Prefixes • Base SI Units • Derived Units • Conversion Factors
| PREFIXES | ||||||||||||
| z | a | f | p | n | μ | m | c | d | ||||
| zepto | atto | fempto | pico | nano | micro | milli | centi | deci | ||||
| 10-21 | 10-18 | 10-15 | 10-12 | 10-9 | 10-6 | 10-3 | 10-2 | 10-1 | ||||
| da | h | k | M | G | T | P | E | |||||
| deca | hecto | kilo | mega | giga | tera | peta | exa | |||||
| 101 | 102 | 103 | 106 | 109 | 1012 | 1015 | 1018 | |||||
| BASE SI UNITS | ||
| QUANTITY | SI UNIT | SYMBOL |
| Amount | mole | mol |
| Current | ampere | A |
| Length | metre | m |
| Luminousity | candela | cd |
| Mass | kilogram | kg |
| Temperature | kelvin | K |
| Time | second | s |
| DERIVED UNITS | |||
| UNIT | SYMBOL | QUANTITY | FORMULA |
| Bar | bar | Pressure | 0.1 MPa |
| Becquerel | Bq | activity (of radionuclides) | s-1 |
| Coulomb | C | electric charge | A s |
| Farad | F | capacitance | C V-1 |
| Gray | Gy | absorbed dose | J kg-1 |
| Hectare | ha | Area | hm2 |
| Henry | H | inductance | Wb A-1 |
| Hertz | Hz | frequency (periodic) | s-1 |
| Joule | J | energy; work; heat (quantity) | N m |
| Litre | l | volume | dm3 |
| Newton | N | force | kg m s-2 |
| Ohm | Ω | resistance (electric) | V A-1 |
| Pascal | Pa | pressure; stress | N m-2 |
| Stokes | St | viscosity (kinematic) | mm2 s-1 |
| Siemens | S | conductance | A V-1 |
| Tesla | T | magnetic flux density | Wb m-2 |
| Volt | V | potential difference; emf | W A-1 |
| Watt | W | power | J s-1 |
| Weber | Wb | magnetic flux | V s |
| CONVERSION FACTORS | ||
| QUANTITY | STANDARD UNIT | EQUIVALENT TO |
| Acceleration (Linear) | m s-2 | 2.237 mile hr-1 s-1
3.281 ft s-2 100 galileo |
| Acceleration (Rotational) | rad s-2 | 0.1592 rev s-2 |
| Activity (of radionuclides) | Bq | 2.703 x 10-11 curie |
| Amount (of substance) | mol | 0.02241 std m3 (0oC, 1 atm) |
| Angle | rad | 1/2p circle
0.1592 rev 0.637 quad 57.3 deg 63.66 gon; grade 3.438 x 103 min 2.063 x 105 s |
| Area | m2 | 1.073 x 10-8 township
3.861 x 10-7 section 1 x 10-4 ha 2.471 x 10-4 acre 1.550 x 103 in2 |
| Capacitance | F | 8.988 x 1011 statfarad |
| Conductivity (thermal) | W m-1 K-1 | 2.388 x 10-3 cal cm-1 s-1 K-1
0.5777 Btu ft-1 h-1 oR-1 |
| Current | A | 2.998 x 109 statampere |
| Density | kg m-3 | 1.940 x 10-3 slug ft-3
0.06243 lb ft-3 |
| Electric Charge | C | 2.998 x 109 statcoulomb |
| Energy | J | 9.478 x 10-9 therm
3.724 x 10-7 hp h 3.777 x 10-7 kW hr 5.266 x 10-4 Chu 9.478 x 10-4 Btu 9.869 x 10-3 l atm 0.2388 cal 1 x 107 erg 6.242 x 1018 eV |
| Energy (surface) | J m2 | 1 x 103 erg cm2 |
| Flow (volumetric) | m3 s-1 | 2.119 x 103 ft3 min-1
1.320 x 104 gal(UK) min-1 1.585 x 104 gal(US) min-1 |
| Flux (Magnetic) | Wb | 7.958 x 106 unit pole
1 x 108 maxwell |
| Flux (Thermal) | W m-2 | 2.390 x 10-5 cal s-1 cm-2
6.210 x 10-3 lambert 0.3173 Btu h-1 ft-2 |
| Force | N | 2.248 x 10-4 kip
7.231 pdl 1 x 105 dyne |
| Frequency (rotational) | rad s-1 | 9.549 rpm |
| Heat Transfer Coefficient | W m-2 K-1 | 2.390 x 10-5 cal s-1 cm-2 oC-1
4.892 x 10-5 Btu s-1 ft-2 oF-1 |
| Inductance | H | 1.113 x 10-12 stathenry |
| Length | m | 3.243 x 10-17 parsec
1.057 x 10-16 light-year 6.685 x 10-12 astronomical unit 1.799 x 10-4 league (UK) 2.071 x 10-4 league (Statute) 5.400 x 10-4 nautical mile 6.214 x 10-4 mile 4.557 x 10-3 cable 9.113 x 10-3 skein 0.04971 chain 0.1988 perch; pole; rod 0.5468 fathom 1.094 yd 1.312 pace 2.187 cubit 3.281 ft 4.374 span 4.971 link 9.843 hand 39.37 in 221.2 cicero 237.1 pica 472.4 line 2.845 x 103 (didot) point 3.937 x 103 caliber 1 x 1010 Å |
| Magnetic Flux Density | T | 1 x 104 G
1 x 109 gamma |
| Mass | kg | 9.843 x 10-4 ton (UK)
1.102 x 10-3 ton (US) 0.01968 cwt (UK) 0.02205 cwt (US) 0.06852 slug 2.205 lb 32.15 oz (troy) 35.27 oz (av) 257.2 dram (troy) 564.4 dram (av) 643.0 pennyweight 771.6 scruple 5 x 103 carat 1.543 x 104 grain |
| Potential Difference | V | 3.357 x 10-3 statvolt |
| Power | W | 2.843 x 10-4 ton of refrigeration
1.360 x 10-3 ch 1.360 x 10-3 hp (metric) 0.7376 ft lb s-1 0.8598 kcal hr-1 3.412 Btu hr-1 |
| Pressure | Pa | 9.869 x 10-6 atm
1 x 10-5 bar 3.345 x 10-5 mm H2O @ 0oC 1.450 x 10-4 psi 7.5 x 10-3 mm Hg @ 0oC 7.5 x 10-3 torr |
| Resistance | Ω | 1.113 x 10-12 statohm |
| Surface Tension | N m-1 | 1 x 103 dyne cm-1 |
| Temperature | K | 273 + oC
273 + (oF - 32) / 1.8 273 + (oR - 491) / 1.8 |
| Time | s | 1.653 x 10-6 week
1.157 x 10-5 day 2.778 x 10-4 hr 0.01667 min 1 x 108 shake |
| Velocity (Linear) | m s-1 | 3.021 x 10-3 mach
1.946 knot 2.237 mph 3.281 ft s-1 |
| Velocity (Rotational) | rad s-1 | 9.551 rev min-1
57.3 deg s-1 |
| Viscosity | cP | 6.720 x 10-4 lb ft-1 s-1
1 x 10-3 Pa s |
| Viscosity (Kinematic) | cSt | 1 x 10-6 m2 s-1
1.560 x 10-3 in2 s-1 |
| Volume | m3 | 0.2759 cord
1 stere 4.193 hogshead (US) 6.290 barrel (Oil) 28.38 bushel (US) 35.31 ft3 113.5 peck (US) 220 gal (UK) 264.2 gal (US) 1 x 103 l 1.057 x 103 quart 1.760 x 103 pint (UK) 2.113 x 103 pint (US) 4.227 x 103 cup 7.039 x 103 gill (UK) 8.454 x 103 gill (US) 3.520 x 104 fl oz (UK) 6.763 x 104 tbsp 2.029 x 105 tsp 1.200 x 107 drop |