The tola (Hindi: तोला; Urdu: تولا tolā) also transliterated as tolah or tole, is a traditional Ancient Indian and South Asian unit of mass, now standardised as 180 grains (11.6638038 grams) or exactly 3/8 troy ounce. It was the base unit of mass in the British Indian system of weights and measures introduced in 1833, although it had been in use for much longer. It was also used in Aden and Zanzibar: in the latter, one tola was equivalent to 175.90 troy grains (0.97722222 British tolas, or 11.33980925 grams).