Quality Inspector
Wood & Timber
Wood Volume Calculator (2026) – Round Logs & Sawn Timber Estimator
Expert Guide
Instant timber volume calculator for round logs (Hoppus Rule) and sawn planks. Nepal ma kaath ko muda volume Hoppus rule le nikalne yo free calculator ho.
⚡ Quick Answer
The Hoppus Rule (Quarter Girth) is the standard trading formula for logs in Nepal: (Girth/4)² × Length. This accounts for ~21.5% milling waste. To optimize your harvest, see our Timber Guide.
🛠️ How It Works
Professional wood volume calculation involves distinguishing between trade estimates and theoretical exacts. Site ma dherai jaso manchhe haru sodhchhan: "kaath ko muda kati cu ft huncha?". To calculate this accurately, we provide three distinct methods: Trade Standard (Hoppus), Field Approximation (1815), and Engineering Exact (π-based).
- •Select "Round Log" for raw timber or "Sawn" for cut planks/beams.
- •For Logs, choose between the Hoppus Rule (commercial standard) or True Volume.
- •Select your wood species to estimate the dry weight of the timber.
- •Results are provided in both Metric (m³) and Imperial (CFT) units.
📐 Calculation Formula
Volume = (Girth / 4)² × Length
📋 Real-Life Example
Example: Round Log of 4m length and 1.2m Girth (Hoppus).
1. Quarter Girth = 1.2 / 4 = 0.3m.
2. Volume = (0.3)² * 4 = 0.36 m³.
3. In CFT = 0.36 * 35.31 ≈ 12.7 CFT.
4. Sal Weight = 0.36 * 1000 ≈ 360 kg.
⚠️ Common Mistakes to Avoid
- ✕Using "True Volume" for commercial logs; standard trade uses the Hoppus Rule which is smaller.
- ✕Measuring Girth at only one end. You should measure at the midpoint of the log for average accuracy.
- ✕Confusing Radius with Diameter when using manual cylindrical math.
- ✕Forgetting that sawn timber measurements are often "nominal" vs "actual" in professional trade.
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❓ Frequently Asked Questions
Our calculator uses the Hoppus Rule (standard in Nepal) to give accurate CFT for round logs. Just enter girth and length for instant result.
Hoppus (Quarter Girth) = (Girth/4)² × Length. It is used because it accounts for wood wastage when cutting round logs into square timber — the commercial standard for trading in Nepal and South Asia.
Hoppus gives usable timber volume after sawing waste. True volume is the actual cylindrical space of the round log. Most builders and traders in Nepal use Hoppus for pricing.
Stop Guessing.
Start Building.
- ✕Square Feetको भ्रममा नफस्नुहोस्।(Don't get trapped in "Square Feet" rate illusions.)
- ✓Save up to 11% on materials with an accurate BOQ.
Worth NRs. 5,000
NRs. 999 🎯
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