Timber Volume Calculator

The Timber Volume Calculator estimates the total timber volume in cubic feet or cubic meters. Simply enter your shape type, length, and dimensions to calculate your timber volume for any piece of lumber or log. This calculator helps builders, foresters, and woodworkers better understand how much wood they have. This calculator also calculates the volume in the alternate unit for easy comparison.

Choose feet or meters for your measurements
Pick the shape that matches your timber
Enter the length of the timber piece
Enter the width of the rectangular timber
Enter the height or thickness of the timber

This calculator is for informational purposes only. Verify results with appropriate professionals for important decisions.

Use this timber volume calculator to plan material purchases, estimate shipping needs, or compare lumber sizes for your next building project.

What Is Timber Volume

Timber volume is the amount of space a piece of wood takes up. It is measured in cubic feet or cubic meters. Knowing the volume tells you how much wood you really have, not just how long or wide it looks. This number matters when you buy, sell, or plan with lumber and logs. It gives you a fair way to compare pieces of different shapes and sizes.

How Timber Volume Is Calculated

Formula

Rectangular: Volume = Length x Width x Height
Cylindrical: Volume = pi x (Diameter / 2)² x Length

Where:

  • Length = the longest side of the timber (ft or m)
  • Width = the side-to-side measurement of a rectangular piece (ft or m)
  • Height = the top-to-bottom thickness of a rectangular piece (ft or m)
  • Diameter = the full width across a round log (ft or m)
  • pi = about 3.1416
  • Volume = the total space the timber fills (ft³ or m³)

For a rectangular piece like a plank or beam, you multiply the three sides together. Think of it like filling a box: the length times the width times the height tells you how many cubic units fit inside. For a round log, you first find the area of the circle at the end. You do this by cutting the diameter in half to get the radius, squaring that number, and multiplying by pi. Then you stretch that circle area along the length of the log to get the full volume.

Why Timber Volume Matters

Knowing the exact volume of your timber helps you buy the right amount and avoid waste. It also helps you price wood fairly and plan projects with confidence.

Why Accurate Volume Estimation Is Important for Material Planning

If you guess the volume wrong, you may order too little wood and delay your project. You could also order too much and spend money on material you do not need. A good volume estimate helps you stay on budget and on schedule. It also reduces leftover scrap that goes to waste.

For Material Purchasing and Cost Planning

When you buy timber, the price is often based on volume. If you know the volume you need, you can compare quotes from different sellers more easily. You may also find that one shape or size gives you more usable wood for the same price. This helps you make smarter choices with your money.

For Irregular or Tapered Logs

Real logs are rarely perfect cylinders. They often taper from one end to the other or have bumps and bends. The standard formula assumes a perfect shape, so it may give a slightly higher number than the true usable volume. For tapered logs, you may consider measuring both ends and using an average diameter for a closer estimate.

Timber Volume vs Board Feet

Board feet is another common way to measure lumber in the United States. One board foot equals a piece of wood that is 1 inch thick, 12 inches wide, and 12 inches long, or about 0.0833 cubic feet. Timber volume in cubic feet or cubic meters measures the full solid space, while board feet is a thickness-based unit used mostly for sawn lumber. Mixing them up may lead to ordering mistakes, so it is important to know which unit your seller is using.

Calculation logic verified using publicly available standards.

View our Accuracy & Reliability Framework →