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Concrete Calculator

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Home, Trade & Construction

Concrete Calculator

Live answer1.63 yd³12 ft × 10 ft × 4 in × 1 pour(s) = 40 ft³ (1.481 yd³) base · plus 10% = 44 ft³ · 1.246 m³ · about 74 bag(s) at 0.6 ft³/bag
Live result1.63 yd³12 ft × 10 ft × 4 in × 1 pour(s) = 40 ft³ (1.481 yd³) base · plus 10% = 44 ft³ · 1.246 m³ · about 74 bag(s) at 0.6 ft³/bag
Formula used

Thickness feet = thickness inches ÷ 12. Base cubic feet = length × width × thickness feet × matching pours. Base cubic yards = base cubic feet ÷ 27. Order cubic yards = base cubic yards × (1 + overage percent ÷ 100). Cubic metres = order cubic yards × 0.764554857984. Bags needed = ceiling(order cubic feet ÷ bag yield). Optional ready-mix cost = order cubic yards × price per cubic yard.

This is the method behind the answer, so the result can be checked rather than simply trusted.

Live math canvas

Your numbers, formula and explanation together

Concrete Calculator: 1.63 yd³. 12 ft × 10 ft × 4 in × 1 pour(s) = 40 ft³ (1.481 yd³) base · plus 10% = 44 ft³ · 1.246 m³ · about 74 bag(s) at 0.6 ft³/bag

Formula applied

The exact method behind this answer

CalculationTime keeps the method visible so the number can be checked instead of blindly trusted.

Thickness feet = thickness inches ÷ 12. Base cubic feet = length × width × thickness feet × matching pours. Base cubic yards = base cubic feet ÷ 27. Order cubic yards = base cubic yards × (1 + overage percent ÷ 100). Cubic metres = order cubic yards × 0.764554857984. Bags needed = ceiling(order cubic feet ÷ bag yield). Optional ready-mix cost = order cubic yards × price per cubic yard.
  1. Apply the formulaThickness feet = thickness inches ÷ 12. Base cubic feet = length × width × thickness feet × matching pours. Base cubic yards = base cubic feet ÷ 27. Order cubic yards = base cubic yards × (1 + overage percent ÷ 100). Cubic metres = order cubic yards × 0.764554857984. Bags needed = ceiling(order cubic feet ÷ bag yield). Optional ready-mix cost = order cubic yards × price per cubic yard.1.63 yd³12 ft × 10 ft × 4 in × 1 pour(s) = 40 ft³ (1.481 yd³) base · plus 10% = 44 ft³ · 1.246 m³ · about 74 bag(s) at 0.6 ft³/bag

Your live breakdown

Current inputs in the calculation

These values come from the controls above and update when the calculator changes.

Pour length
12 ft
Measure the slab, path, pad or rectangular pour length in feet.
Pour width
10 ft
Measure the second side of the concrete area in feet.
Thickness
4 in
Enter the planned concrete thickness in inches. Common small slabs often use 4 inches, but structural needs vary.
Matching pours
1
Use this for repeated pads, bays, steps or matching rectangular sections.
Overage / waste allowance
10 %
A visible allowance helps cover uneven subgrade, small form errors, spillage and ordering margin.
Bag yield
0.6 ft³/bag
Optional bag yield from the product label. Many 80 lb bags yield about 0.6 ft³, but labels vary.
Optional ready-mix price
0 $/yd³
Optional rough material-price check. Delivery minimums, pump fees, reinforcement and labour are not included.

Resulting answer

1.63 yd³

12 ft × 10 ft × 4 in × 1 pour(s) = 40 ft³ (1.481 yd³) base · plus 10% = 44 ft³ · 1.246 m³ · about 74 bag(s) at 0.6 ft³/bag

Answer
1.63 yd³
Live support
12 ft × 10 ft × 4 in × 1 pour(s) = 40 ft³ (1.481 yd³) base · plus 10% = 44 ft³ · 1.246 m³ · about 74 bag(s) at 0.6 ft³/bag

Assumptions used

What this answer assumes

Best for homeowner slab planning, small pads, paths, shed bases, quote notes, supplier calls and classroom trade-math examples where dimensions, thickness and overage need a printable paper trail.

  • The calculator treats each pour as a rectangular prism. Split L-shaped or irregular pours into separate rectangles before adding them together.
  • Thickness is converted from inches to feet before volume is calculated.
  • Cubic yards use the exact relationship 1 cubic yard = 27 cubic feet.
  • Bag count is rounded up because dry concrete mix is normally bought in whole bags.
  • This is a quantity estimate, not a structural design, code-compliance, reinforcement, subgrade, curing, slump, delivery or safety assessment.

Master’s Tip

How to use the result well

Master’s Tip: print the base volume and order volume separately. A quote note that only says “1.63 yd³” is hard to audit unless the dimensions, thickness, overage and bag-yield assumptions stay attached.

Printable record

What belongs in the saved calculation

Save the inputs, result, formula, assumptions, page URL and date together so the calculation can be reviewed later.

Pour length
12 ft
Measure the slab, path, pad or rectangular pour length in feet.
Pour width
10 ft
Measure the second side of the concrete area in feet.
Thickness
4 in
Enter the planned concrete thickness in inches. Common small slabs often use 4 inches, but structural needs vary.
Matching pours
1
Use this for repeated pads, bays, steps or matching rectangular sections.

Visual grid

This result measures part of the space you live in

Length, area, volume and material estimates are grid problems too: measure the space, account for edges and allowances, then turn the pattern into a number you can use.

Micro-timehours, minutes, shiftsHuman scaledays, weeks, projectsMacro-timemonths, years, calendars
Measured output1.63 yd³

Space calculations turn a real surface, room, run or volume into cells, edges and allowances that can be quoted, ordered or checked.

CalculationTime

Concrete Calculation Report

Report date:

1.63 yd³12 ft × 10 ft × 4 in × 1 pour(s) = 40 ft³ (1.481 yd³) base · plus 10% = 44 ft³ · 1.246 m³ · about 74 bag(s) at 0.6 ft³/bag

Inputs

Pour length
12 ft
Pour width
10 ft
Thickness
4 in
Matching pours
1
Overage / waste allowance
10 %
Bag yield
0.6 ft³/bag
Optional ready-mix price
0 $/yd³

Method

Thickness feet = thickness inches ÷ 12. Base cubic feet = length × width × thickness feet × matching pours. Base cubic yards = base cubic feet ÷ 27. Order cubic yards = base cubic yards × (1 + overage percent ÷ 100). Cubic metres = order cubic yards × 0.764554857984. Bags needed = ceiling(order cubic feet ÷ bag yield). Optional ready-mix cost = order cubic yards × price per cubic yard.

  1. For a 12 ft × 10 ft slab at 4 in thick, thickness = 4 ÷ 12 = 0.3333 ft. Base volume = 12 × 10 × 0.3333 = 40 ft³, or 1.4815 yd³. With 10% overage, order volume is about 1.63 yd³.

Assumptions

  • The calculator treats each pour as a rectangular prism. Split L-shaped or irregular pours into separate rectangles before adding them together.
  • Thickness is converted from inches to feet before volume is calculated.
  • Cubic yards use the exact relationship 1 cubic yard = 27 cubic feet.
  • Bag count is rounded up because dry concrete mix is normally bought in whole bags.

Notes

Use this space on the printed report for client, supplier, classroom, job-location, measurement, quote or approval notes.

Source: https://www.calculationtime.com/calculators/concrete-calculator

This report shows the calculation inputs, formula, assumptions and result for review. It is not legal, payroll, tax, engineering, financial or academic advice unless a qualified professional confirms the applicable rules.