Check the path
Your calculation audit
Every total is shown as a short sequence so you can see what was measured, deducted, adjusted and rounded.
- 01Awaiting valid measurementsComplete the fields above to reveal the formula path.
Tiling
Tile adhesive calculator
Estimate tile adhesive weight and rounded bags from surface area, product coverage rate and allowance.
Transparent formulaFormula v1.0 · surface area × selected coverage rate × waste allowance
Scope boundary: Adhesive quantity estimate only — use the selected product's coverage and application guidance for the actual surface and tile.
Measure clearly
Simple guidance
Measure the finished tiled area, then enter the coverage rate printed for the adhesive product you are considering. This calculator uses that rate directly rather than guessing the product or application method.
Worked example
Follow the same logic
At 8 m² and a selected 4 kg/m² coverage rate, base adhesive is 32 kg. A 10% allowance gives 35.2 kg, which rounds to two 20 kg bags.
Planning tipWrite down the product factor or pack size you used, so a later change is easy to trace.
Before you buy
Three quick checks
- 01
Use the coverage rate stated for the exact adhesive product where available.
- 02
Check the chosen bag size before using the rounded purchase quantity.
- 03
Keep product selection and application guidance with the materials list.
Quick answers
Useful to know
Why do I enter a coverage rate?
Adhesive use is product- and application-specific. Entering the chosen product's stated kg/m² rate makes the assumption visible and adjustable.
Does this decide which adhesive to use?
No. It estimates quantity from the rate you provide. Choose the product and follow its stated application guidance for the actual tile and surface.
Review record
Transparent calculation method
Last reviewed: 2026-10-17. Formula version: v1.0. Classification: adhesive quantity estimate.
Formula source: src/calculator.js. Uses visitor-entered measurements and product values.