Nidaamka Caalamiga ah ee Unugyada (SI) waa nidaamka ugu badan ee la isticmaalo ee cutubyada lagu cabbiro tirada jirka. SI waxaa loo isticmaalaa inta badan wadamada aduunka iyo ku dhawaad had iyo jeer sayniska.
Jadwalka hoose wuxuu bixiyaa macluumaadka 7da unug ee aasaasiga ah ee SI: magaca iyo magacaabista (iyo Ingiriisi/caalami), iyo sidoo kale qiimaha la cabbiray.
| Magaca unugga | magacaabida | Qiime la cabiray | ||
| Engl. | Engl. | |||
| labaad | labaad | с | s | Time |
| Meter | meter | м | m | Dhererka (ama fogaanta) |
| kiilo | kiilo | kg | kg | Miisaanka |
| Amps | Amps | А | A | Awoodda hadda korontada |
| Kelvin | Kelvin | К | K | Heerkulka Thermodynamic |
| Mole | bar | bar | bar | Qadarka walaxda |
| Candela | Shumaca | cd | cd | Awoodda iftiinka |
Fiiro gaar ah: Xitaa haddii waddan uu isticmaalo nidaam ka duwan, isku-dhafan gaar ah ayaa loo dejiyey canaasiirkiisa, taas oo u oggolaanaysa in loo beddelo unugyada SI.