©1996-1999 William James
units & conversions |
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| Preferred units: length, m; mass kg; time, s; temperature, C; force, N; energy or work, J; power, W; pressure or stress, Pa |
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| Preferred prefixes: giga, G; mega, M; kilo k; milli, m; micro, mu; |
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| Weight/mass units: mass density is mass per unit volume, rho = [kg.m-3]; weight density or specific weight is force per unit volume, gamma = rho.g = [N.m-3] relative density or specific gravity is the ratio of the substance density to density of water |
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| Derivations: K= 273 + C; N = kg.m.s-2; J = N.m; W = J/s; Pa = N.m-2; |
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| Handy numbers: 1 m3 = 1000 l; 1 m water = 10 kPa; 2.3 ft water = 1 psi; 1 ft3 water= 62.4 lbs; 1 m3 water = 1000 kg common distribution pressures: 150 ft = 45 m = 450 kPa = 65 psi; |
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| For an excellent applet for converting any unit to
(consistent) any other click
here. For another similar, longer table of conversion from any unit to (consistent) click here. |
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| USE THE FOLLOWING TABLE FOR CONVERTING SI UNITS TO U.S. CUSTOMARY UNITS | ||
| To convert from (SI) | Conversion factor | To get U.S. Customary |
| Length | ||
| Meters (m) | Multiply by 3.28 | Feet (ft) |
| Meters | Multiply by 1.094 | Yards |
| Meters per second (m/s) | Multiply by 2.237 | Miles per hour (mph) |
| Centimeters (cm) | Multiply by 0.39 | Inches (in.) |
| Milimeters (mm) | Divide by 25.4 | Inches |
| Kilometers (km) | Divide by 1.608 | Miles (mi) |
| m3/(m2-day) = m/day | Multiply by 24.6 | gpd/ft2 |
| Area | ||
| cm2 | Divide by 6.45 | Square inch |
| m2 | Multiply by 10.76 | Square foot (ft2) |
| Hectare (ha = 10 000 m2) | Multiply by 2.46 | Acre |
| km2 ( = 100 ha = 106 m2) | Multiply by 0.387 | Square mile |
| Volume | ||
| Liters ( = 1 dm3) | Divide by 28.3 | Cubic foot (ft3) |
| m3 | Multiply by 35.4 | ft3 |
| Liters | Divide by 3.78 | U.S. gal |
| Liters | Divide by 4.54 | Imp. gal |
| Liters/(s-ha) | Multiply by 0.014 | Inches/hour |
| m3 | Divide by 3 780 | Million U.S. gal (mg) |
| m3 | Multiply by 8.54 | Barrel |
| m3 | Divide by 1 230 | Acre-ft |
| Liters/s | Divide by 43.75 | Million gal/day (mgd) |
| Liters/s | Multiply by 15.87 | gal/min (gpm) |
| Liters/m2 | Divide by 40.76 | gal/ft2 |
| Mass | ||
| Gram (g) | Divide by 454 | Pounds (lb) |
| Gram | Multiply by 15.43 | Grain |
| Kilogram (kg = 1 000 g) | Multiply by 2.2 | Pounds |
| Newton ( = 0.1 kgb) | Multiply by 0.225 | Pounds |
| Metric ton ( = 1 000 kg) | Multiply by 1.1 | U.S. ton |
| Metric ton | Multiply by 0.98 | English ton |
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Questions
or comments? ©1996-1999 William James |
Last modified 97/02/03
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