The dimension sheet is the product

14 October 2026

Ask an estimating tool for the concrete in a floor and it gives you a number. The number is the easy part. The hard part is the conversation three weeks later, when somebody asks how you got it.

What a checkable sheet looks like

Every row of QTac's Detailed Measurement sheet carries four things:

1. Where it came from: the drawing and the sheet, by name.
2. What was measured: Nos, Length, Breadth, Height or Area, each in its own column.
3. The arithmetic, in words: 108.000 sqm x 0.150 m x 1 nos = 16.200 cum.
4. A live formula, so changing a cell moves the total.

The Summary reconciles to those rows exactly. Not approximately, not after rounding: the same numbers, grouped.

Why the Assumptions sheet matters more than it looks

Every parameter you used, the scale for each sheet, how openings were treated, and every warning you acknowledged, all written down. It is the sheet nobody reads until there is an argument, and then it is the only sheet that matters.

The marked-up PDF

Numbers on a page still leave the reviewer hunting for which wall was which. So QTac also prints the drawing with every measured shape coloured and labelled M1, M2, M3, matching the dimension sheet.

Hand over both and the checking takes an hour instead of a day. That is the whole product, really. The measuring is just how you get there.