Total repeated rectangular footing runs
Use this takeoff after footing dimensions have been specified by an appropriate plan or professional. Enter the length of one run and use count only for identical runs.
Group footings by dimensions and calculate each group separately. This avoids applying one width or depth to unlike strips, pads, or grade beams.
How this tool differs: This calculator multiplies one identical rectangular footing run by a whole-number count. It estimates concrete only and must not be used to choose footing width, depth, reinforcement, bearing area, or foundation design.
Formula and calculation method.
Order volume = one-run length × width × depth × whole-number count × (1 + waste ÷ 100)Width and depth are converted from inches or centimetres, then multiplied by one run’s length. Count duplicates the entire run, and waste is applied to the combined volume.
See the concrete estimate in context.
Continuous strip footing
Run length 48 ft; width 16 in; depth 8 in; count 1; waste 10%
Working: 48 × (16 ÷ 12) × (8 ÷ 12) ÷ 27 × 1 × 1.10
Result: 1.74 yd³ to order
Count stays at one because 48 ft is already the complete length of this modeled run.
Six identical short runs
Run length 8 ft; width 12 in; depth 8 in; count 6; waste 5%
Working: 8 × 1 × (8 ÷ 12) × 6 ÷ 27 × 1.05
Result: 1.24 yd³ to order
Count six means six separate runs, each 8 ft long with exactly the entered cross-section.
Turn the number into an order plan.
- Confirm whether length means one repeated run or a total combined length; do not multiply both a combined length and its count.
- Use separate calculations when any footing has a different width, depth, or shape.
Assumptions and common mistakes.
Assumptions
- Every counted run is identical.
- Each footing has a rectangular cross-section.
- Dimensions come from a valid project specification.
- Waste applies uniformly to the combined volume.
Mistakes to avoid
- Using total combined length and also entering multiple runs.
- Entering a fractional footing count.
- Using this volume result to select structural dimensions.
- Including round piers as rectangular footings.
Handle unusual pours explicitly.
Enter its total run length and a count of 1.
Calculate each identical group separately and add the order volumes.
They require cylinder volume and are outside this rectangular-run model.
What this estimate does not decide.
This is not structural or geotechnical design. It excludes soil bearing, frost depth, loads, settlement, reinforcement, code, excavation, keyways, piers, stepped geometry, forms, and inspection requirements.
Concrete planning questions.
What does footing count multiply?
It multiplies the complete rectangular run described by the entered length, width, and depth.
Can I use a combined length with count?
Use count 1 if length already combines all identical runs; otherwise you would double-count volume.
Does this calculator size a safe footing?
No. It only estimates volume from dimensions supplied by a valid plan or qualified professional.
Can it calculate round pier footings?
No. Round piers need a cylinder-volume calculation.
How should I handle stepped footings?
Divide them into rectangular segments, avoid overlaps, and calculate each segment group separately.