Switch the tool, do not back-calculate yards
A 100 mm interior slab is the usual cousin of a 4 in US pad. Ready-mix in Doha and the wider GCC is sold in cubic metres, commonly rounded to 0.1 m³. Construclytic’s metric mode uses those units on the inputs so the formula ID still explains the letter.
Display currency can show QAR, AED or SAR. That converts the planning rate you typed. It is not a live plant or quarry feed and not a municipality price list.
What stays the same
Waste, purchase rounding and the planning boundary do not change because the job is in Qatar. Hot weather, pump lines and tight villa access still eat waste. Record the percentage.
Block walls, compound walls and metal fences are common on the peninsula. The wood-fence tool is still a run count — do not treat it as a boundary-wall spec.
Do it in order
- Open the calculator and choose metric before you type dimensions.
- Enter millimetres for thickness and metres for plan size.
- Keep waste visible, then replace the planning rate with a dated plant or quarry quote.
Worked example — 6.0 m × 3.6 m × 100 mm slab, 8% waste
Net volume is 6.0 × 3.6 × 0.10 = 2.16 m³. With 8% waste that is 2.33 m³, which rounds to a 2.4 m³ order on a 0.1 m³ step. The same pad in imperial is the homepage 20 × 12 × 4 in example — pick one unit system and stay there.
Planning boundary
This is a unit-system method. It is not a Qatar building-code approval, a municipality stamp or a live GCC price index.
Should I type metres and then convert to yards?
No. Switch the calculator to metric. Mixed units on one line are how orders go short.
Does QAR mean the plant quoted you?
No. Currency is a display conversion of the planning rate you entered.
Is this a Qatar building-code check?
No. Local approvals, soil and mix design still sit with the responsible professional.