Spike's Calculators

Formula developed by the Japanese Ministry of Agriculture and Forestry.

Lengths are measured in metres and tenths of metres and rounded down to each fixed-length class

For small-end diameters less than 14 cm

Measure the shortest small-end diameter inside the bark through the centre of the log. Round down to the nearest whole centimetre.

Example: 12.00 - 12.99 cm, enter 12 cm

For small-end diameters equal to and greater than 14 cm

Measure the shortest small-end diameter inside the bark through the centre of the log.

Round down to the nearest even 2-cm interval.

Example: 16.00 - 17.99 cm, record as 16 cm

If the short axis is between 14 and 40 cm, add 2 cm to the short axis for every 6 cm of difference. If
the short axis exceeds 40 cm, add 2 cm to the short axis for every 8 cm of difference.

Example:

S=16.00 - L=22.99 cm, record as 18 cm S=16.00 - L=32.99 cm, record as 28 cm S=42.00 - L=45.99 cm, record as 42 cm S=41.00 - L=49.60 cm, record as 43 cm

- Brereton Log Rule - Metric Measurements
- Burt's Quarter Girth Method
- Chinese National Standard
- Cubic Metre Rule
- Francon Measure
- Hoppus Rule
- Huber's Formula
- Ireland - Log Volume Measurement
- Japanese Agricultural Standard (JAS)
- Manitoba - Cubic Method
- Newton's Formula
- Nova Scotia Cubic Metre Log Scale
- Pressler's Cubic Foot Formula
- Smalian's Formula - Metric
- Smalian's Formula - Imperial
- Solid Volume of a Log
- Spike's Rule
- Swedish Log Volume Calculation
- Swedish Log Volume Calculation Method One
- Swedish Log Volume Calculation Method Two
- Swedish Log Volume Calculation Method Three
- William Klemme