Spike's Calculators

Measurement of round timber for sale purposes in Ireland.

The volume of Irish logs is calculated using Huber's formula.

Diameters are measured mid-length of the log over bark in centimetres (cm)

Lengths are measured in metres (m) to the nearest centimetre.

A log whose length is greater than 20 metres has to be divided into two lengths for the purpose of calculating the log volume.

V = (π * Dm²) ÷ 40000 * LV = volume in cubic metres (m³)

π = 3.1416

Dm = mid-diameter (diameter of a log at exactly half its length) in centimetres

L = length in metres

V = Dm² * L * 0.00007854V = volume in cubic metres (m³)

Dm = mid-diameter (diameter of a log at exactly half its length) in centimetres

L = length in metres

0.00007854 = π ÷ 40000

- length of log in metres (m) to the nearest centimetre
- the diameter measured mid-length "outside bark" in centimetres

- log volume in cubic metres

- 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