Measuring a driveway for the calculator
The calculator prices square feet, so the quote is only as good as the measurement. The common mistake is not a bad tape reading — it is measuring the obvious rectangle and stopping. A driveway is usually a slab plus pieces that are easy to forget: the flare where it widens to meet the street, a parking pad or turnaround beside the garage, and the walkway to the front door that the customer assumes is included.
Measure each piece on its own and add them up. Rectangles are length times width. A flare is two triangles, so take the extra width at the street, multiply by how far back the widening runs, and halve it. Stop at the garage door — the garage floor is a separate surface with its own access and drainage. The driveway area tool above does the arithmetic and drops the total into the calculator.
What a slab-only measurement costs
A 20 × 45 ft slab in moderate condition, with the calculator's default costs, prices at $241. Add the pieces that were always going to be cleaned — a flare from 20 to 30 ft over the last 6 ft (30 sq ft) and a 4 × 30 ft walkway (120 sq ft) — and the same job is 1,050 sq ft at $277. Quoting the slab alone leaves $36 on the driveway, and you find out when the walkway is the last thing you wash.
Which number is setting your price
The result panel shows one recommended price, but three different rules can produce it: your minimum charge, the cost-plus floor (job cost divided by one minus your target margin), or the rate card (area × $0.22 × condition). Whichever is highest wins. On driveways the winner changes with size, and knowing which one you are looking at tells you what will and will not move the number.
At the calculator's driveway defaults — light condition, $35 per crew-hour of labor cost, $25 chemical, $20 travel, a 45% target margin and a $150 minimum:
| Driveway area | Recommended price | Per sq ft | Set by |
|---|---|---|---|
| 400 sq ft | $150 | $0.38 | Minimum charge |
| 600 sq ft | $167 | $0.28 | Cost-plus floor |
| 900 sq ft | $209 | $0.23 | Cost-plus floor |
| 1,200 sq ft | $264 | $0.22 | Rate card |
| 1,600 sq ft | $352 | $0.22 | Rate card |
With these inputs the minimum governs below about 480 sq ft, the cost-plus floor from there to about 1,040 sq ft, and the rate card above that. Dirtier driveways hand over sooner, because condition adds hours as well as rate: in moderate condition the handovers fall at about 390 and 940 sq ft, and in heavy at about 300 and 790. Change your labor cost, travel or margin and the boundaries move — the panel always reflects your own numbers.
Why cutting margin does not always cut the price
The practical consequence shows up when you discount to win a job. On a 700 sq ft driveway the cost-plus floor is in charge, so dropping your target margin from 45% to 35% takes the price from $181 to $154 — at which point the rate card ($0.22 × 700) catches it and it cannot fall further. On a 1,300 sq ft driveway the rate card was already in charge: the price is $286 at 45% and still $286 at 35%, with an effective margin of about 49% either way.
So on large driveways a margin cut is a non-event, and the only levers are the rate card and condition. On mid-size driveways it is a real discount, coming straight out of gross profit — $27 on that 700 sq ft job — while the hours and costs stay exactly the same. On small driveways nothing moves until you lower the minimum, which is usually the wrong lever: add the walkway or the patio instead and let the area carry the call-out.
Concrete, asphalt and pavers on one rate
The calculator carries one driveway rate. Plain broom-finish concrete is the job it describes. For anything that cleans slower, step the condition up rather than inventing a separate rate: it raises the rate-based price and the hours together, which is what slower work actually costs. Asphalt, exposed aggregate and stamped concrete usually belong one condition level higher than the dirt alone would suggest.
Pavers need one more decision before you quote. Cleaning between the units can wash out the joint sand, and whether you replace it is a scope question, not a pricing nuance. If re-sanding or sealing is part of the job, price it as its own line after the wash; if it is not, say so on the quote so the customer is not expecting it.