Concrete Cost Calculator

Formula notes

• Net volume is the entered concrete quantity converted to cubic metres.
• Order volume = net volume x (1 + waste percentage / 100).
• Base concrete cost = net volume x unit rate after converting the selected unit-rate basis.
• Total concrete cost = order volume x unit rate after converting the selected unit-rate basis.
• Waste allowance cost = total concrete cost - base concrete cost.
• The monetary outputs use the same currency as the unit rate entered by the user.
• 1 m3 is approximately 1.307950619 yd3.
• 1 yd3 is approximately 0.764554858 m3.
• 1 m3 is approximately 35.31466672 ft3.
• Worked example: net concrete volume = 20 m3, unit rate = 120 currency units per m3, waste allowance = 5 percent. Order volume = 21.000 m3. Base cost = 2400.00. Waste allowance cost = 120.00. Total estimated concrete cost = 2520.00 currency units.
• QA test 1: volume 20 m3, rate 120 per m3, waste 5 percent => net 20.000 m3; order volume 21.000 m3; base cost 2400.00; total cost 2520.00.
• QA test 2: volume 10 m3, rate 150 per m3, waste 0 percent => net 10.000 m3; order volume 10.000 m3; base cost 1500.00; total cost 1500.00.
• QA test 3: volume 30 yd3, rate 145 per yd3, waste 7 percent => net approximately 22.937 m3; order volume approximately 24.542 m3; base cost 4350.00; total cost 4654.50; waste allowance cost 304.50.
• QA test 4: volume 500 ft3, rate 4.25 per ft3, waste 10 percent => net approximately 14.158 m3; order volume approximately 15.574 m3; base cost 2125.00; total cost 2337.50.
• QA test 5: volume 12500 L, rate 110 per m3, waste 3 percent => net 12.500 m3; order volume 12.875 m3; base cost 1375.00; total cost 1416.25.
• QA test 6: volume 15 m3, rate 160 per yd3, waste 8 percent => order volume 16.200 m3; base cost approximately 3139.08; total cost approximately 3390.21; waste allowance cost approximately 251.13.

Assumptions

• The concrete volume entered by the user is the net geometric or measured quantity before waste unless the user intentionally enters an already adjusted quantity.
• The unit rate is supplied by the user and is assumed to correspond exactly to the selected rate basis.
• The calculator does not obtain live supplier, contractor, company, regional, or market rates.
• The same currency is used throughout the calculation. No currency conversion is performed.
• The waste or contingency percentage is applied directly to the net concrete volume.
• The calculator estimates concrete material cost only unless the entered unit rate already includes other cost components.
• Unless included in the user-supplied unit rate, the result excludes reinforcement, formwork, labour, equipment, concrete pumping, placing, finishing, testing, curing, transport surcharges, short-load charges, waiting time, admixtures, taxes, escalation, overhead, profit, and other project costs.
• Ready-mix suppliers may impose minimum order quantities, truck-load increments, delivery charges, or rounding rules that are not automatically included.
• Actual concrete consumption can differ from theoretical quantities because of excavation tolerances, uneven subgrade, overbreak, formwork movement, dimensional variation, spillage, pumping losses, rejected loads, and site conditions.
• The appropriate waste percentage should be selected using company procedures, historical productivity data, project conditions, supplier requirements, and professional judgement.
• The estimating / project basis selection is informational and does not change the arithmetic cost result.

References

• Standard construction estimating and quantity takeoff practice.
• Project bills of quantities, approved drawings, specifications, and quantity measurement procedures.
• Contractor or company cost databases and historical project records.
• Ready-mixed concrete supplier quotations and applicable delivery conditions.
• Applicable local methods of measurement, tender requirements, project controls procedures, and company estimating standards.