| Imperial gallon per minute | gal(UK)/min | G3 | 2 | 312 | |
| impression | IM | 3.9 | Z | 1445 | |
| inch | in | INH | 2 | 27 | |
| inch cubed | in³ | INQ | 2 | 246 | |
| inch per minute | IL | 3.5 | Z | 1263 | |
| inch per second (linear speed) | in/s | IU | 2 | 103 | |
| 102 | |||||
| inch per second squared (acceleration) | in/s2 | IV | 2 | 110 | |
| 111 | |||||
| inch pound (pound inch) | in.lb | IA | 2 | 208 | |
| inch to the fourth power | in4 | D69 | 2 | 244 | |
| inches of water | IF | 3.1C | X | 1005 | |
| insurance policy | IP | 3.9 | Z | 1446 | |
| International Table (IT) calorie | calIT | D70 | 2 | X | 324 |
| International Table (IT) calorie per gram | calIT/g | D75 | 2 | X | 359 |
| International Table (IT) calorie per gram kelvin | calIT/(g.K) | D76 | 2 | X | 349 |
| International Table (IT) calorie per second centimetre kelvin | calIT/(s.cm.K) | D71 | 2 | X | 332 |
| International Table (IT) calorie per second square centimetre kelvin | calIT/(s.cm².K) | D72 | 2 | X | 335 |
| jar | JR | 3.3A | 1101 | ||
| joint | JO | 3.9 | Z | 1448 | |
| joule | J | JOU | 1 | 261 | |
| 321 | |||||
| 505 | |||||
| 515 | |||||
| 712 | |||||
| 736 | |||||
| 757 | |||||
| 829 | |||||
| 928 | |||||
| joule per cubic metre | J/m³ | B8 | 1 | 458 | |
| 516 | |||||
| 586 | |||||
| joule per gram | J/g | D95 | 1S | 355 | |
| joule per kelvin | J/K | JE | 1 | 344 | |
| 353 | |||||
| 676 | |||||
| joule per kilogram | J/kg | J2 | 1 | 354 | |
| joule per kilogram kelvin | J/(kg.K) | B11 | 1 | 346 | |
| joule per metre | J/m | B12 | 1 | 800 | |
| 840 | |||||
| joule per metre squared | J/m² | B13 | 1 | 520 | |
| joule per metre to the fourth power | J/m4 | B14 | 1 | 518 | |
| joule per mole | J/mol | B15 | 1 | 630 | |
| 632 | |||||
| 634 | |||||
| joule per mole kelvin | J/(mol.K) | B16 | 1 | 636 | |
| joule per square metre | J/m² | B13 | 1 | 774 | |
| joule second | J.s | B18 | 1 | 708 | |
| joule square metre | J.m² | D73 | 1 | 803 | |
| joule square metre per kilogram | J.m²/kg | B20 | 1 | 806 | |
| jug | JG | 3.3A | 1102 | ||
| jumbo | JB | 3.4B | Z | 1153 | |
| keg | KG | 3.3A | 1070 | ||
| kelvin | K | KEL | 1 | 314 | |
| 905 | |||||
| kelvin per watt | K/W | B21 | 1 | 340 | |
| kiloampere | kA | B22 | 1S | 365 | |
| kiloampere per square metre | kA/m² | B23 | 1S | 427 | |
| kiloampere per metre | kA/m | B24 | 1S | 429 | |
| kilobar | kbar | KBA | 1M | 220 | |
| kilobecquerel | kBy | 2Q | 1S | 747 | |
| kilobecquerel per kilogram | kBq/kg | B25 | 1S | 752 | |
| kilobyte | 2P | 3.6B | 1271 | ||
| kilocharacter | KB | 3.9 | Z | 1452 | |
| kilocoulomb | kC | B26 | 1S | 376 | |
| kilocoulomb per cubic metre | kC/m³ | B27 | 1S | 385 | |
| kilocoulomb per square metre | kC/m² | B28 | 1S | 394 | |
| kilocurie | kCi | 2R | 2S | 744 | |
| kiloelectronvolt | keV | B29 | 1S | 279 | |
| kilogauss | kGs | 78 | 3.5C | X | 1239 |
| kilogram | kg | KGM | 1 | 138 | |
| 667 | |||||
| 695 | |||||
| 701 | |||||
| 942 | |||||
| kilogram decimal | KD | 3.9 | Z | 1453 | |
| kilogram metre per second | kg.m/s | B31 | 1 | 187 | |
| kilogram metre squared | kg.m² | B32 | 1 | 189 | |
| kilogram metre squared per second | kg.m²/s | B33 | 1 | 188 | |
| kilogram named substance | KNS | 3.1A | Z | 953 | |
| kilogram of nitrogen | KNI | 3.1A | Z | 954 | |
| kilogram of phosphorus pentoxide (phosphoric anhydride) | KPP | 3.1A | Z | 955 | |
| kilogram of potassium hydroxide (caustic potash) | KPH | 3.1A | Z | 956 | |
| kilogram of potassium oxide | KPO | 3.1A | Z | 957 | |
| kilogram of sodium hydroxide (caustic soda) | KSH | 3.1A | Z | 958 | |
| kilogram of substance 90 % dry | KSD | 3.1A | Z | 959 | |
| kilogram of uranium | KUR | 3.1A | Z | 960 | |
| kilogram per air dry metric ton | 32 | 3.5 | Z | 1246 | |
| kilogram per cubic decimetre | kg/dm³ | B34 | 1S | 165 | |
| kilogram per cubic metre | kg/m³ | KMQ | 1 | 156 | |
| 576 | |||||
| 642 | |||||
| kilogram per kilogram of product | 3H | 3.9 | Z | 1519 | |
| kilogram per litre | kg/l or kg/L | B35 | 1S | 160 | |
| 1 | 643 | ||||
| 3.9 | Z | 1517 | |||
| kilogram per metre | kg/m | KL | 1 | 175 | |
| kilogram per millimetre width | KI | 3.1C | 992 | ||
| kilogram per mole | kg/mol | D74 | 1 | 624 | |
| kilogram per piece of product | 3I | 3.9 | Z | 1520 | |
| kilogram per second | kg/s | KGS | 1 | 296 | |
| kilogram per square centimeter | D5 | 2 | 235 | ||
| kilogram per square metre | kg/m² | 28 | 1M | 184 | |
| 1 | 809 | ||||
| kilogram-force | kgf | B37 | 2 | X | 197 |
| kilogram-force metre | kgf.m | B38 | 2 | X | 207 |
| 282 | |||||
| kilogram-force metre per second | kgf.m/s | B39 | 2 | X | 292 |
| kilogram-force per square metre | kgf/m² | B40 | 2 | X | 230 |
| kilograms per millimeter | kg/mm | KW | 1M | 177 | |
| kilohertz | kHz | KHZ | 1S | 115 | |
| kilojoule | kJ | KJO | 1S | 262 | |
| kilojoule per kelvin | kJ/K | B41 | 1S | 345 | |
| kilojoule per kilogram | kJ/kg | B42 | 1S | 357 | |
| kilojoule per kilogram kelvin | kJ/(kg.K) | B43 | 1S | 347 | |
| kilojoule per mole | kJ/mol | B44 | 1S | 631 | |
| kilolitre | kl | K6 | 1M | 58 | |
| kilolitre per hour | kl/h | 4X | 1M | 306 | |
| kilometre | km | KTM | 1S | 16 | |
| kilometre per hour | km/h | KMH | 1S | 96 | |
| kilomole | kmol | B45 | 1S | 620 | |
| kilomole per cubic metre | kmol/m³ | B46 | 1S | 647 | |
| kilonewton | kN | B47 | 1S | 192 | |
| kilonewton metre | kN.m | B48 | 1S | 202 | |
| kiloohm | k | B49 | 1S | 466 | |
| kiloohm metre | k.m | B50 | 1S | 477 | |
| kilopacket | KF | 3.9 | Z | 1454 | |
| kilopascal | kPa | KPA | 1S | 216 | |
| kilopascal square metres per gram | kPa.m²/g | 33 | 1M | 944 | |
| kilopascals per millimetre | kPa/mm | 34 | 1M | 945 | |
| kilopond | kp | B51 | 2 | X | 198 |
| kilopound per square inch | klb/in² | 84 | 3.5 | Z | 1243 |
| kiloröntgen | kR | KR | 2 | 848 | |
| kilosecond | ks | B52 | 1S | 85 | |
| kilosegment | KJ | 3.6B | 1272 | ||
| kilosiemens | kS | B53 | 1S | 469 | |
| kilosiemens per metre | kS/m | B54 | 1S | 484 | |
| kilotonne | kt | KTN | 1M | 145 | |
| kilovar | kvar | KVR | 1S | 504 | |
| kilovolt | kV | KVT | 1S | 406 | |
| kilovolt - ampere | kV.A | KVA | 1S | 501 | |
| kilovolt ampere (reactive) | K5 | 1S | 502 | ||
| kilovolt ampere reactive demand | K2 | 3.5C | Z | 1220 | |
| kilovolt ampere reactive hour | K3 | 3.5C | Z | 1221 | |
| kilovolt per metre | kV/m | B55 | 1S | 399 | |
| kilowatt | kW | KWT | 1S | 284 | |
| 327 | |||||
| 491 | |||||
| kilowatt demand | K1 | 3.5C | 1219 | ||
| kilowatt hour | kW.h | KWH | 1S | 273 | |
| kiloweber per metre | kWb/m | B56 | 1S | 439 | |
| kit | KT | 3.2B | 1037 | ||
| knot | kn | KNT | 1 | 100 | |
| labour hour | LH | 3.1B | 971 | ||
| large spray | LJ | 3.9 | Z | 1387 | |
| layer | LR | 3.9 | Z | 1460 | |
| leaf | LEF | 3.5A | 1174 | ||
| length | LN | 3.9 | Z | 1458 | |
| 1526 | |||||
| lift | 05 | 3.9 | Z | 1388 | |
| lift van | Z1 | 3.4C | Z | 1165 | |
| light year | l.y. | B57 | 2 | 33 | |
| linear centimetre | LC | 3.1C | Z | 1002 | |
| linear foot | LF | 3.1C | Z | 1003 | |
| linear inch | LI | 3.1C | Z | 1004 | |
| linear metre | LM | 3.1C | Z | 1007 | |
| linear yard | LY | 3.1C | Z | 1015 | |
| linear yard per pound | LX | 3.1C | Z | 1014 | |
| link | LK | 3.9 | Z | 1457 | |
| liquid pint (US) | liq pt (US) | PTL | 2 | 69 | |
| liquid pound | LP | 3.1C | 999 | ||
| liquid quart (US) | liq qt (US) | QTL | 2 | 70 | |
| lite | LE | 3.9 | Z | 1456 | |
| litre | l | LTR | 1 | 49 | |
| litre of pure alcohol | LPA | 3.1A | Z | 950 | |
| litre per day | LD | 1M | 304 | ||
| litre per minute | l/min | L2 | 1M | 307 | |
| litre per mole | l/mol | B58 | 1M | 629 | |
| load | NL | 3.4C | 1161 | ||
| locomotive count | 1C | 3.5C | Z | 1198 | |
| locomotive mile | 1K | 3.5C | Z | 1195 | |
| lot | LO | 3.9 | Z | 1459 | |
| lug | Z5 | 3.9 | Z | 1491 | |
| lumen | lm | LUM | 1 | 540 | |
| lumen hour | lm.h | B59 | 1S | 542 | |
| lumen per square metre | lm/m² | B60 | 1 | 544 | |
| lumen per watt | lm/W | B61 | 1 | 548 | |
| lumen second | lm.s | B62 | 1 | 541 | |
| lump sum | LS | 3.9 | Z | 1461 | |
| lux | lx | LUX | 1 | 545 | |
| lux hour | lx.h | B63 | 1S | 547 | |
| lux second | lx.s | B64 | 1 | 546 | |