Construction business
Footing and trench concrete
Add concrete volumes for supplied rectangular footing or trench runs, with repeat counts, allowance and optional bag or ready-mix costs.
Your inputs
Complete the fields for your selected method. Zero means intentionally zero, not unknown. Currency selection labels amounts; it does not convert exchange rates.
How this calculation works
net volume = sum(run length × width × concrete depth × repeat count)
Quantity and supplied-cost arithmetic only. Verify measurements, product coverage and purchasing units. Prefilled values and allowances are illustrative, not recommended specifications. No structural sizing, code approval, installation design or optimized cutting layout is supplied. Optional zero prices are omitted; unknown costs are not assumed free. Supply dimensions from an approved plan or measured form; dimensions are not designed here. Shared corners and crossing trenches overlap, so divide them into nonoverlapping solids before entering. Reinforcement, soil bearing, excavation stability, frost depth, forms and delivery are excluded.
What information do I need?
Use records for the same job, equipment or accounting period. Only the fields for your selected entry method are required. An unknown amount is not zero.
Input definitions and where to find them
- Nonoverlapping footing or trench runs: Use a measured quantity, product label, supplier quote or explicit assumption on the stated basis. Zero is intentional exclusion, not an unknown value.
- Run name: Use matching records or an explicitly identified assumption for run name. Unknown is not the same as zero.
- Run length (ft): Measure this dimension and select feet, inches or meters. Use actual product dimensions rather than a nominal trade size unless this field explicitly asks for nominal module coverage.
- Concrete width (ft): Measure this dimension and select feet, inches or meters. Use actual product dimensions rather than a nominal trade size unless this field explicitly asks for nominal module coverage.
- Concrete depth (ft): Measure this dimension and select feet, inches or meters. Use actual product dimensions rather than a nominal trade size unless this field explicitly asks for nominal module coverage.
- Matching repeated runs (runs): Use matching records or an explicitly identified assumption for matching repeated runs. Unknown is not the same as zero.
- Your extra material allowance (%): Extra material above the net measured requirement. Supply an allowance appropriate to your cuts, handling and product; the example is not an industry recommendation.
- Actual mixed concrete yield per bag (ft³): Use volume in cubic feet, cubic yards or cubic meters. For bags, read the actual mixed/delivered yield per bag; bag weight is not bag volume.
- Optional price per cubic yard (selected currency): Use a measured quantity, product label, supplier quote or explicit assumption on the stated basis. Zero is intentional exclusion, not an unknown value.
- Optional price per bag (selected currency): Use a measured quantity, product label, supplier quote or explicit assumption on the stated basis. Zero is intentional exclusion, not an unknown value.
Use the Where to find this value controls beside the inputs for available work-it-out helpers. Estimates remain your assumptions; a helper does not verify the source figures.
Worked example
Example amounts use US dollars (USD).
Example answer: Net concrete volume is 2.9630 yd³ for the illustrative inputs below.
Example inputs
- Nonoverlapping footing or trench runs
- Run name: Footing run
- Run length: 40.00 ft
- Concrete width: 2.00 ft
- Concrete depth: 1.00 ft
- Matching repeated runs: 1 runs
- Your extra material allowance: 10.00 %
- Actual mixed concrete yield per bag: 0.60 ft³
- Optional price per cubic yard: $0.00
- Optional price per bag: $0.00
- Net concrete volume
- 2.9630 yd³
- Order volume including allowance
- 3.2593 yd³
- Whole bags at supplied yield
- 147 bags
- Bagged volume after rounding
- 3.2667 yd³
- Ready-mix material subtotal
- No price supplied
- Bagged material subtotal
- No price supplied
- Ready-mix and bagged material subtotals are alternatives, not costs to add together. Delivery, minimum loads, labor and unentered charges are excluded.
These illustrative values are not recommended rates or industry averages. Replace every example input with your own figures.
Use the result well
Compare net installed quantities with allowances and whole purchased units. Review product instructions and missing materials before ordering.
Keep inputs on the same scope and time basis. Calculations retain precision internally; displayed values generally round to two decimal places, with extra precision for very small values and whole-unit rounding where required. Economic comparisons describe your supplied assumptions and do not guarantee future results.
This tool provides business arithmetic. It does not approve engineering designs, establish legal or tax treatment, select equipment or certify safe operating conditions.