Three different numbers
- Measured quantity
- The geometry or area entered: for example, 6 × 4 × 0.1 = 2.4 m³ of concrete.
- Quantity with allowance
- The measured amount plus a deliberate allowance. Adding 10% to 2.4 m³ gives 2.64 m³. The example percentage is editable, not a universal recommendation.
- Purchased quantity
- Whole packs, bags or stock lengths. At a hypothetical 12 L mixed yield, 2.64 m³ needs 220 bags. An order may also be affected by supplier increments and the cutting layout.
Where the inputs come from
Dimensions come from your measurements or drawings. Coverage, mixed yield, pack size and material properties should come from the exact product label or current manufacturer information. The starting values are illustrative; they are not a product selection, a building specification or a local compliance check.
When a page links to a manufacturer’s general calculator, that link is a product reference. It does not mean the manufacturer reviewed Job Totals or endorsed the starting values. A project-specific source is identified beside the corresponding claim.
What is checked
The arithmetic is checked against separately specified examples, including unit conversions, invalid inputs and rounding. Saved project entries retain their own measurements and allowances. Examples that compare two scenarios use the same calculation rules as the working tool, and their published answers are checked separately.
These checks establish how the model behaves. They cannot verify a measurement made on site, decide whether a product is suitable or replace a cutting schedule. Area-based sheet counts, pooled stock lengths and roll coverage are particularly sensitive to the actual layout.
What the project records establish
The Nowra record reconstructs sheet and paint quantities from supplied photographs and dimensions. Actual purchases and paint consumption were not recorded. The Villawood record includes a measured footprint, a photographed pack label and Emir’s reported use of 16 packs; it does not turn an unrecorded leftover quantity into a waste percentage.
Illustrative comparisons are labelled as examples. They are not additional completed jobs, customer testimonials or claims of independent certification.
Keep the estimate usable
- Replace the example inputs and confirm each unit.
- Use a separate item where the product, thickness, coverage or measurement basis changes.
- Apply each allowance once, and round up at the purchasing stage.
- Compare the result with the product information and your layout.
- Give saved items a clear name, then check the project list before printing.
Corrections and maintenance
Emir operates Job Totals and accepts corrections through the contact page. Include the calculator URL, inputs, units, result and expected calculation. Updated wording is dated on the affected pages; source dates on project records refer to the material actually checked.
Method explained 19 October 2026. About Emir and Job Totals