Even experienced gardeners make mistakes when ordering materials. Here are the 7 most common mistakes and how to avoid them.
The Mistake: Ordering exactly the calculated amount.
The Fix: Add 10-15% extra for soil settling and compaction. Topsoil especially settles 10-20% over time.
The Mistake: Calculating only length × width without considering depth.
The Fix: Always include depth. A thin 5cm layer of mulch uses way less material than a 15cm layer.
The Mistake: Ordering “5 tons of gravel” when you needed “5 cubic meters.”
The Fix: Volume (cubic meters) and weight (tons) are different. 1 m³ of gravel weighs about 1.6 tons.
The Mistake: Assuming all materials have the same density.
The Fix: Sand is 3x heavier than mulch. Check our density table before calculating.
The Mistake: Calculating the full rectangular area when paths or borders are in the way.
The Fix: Subtract paths, stones, and fixed features from your total area.
The Mistake: Bags come in 15, 20, 25, 30, or 40kg sizes. Using wrong size in calculation gives wrong bag count.
The Fix: Check the exact bag weight before calculating. Our calculator uses standard sizes.
The Mistake: Budgeting only for material cost.
The Fix: Delivery can be 20-40% of total cost for small orders. Factor this into your budget.
Always use a proper calculator for accurate results. Our garden weight calculator handles all these factors automatically and gives you total weight, volume, bag count, and cost in one click.