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🧱 Free Block Calculator

Estimate concrete blocks, mortar, cement and sand for walls. Supports custom block sizes, deductions, multiple walls, and waste calculation.

➕ Deductions (Doors / Windows)

What is a Block Calculator?

BuildCostMate's free block calculator helps you estimate the number of concrete blocks required to build a wall. It also calculates the approximate quantity of mortar, cement, and sand needed for block masonry work.

How to Use the Block Calculator

  1. Choose your preferred measurement unit (Feet or Meter).
  2. Select a standard block size or choose Custom Block Size and enter the block dimensions.
  3. Enter the wall length and wall height.
  4. Add door and window deductions if required.
  5. Select the waste percentage or enter a custom waste value.
  6. Click the Calculate button.
  7. View the estimated number of blocks, mortar volume, cement bags, sand quantity, and Sankra value (optional).

Supported Block Sizes

This calculator supports the most commonly used concrete block sizes, including 400×200×200 mm (16×8×8 in), 400×200×150 mm (16×8×6 in), 400×200×100 mm (16×8×4 in), as well as custom block sizes in millimeters and inches.

Frequently Asked Questions

How many concrete blocks do I need?

The number of blocks depends on the wall length, wall height, block size, and any door or window openings. This calculator automatically estimates the required number of blocks based on your inputs.

Does this calculator include mortar?

Yes. The calculator estimates the mortar volume required for the wall and also calculates the approximate cement bags and sand quantity needed for the mortar.

Can I use custom block sizes?

Yes. You can select Custom Block Size and enter the block dimensions in either millimeters or inches.

Is the BuildCostMate Block Calculator free?

Yes. The Block Calculator is completely free to use and works on desktop, tablet, and mobile devices without requiring registration.

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