Traditional Swedish units of measurement were standardized by law in 1665, prior to which they only existed as a number of related but differing local variants. The system was slightly revised in 1735. In 1855, a decimal reform was instituted that defined a new Swedish inch as 1⁄10 Swedish foot (2.96 cm or 1.17 inches). Up to the middle of the 19th century, there was a law allowing the imposition of the death penalty for falsifying weights or measures. After a decision by the parliament in 1875, Sweden adopted the metric system on 22 November 1878, with a ten-year transition period until 1 January 1889.
As part of the transition, the Swedish mil measurement was maintained, but was shortened from 18000 alnar – the equivalent of 10.69 km (6.64 mi) – to exactly 10 kilometres (6.2 mi). This measurement is still in use in both Sweden and Norway (which were in a union at the time).
The Swedish units of measurement system was in effect also in Finland until 1809, and thereafter supplanted with the Russian units of measurement. Finland went Metric 1886.
The Swedish units of length included the following:
| unit | relation to previous | metric value | Imperial Value |
|---|---|---|---|
| pot | - | 0.966 L | 0.850 imp qt; 1.021 US qt |
| tunna | 2 spann | - | |
| ankare | - | 39.26 L | 34.54 imp qt; 41.49 US qt |
| åm | 155 pottor | 149.73 L | 131.74 imp qt; 158.22 US qt |
| storfamn | - | 3770 L (3.77 m³) | 3,320 imp qt; 3,980 US qt (830 imp gal; 1,000 US gal or 133 cu ft) |
| kubikfamn | - | 5850 L (5.85 m³) | 5,150 imp qt; 6,180 US qt (1,290 imp gal; 1,550 US gal or 207 cu ft) |
| unit | relation to previous | metric value | Imperial Value |
|---|---|---|---|
| skeppspund | 20 lispund | 170.03 kg | 374.852 lb |
| bismerpund | 12 skålpund | 5.101 kg. | 11.246 lb |
| lispund | 20 skålpund | 8.502 kg | 18.744 lb |
| skålpund | 2 mark | 0.42507 kg | 0.937 lb |
| mark | 50 ort | 212.5 g | 7.496 oz |
| ort | 4.2508 g | 65.6 gr |
| unit | relationship | metric value | Imperial Value |
|---|---|---|---|
| nautisk mil | 1852 m | 2,025 yd | |
| distansminut | 1852 m | 2,025 yd | |
| sjömil (modern) | 1852 m | 2,025 yd |