Practical guide
Brick Mortar for Maxi Bricks and Thin Brick: What to Enter
Mortar estimates depend on the material and installation method. Use a confirmed wet rate for full masonry, wet yield for premix bags, and product coverage for thin brick fixing or pointing. The brick mortar calculator keeps these methods separate.
Updated 15 October 2026
Reviewed by the 99Tools team. Editorial and corrections policy.
Full masonry and thin brick have different inputs
A full brick wall uses mortar in its bedding and vertical joints. A thin brick finish may instead use a specified fixing bed or adhesive plus material between the visible units. The same surface area does not make those products interchangeable. Identify the exact system before estimating a purchase and obtain the required product and installation instructions.
Maxi brick mortar: use the actual rate
The label maxi describes a brick format, not a guaranteed mortar consumption. Ask for a rate for the actual unit, joint arrangement and bedding practice. Enter the net wall area and one-leaf wet rate, then select the number of similar masonry leaves. Do not multiply by two just because the wall has two visible faces. For different leaf materials, estimate each separately.
Separate cement and sand from premix bags
Site-mixed mortar needs a specified ratio by volume and agreed conversion assumptions. Premix is a formulated product and needs its usable wet yield per bag. Never interpret a 50 kg premix bag as 50 kg of cement. For example, a hypothetical 0.88 m³ wet requirement and 25 litres per premix bag require 36 bags. The 25-litre yield is an arithmetic example only; replace it with the label value.
Thin brick fixing and pointing quantities
Use the product-coverage method for one approved product at a time. Obtain kg/m² for the actual application, including the specified bed, trowel and joint conditions where relevant. A hypothetical 10 m² surface at 4 kg/m² with 10% extra requires 44 kg, or three 20 kg bags. This does not establish suitability or a universal thin brick rate. Repeat the calculation for pointing using its own product data.
Allowances, opening deductions and spares
Measure only the area being treated and deduct openings once. Ask whether a coverage rate already includes expected loss before adding another allowance. Batch size, mixing waste and surface irregularity can change actual use. Keep a record of your inputs and supplier assumptions so another person can check the arithmetic before ordering.
Confirm the job specification
A quantity calculation does not set mortar strength or establish adhesive compatibility, substrate preparation, movement details or exterior suitability. Follow the responsible designer and manufacturer for those decisions. The tool does not calculate water, waterproofing, plaster, concrete, filled cores or labour. It provides an estimate for the materials and method you entered.
Use the related calculators
Apply the explanation above with your own figures. Open a calculator below, check every input and review the result assumptions before making a decision.
Frequently asked questions
How do I calculate brick mortar?
Multiply net masonry area by the number of similar leaves and the confirmed wet mortar rate for one leaf. Add one allowance, then use the specified mix for separate cement and sand or the bag yield for premix.
Can I use this as a maxi brick mortar calculator?
Yes. Enter the mortar rate confirmed for your actual maxi brick and joint arrangement. There is no universal maxi-brick discount or automatic rate change.
How do I calculate thin brick mortar or adhesive bags?
Use product coverage with the manufacturer’s kg/m² and bag mass. Calculate the fixing product and pointing product separately using their own coverage figures.
Is premix bag mass the same as cement mass?
No. A premix mortar bag contains its formulated ingredients. Use its stated wet yield, rather than treating the entire bag as cement.
Is a 1:6 mortar mix always correct?
No. It is an editable example for quantity arithmetic. The required mortar specification must be confirmed for the materials, exposure and job.
Does this calculate the amount of water?
No. Follow the selected product or specified mixing instructions. Water cannot be inferred reliably from the purchasing estimate alone.