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Wall and Fence Block Calculator

Estimate the number of sandcrete blocks required for a wall or fence from its length, height, openings and wastage.

Free daily preview

Calculate your quantity

1 use per day

This calculator may be used once per day in this browser. Results are planning aids and should be checked by a qualified local professional.

How to use this wall blocks calculator

Use net wall area instead of guessing by room count. This preview estimates blocks only. Mortar, cement, sand, pillars and a complete costing remain in Build Estimate.

  1. Enter measurements from the latest drawing or a verified site measurement.
  2. Check that every value uses the unit shown beside the field.
  3. Choose a realistic allowance where the calculator asks for wastage.
  4. Review the preview, then use the app for the full material and cost breakdown.

What makes a useful construction estimate?

A useful estimate keeps dimensions, assumptions, quantities and prices separate. That makes it possible to update one local price or site measurement without rebuilding the whole calculation. Always confirm structural, soil, safety and specification decisions with the appropriate qualified professional.

Transparent planning preview. This page states what it calculates and what remains locked. It does not pretend that a short web form replaces drawings, site checks or professional judgement.