Forestry Measurement and Conversion Cheat Sheet

Area Conversions:
Acres → Hectares: Useful for comparing forest plots or land parcels internationally.
Example: 50 acres × 0.404686 = 20.2343 hectares.
Square feet → Square meters: Handy for planting areas, clearings, or lumber surfaces.
Example: 100 sq ft × 0.092903 = 9.2903 m².

Length Conversions:
Chains → Meters: 1 chain = 66 ft × 0.3048 = 20.1168 m.
Feet → Meters: 1 ft × 0.3048 = 0.3048 m.
Yards → Meters: 1 yd × 0.9144 = 0.9144 m.
DBH (Diameter at Breast Height) in inches → cm: 12 in × 2.54 = 30.48 cm.

Ratios / Density:
Cord per acre → m³/ha: 1 cord/acre = 8.95647 m³/ha, useful for timber planning or biomass calculations.
Tons per acre → t/ha: 1 ton/acre = 2.24170 t/ha, helpful for forest yield or fertilizer planning.

Volume:
Cord → m³: 1 cord = 3.62456 m³, for cutting, stacking, or transport.
Board feet → m³: Essential for lumber measurement and sales.

Pacing Method for Distance Measurement:
1. What a Chain Is:
1 chain = 66 ft (20.1168 m)
1 chain = 100 links, so 1 link ≈ 0.66 ft (0.2012 m)

2. Pacing:
Count steps over the ground to estimate distances without tapes.
Walk a normal stride and convert steps into chains or meters.

3. Calibrating Your Pace:
1. Measure a known distance (1 chain / 66 ft).
2. Walk it normally, counting steps.
3. Calculate pace length:
Pace Length (ft) = 66 ft ÷ number of steps over 1 chain
4. Estimate chains for any distance:
Chains = (Total steps × Pace Length) ÷ 66 ft

Practical Use:
Measure plot boundaries, tree spacing, or trail lengths.
Combine with a compass for approximate survey lines.
Works for rectangular or circular plots.

Example:
33 steps per chain → 1 step ≈ 2 ft.
Woodlot boundary = 330 steps → (330 × 2) ÷ 66 = 10 chains.