Kilogram (kg) ko te waahanga paerewa mō te mass i te Pūnaha Rerekē o Ngā Raraunga (SI), e whakamahia nuitia ana i te ao o ia rā me ngā rangahau pūtaiao. Gram (g) he 1/1000 o te kilogram, ā, e whakamahia nuitia ana hei ine i te mass o ngā taonga iti ake. Milligram (mg) he 1/1000 o te gram, ā, he mea noa hei ine i te mass o ngā taonga tino iti, pēnei i ngā rongoā. Ton (ton) he rahi ake o te rēhita mō te mass, e whakamahia nuitia ana mō ngā taonga taumaha, ranei mō te transport. Pound (lb) ko tētahi o ngā rēhita Īmira, e whakamahia nuitia ana i te ao o ia rā i te UK me te US, ā, mō te taumaha tinana. Ounce (oz) ko tētahi atu rēhita Īmira, e whakamahia nuitia ana mō te mass o ngā taonga iti, pērā i ngā kai me ngā taonga parai. Stone (stone) he rēhita mō te mass e whakamahia nuitia ana i te UK, kei reira ko te 1 stone he 14 pound. Long ton (long ton) he ton Īmira, kei reira ko te 1 long ton he 2240 pound. Short ton (short ton) he ton US, kei reira ko te 1 short ton he 2000 pound. Carat (carat) he rēhita mō te mass e whakamahia ana i te umanga parai, kei reira ko te 1 carat he 0.2 gram. Drachm (drachm) he rēhita rongonui o mua mō te mass, kei reira ko te 1/16 ounce. Scruple (scruple) he rēhita rongoā rongonui o ngā Irihī, kei reira ko te 1 scruple he 1/24 ounce. Metric ton (metric ton) ko te rēhita mō te mass i te Pūnaha Rerekē, kei reira ko te 1 metric ton he 1000 kilogram. Quintal (quintal) he 1/10 o te metric ton, ā, e whakamahia nuitia ana i te ahumahi, inā rā te hanga me te hokohoko parai. Poundal (poundal) ko te rēhita Īmira mō te kaha, kei reira ko te 1 poundal he 0.1382 kilogram. Long hundredweight (long hundredweight) ko te rēhita Īmira, kei reira ko te 1 long hundredweight he 112 pound. Short hundredweight (short hundredweight) ko te rēhita US, kei reira ko te 1 short hundredweight he 100 pound. Grain (grain) ko te rēhita iti rawa mō te mass, kei reira ko te 1 grain he 64.798 milligram. Carat (carat, metric) ko te rēhita e whakamahia nuitia ana i te umanga parai me ngā parai kohatu, kei reira ko te 1 carat he 0.2 gram.