Persian unit Persian name Relation to previous unit Metric Value Imperial Value
finger aiwas ≈ 20 mm ≈ 0.8 in
hand dva 5 aiwas ≈ 100 mm ≈ 4 in
foot trayas 3 dva ≈ 300 mm ≈ 1 foot
four-hands remen 4 dva ≈ 400 mm ≈ 16 in
cubit (five-hands) pank'a dva 5 dva ≈ 500 mm ≈ 20 in
great cubit (six-hands) (k)swacsh dva 6 dva ≈ 600 mm ≈ 2 ft
pace pank'a 5 trayas ≈ 1.5 m ≈ 5 ft
ten-foot daca trayas pank'a ≈ 3 m ≈ 10 ft
hundred-foot chebel 8 daca trayas ≈ 24 m ≈ 80 ft
league, the distance a horse could walk in one hour. parasang 250 chebel ≈ 6 km ≈ 3.75 miles
mansion, one day's march on the Royal Road. (Greek stathmos) 4 or 5 parasang ≈ 24–30 km ≈ 14–18 miles