What formula is used to calculate wood square bar weight?

The formula is: Weight = Side² × Length × Density. Side length and bar length (both entered in mm) are converted to meters. Side is squared to get the cross-sectional area (m²), multiplied by length to get volume (m³), then multiplied by the wood species density (kg/m³) to obtain weight in kilograms.

What are typical densities for common wood species?

Pine is approximately 500 kg/m³, Oak 700 kg/m³, Birch 650 kg/m³, Mahogany 550 kg/m³, Teak 630 kg/m³, Walnut 640 kg/m³, Cherry 580 kg/m³, and Maple 720 kg/m³. These are average air-dry densities and can vary slightly with moisture content.

Why does moisture content affect wood density?

Wood is hygroscopic — it absorbs or releases moisture depending on the environment. Wetter wood is heavier. The density values in this calculator assume standard air-dry conditions (approximately 12% moisture content), which is typical for kiln-dried lumber used in construction and furniture.

Which wood species is the heaviest?

Among the species listed, Maple is the heaviest at 720 kg/m³, followed by Oak at 700 kg/m³. Pine is the lightest at 500 kg/m³, making it popular when weight is a concern.

Can I use this calculator for rectangular bars?

This calculator is specifically for square cross-sections (Side × Side). For rectangular bars, the area would be Width × Height instead of Side². A separate rectangular bar weight calculator would apply that formula.

How accurate is this calculator?

Results are accurate for bars with uniform density and standard air-dry moisture content. Real-world weights may vary by ±5–10% due to natural variation in wood grain, knots, and moisture. For critical load calculations, always verify with a physical scale.

Wood Square Bar Weight Calculator

Name: Wood Square Bar Weight Calculator
Availability: InStock
Author: Nham Vu

Enter side length, bar length, and wood species to instantly calculate the weight of a solid square wooden bar in kg and grams.

Bar Dimensions

Side Length (mm)

Bar Length (mm)

Wood Species

Formula Reference

W = S² × L × ρ

Where S = side length (m), L = bar length (m), ρ = wood density (kg/m³), W = weight (kg). All mm inputs are converted to meters before calculation.

Enter dimensions on the left and click Calculate.

Wood Species Densities (Air-Dry)

Species	Common Use	kg/m³
Pine	Framing, shelving, furniture	500
Oak	Flooring, cabinetry, barrels	700
Birch	Plywood, furniture, cabinets	650
Mahogany	Furniture, boat building, decor	550
Teak	Outdoor furniture, marine decks	630
Walnut	Fine furniture, gunstocks, carving	640
Cherry	Furniture, cabinets, musical instruments	580
Maple	Flooring, cutting boards, sports equipment	720

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Summary

Enter side length, bar length, and wood species to instantly calculate the weight of a solid square wooden bar in kg and grams.

How it works

Enter the bar side length in millimeters.
Enter the bar length in millimeters.
Select the wood species from the dropdown.
The calculator applies W = Side² × Length × Density and converts to meters internally.
Results are shown in kilograms and grams.
Click Copy to save the result to your clipboard.

Use cases

Estimating lumber weight for construction and carpentry projects.
Calculating freight and shipping weight for wood bar stock orders.
Comparing wood species by weight to choose the right material for a build.
Preparing bill of materials for furniture or joinery work.
Checking load limits for wooden shelves and structures.
Material planning for woodworking and cabinetry.
Cost estimation for timber square bar purchases by weight.
Comparing wood weight to metal bars for the same cross-section.

Frequently Asked Questions

Last updated: 2026-06-11 · Reviewed by Nham Vu