History of Technology in India, Vol. I: From Antiquity to c. 1200 A.D. v1.c11.s1.3

v1.c11.s1.3

A highly standardised system of weights and measures was evolved by the Harappans. Two systems of measurement were used : cubits and a long foot. A cubit was about 52 cm (52.5-52.8cm) and the long foot was 33.5cm. Graduated scales with decimal graduations (upto 1.7mm) have been reported. The cubical, stone weights followed a binary system (1, 2, 1/3 × 8, 4, 8, 16, 32 upto 12800) in the lower denominations, and the traditional Indian ratio of 1:16 (1 rupee is equal to 16 annas) may derive from this. The unit weighs 13.625 gm. Higher weights follow a decimal system with fractional weights in thirds. The accuracy of these weights throughout the Harappan territory is quite remarkable.