Convert Hoppus feet to Petrograd standards
Convert Hoppus feet (H ft) to Petrograd standards (Pet. std) instantly and accurately.
Conversion Formula
Pet. std = H ft × 0.004759988869
About Hoppus feet
The Hoppus foot (H ft) is a British-Commonwealth round-log unit devised by Edward Hoppus (1736): V(H ft) = (girth/4 in)² × length/ft, yielding Ο€/4 of the true cylindrical volume ≈ 78.54% - the usable square-sawn fraction. Replaced by m³ in UK trade (1963) but still used in Sri Lanka, Malaysia, Myanmar, and Bangladesh. 1 H ft = Ο€/4 ft³ ≈ 0.02224 m³.
About Petrograd standards
The Petrograd standard (St Petersburg standard) = 165 ft³ = 4.6723 m³, representing 120 pieces of dressed Baltic softwood 12 ft × 11 in × 1.5 in = 165 ft³ exactly. Dominated 18th-19th century Baltic-to-Britain sawn-timber export trade from St Petersburg, Riga, and Danzig. Replaced by m³ in UK trade during 1970s metrication. 1 Petrograd standard = 165 ft³ = 4.6723 m³ ≈ 1,980 bf.
Quick Reference Table
| Hoppus feet (H ft) | Petrograd standards (Pet. std) |
|---|---|
| 1 H ft | 0.00475999 Pet. std |
| 2 H ft | 0.00951998 Pet. std |
| 5 H ft | 0.0237999 Pet. std |
| 10 H ft | 0.0475999 Pet. std |
| 25 H ft | 0.119 Pet. std |
| 50 H ft | 0.237999 Pet. std |
| 100 H ft | 0.475999 Pet. std |