CalculationTime

Cubic Feet to Cubic Yards Calculator

Convert cubic feet to cubic yards for concrete, mulch, gravel, soil, shipping or classroom volume notes, with allowance, cubic-metre cross-checks and a printable job record.

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Your numbers, formula and explanation together

Cubic Feet to Cubic Yards Calculator: 3 cu yd. 81 cu ft ÷ 27 = 3 cu yd exact · 2.293665 m³ · order volume 3.3 cu yd with 10% allowance

Formula applied

The exact method behind this answer

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

Cubic yards = cubic feet ÷ 27. Cubic metres = cubic feet × 0.028316846592. Order cubic yards = cubic yards × (1 + allowance percent ÷ 100). Optional estimated cost = order cubic yards × price per cubic yard.
  1. Apply the formulaCubic yards = cubic feet ÷ 27. Cubic metres = cubic feet × 0.028316846592. Order cubic yards = cubic yards × (1 + allowance percent ÷ 100). Optional estimated cost = order cubic yards × price per cubic yard.3 cu yd81 cu ft ÷ 27 = 3 cu yd exact · 2.293665 m³ · order volume 3.3 cu yd with 10% allowance

Your live breakdown

Current inputs in the calculation

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

Volume
81 cu ft
Enter the measured volume in cubic feet.
Waste / allowance
10 %
Optional allowance for compaction, spillage, form variation, cuts or ordering safety.
Yard rounding increment
0.01 cu yd
Use 0.01 for worksheets, 0.1 for rough quote notes, or 0.25 when a supplier orders in quarter-yard steps.
Optional unit price
0 per cu yd
Optional price per cubic yard for a quick material quote note before delivery, minimum-load fees or tax.

Resulting answer

3 cu yd

81 cu ft ÷ 27 = 3 cu yd exact · 2.293665 m³ · order volume 3.3 cu yd with 10% allowance

Answer
3 cu yd
Live support
81 cu ft ÷ 27 = 3 cu yd exact · 2.293665 m³ · order volume 3.3 cu yd with 10% allowance

Assumptions used

What this answer assumes

Best for concrete, mulch, gravel, soil, landscape materials, shipping volumes and classroom volume worksheets where the conversion and ordering allowance should stay visible.

  • The input is already a volume in cubic feet, not a length, area or depth measurement.
  • The conversion uses 1 cubic yard = 27 cubic feet because 1 yard = 3 feet and 3 × 3 × 3 = 27.
  • The cubic-metre cross-check uses the international-foot basis: 1 cubic foot = 0.028316846592 cubic metres.
  • Allowance is shown separately from measured volume so ordering judgement does not hide inside the unit conversion.
  • Supplier rules, compaction, moisture, truck minimums, bag yields, tax, delivery charges and local construction requirements may change the final order.

Master’s Tip

How to use the result well

Master’s Tip: convert the measured volume first, then add allowance as a separate line. That makes a quote note easier to audit when concrete, mulch, gravel or soil quantities are rounded to supplier ordering increments.

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.

Volume
81 cu ft
Enter the measured volume in cubic feet.
Waste / allowance
10 %
Optional allowance for compaction, spillage, form variation, cuts or ordering safety.
Yard rounding increment
0.01 cu yd
Use 0.01 for worksheets, 0.1 for rough quote notes, or 0.25 when a supplier orders in quarter-yard steps.
Optional unit price
0 per cu yd
Optional price per cubic yard for a quick material quote note before delivery, minimum-load fees or tax.

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Formula

Cubic yards = cubic feet ÷ 27. Cubic metres = cubic feet × 0.028316846592. Order cubic yards = cubic yards × (1 + allowance percent ÷ 100). Optional estimated cost = order cubic yards × price per cubic yard.

Worked example

For 81 cubic feet, cubic yards = 81 ÷ 27 = 3.0000 cu yd. With a 10% allowance, order volume = 3 × 1.10 = 3.3000 cu yd. The metric cross-check is 81 × 0.028316846592 = 2.2927 m³ before allowance.

Professional note

Master’s Tip: convert the measured volume first, then add allowance as a separate line. That makes a quote note easier to audit when concrete, mulch, gravel or soil quantities are rounded to supplier ordering increments.

Regional and unit assumptions

Standard or basis: international-foot volume conversion where 1 cubic yard = 27 cubic feet and 1 cubic foot = 0.028316846592 cubic metres. This is a measurement, quote-note and worksheet calculator, not a supplier quote, engineering approval or compaction guarantee.

Assumptions and limitations

Methodology & Accuracy

How this calculator is checked

CalculationTime pages are built around visible arithmetic: the formula, assumptions, worked example and practical limitations are shown so the result can be checked rather than simply trusted.

Formula used

Cubic yards = cubic feet ÷ 27. Cubic metres = cubic feet × 0.028316846592. Order cubic yards = cubic yards × (1 + allowance percent ÷ 100). Optional estimated cost = order cubic yards × price per cubic yard.

Standard or basis

Standard or basis: international-foot volume conversion where 1 cubic yard = 27 cubic feet and 1 cubic foot = 0.028316846592 cubic metres. This is a measurement, quote-note and worksheet calculator, not a supplier quote, engineering approval or compaction guarantee.

Where a calculator follows a named legal, trade or industry standard, that standard is cited visibly. Otherwise the page uses transparent general arithmetic and states its limits.

Master's Tip

Master’s Tip: convert the measured volume first, then add allowance as a separate line. That makes a quote note easier to audit when concrete, mulch, gravel or soil quantities are rounded to supplier ordering increments.

Related calculators

These cards are resolved from calculator data, category context and live-route status so the page links to useful next steps without hand-built link clutter.

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Questions

How do I convert cubic feet to cubic yards?

Divide cubic feet by 27. A cubic yard is 3 ft × 3 ft × 3 ft, so it contains 27 cubic feet.

How many cubic yards is 81 cubic feet?

81 cubic feet is 3 cubic yards because 81 ÷ 27 = 3.

Should I add waste before or after converting to cubic yards?

Either order gives the same arithmetic if the percentage is the same, but it is clearer to convert the measured volume first and show allowance as a separate line.

Is cubic yards the same as yards?

No. Cubic yards measure volume. Yards measure length. A cubic yard is a three-dimensional volume equal to 27 cubic feet.

What should I print for a cubic-foot to cubic-yard record?

Print the cubic-foot input, cubic-yard result, allowance, rounding basis, cubic-metre cross-check, optional price, formula, assumptions, page URL, date and job notes.

Calculation note

Cubic-foot to cubic-yard conversion is a volume bridge between small measured dimensions and larger material ordering units. It is especially common when a job is measured in feet but quoted by the cubic yard.

A cubic yard is a three-foot cube

Because one yard equals three feet, a cube that is one yard wide, one yard long and one yard high contains 3 × 3 × 3 cubic feet. That is why the conversion divisor is 27.

Material orders need an audit trail

Concrete, soil, mulch and gravel are often measured from dimensions but ordered in cubic yards. A useful record keeps measured volume, allowance and supplier rounding separate.

Metric cross-checks reduce handoff mistakes

Showing cubic metres beside cubic yards helps when drawings, suppliers or classrooms use SI units. The cross-check should be labelled as a conversion, not a different measurement.

Sources and further readingNIST — U.S. Survey Foot: Revised Unit Conversion FactorsBIPM — The International System of Units (SI)Encyclopaedia Britannica — Volume