Calculators
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Concrete take-off
Cubic yards, rebar, placement, pumping, QA testing and haul-off — the estimator that covers all 10 modules.
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What it asks and what it returns
Data in, numbers out.
You give it
Structure type (slab, footing, wall, column, stairs)
Dimensions (length × width × thickness)
Rebar schedule (#3-#8, spacing) + optional epoxy coating
Placement method (direct chute, wheelbarrow, pump truck)
Climate conditions + curing requirements
Subgrade depth for soil haul-off
Engine
It returns
Gross volume + purchase volume with waste factor
Total rebar LF + tonnage + tie wire
Pump truck cost if distance requires it
QA testing (cylinders, slump, air content) — cost + frequency
Soil tonnage to remove + haul-off cost
Labor with climate-adjusted productivity
Behind the math
How it calculates.
formula.md
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// Calculates geometric volume × density factor per structure type.
// Applies swell factor (1.20-1.45) for subgrade haul-off.
// Rebar uses spacing schedule × total LF with 5-8% waste.
// Climate triggers adjust curing time + blanket/heater costs..
Same engine the Olynx app uses
When to use it
What it's good for.
01
Quote a driveway without under-buying (or over-buying) yardage
02
Decide between direct chute vs pump truck by distance
03
Estimate excavation haul-off + correct dumpster
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