unit
Velocity	Meter/sec	3.281	Feet/second
Mass	Kilogram	0.06852	Slugs
Force	Newton	0.2248	Pound force
Pressure	Pascal	145.0´10-6	Pound force/sq. inch
Pressure	Pascal	0.02089	Pound force/sq. foot
Power	Watt	0.001341	Horsepower
Power	Watt	0.7376	Foot-pound/second
Energy	Joule	0.7376	Foot - pound
Heat Density	Calorie/sq. cm. (i.e., Langley)	3.687	BTU/sq. foot

Note: To covert from U.S. customary units to S.I. units, use the inverse of the listed multiplier (e.g., 2.0 ft/s ´ (1/3.281) = 0.61 m/s)

 

                                      Table 3-19: Temperature Conversions

Original unit	Conversion formula	Equivalent unit
oF	5 ´ (oF – 32) / 9	oC
oC	32 + (9 ´ oC / 5)	oF
oC	oC + 273	oK
oF	5 ´ (oF + 460) / 9	oK
oR	5 ´ oR / 9	oK

                             Note: oC = degree Celsius; oF = degree Fahrenheit; oR = degree Rankine; and oK = degree Kelvin

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