Disclaimer
Last updated: January 2026
What the calculators are good for
- Estimating how many cubic yards of mulch, soil, gravel, or sand to order
- Approximating refrigerator, freezer, oven, or microwave capacity
- Sizing a moving truck or storage unit
- Planning a garden bed, raised bed, or backyard pond
- Comparing shipping volume between carriers
- Learning how cubic feet math works
- Cross-checking a contractor\u2019s quoted material total
What the calculators are not good for
Do not rely solely on outputs from this site for any of the following uses. Consult a licensed professional in the relevant field:
- Structural engineering. Load-bearing capacities, structural concrete pours, foundation specifications, and any work that requires a stamped drawing.
- Regulatory filings. Building permits, septic system sizing, stormwater calculations, environmental impact statements, fire-code occupancy.
- Chemical and pharmaceutical work. Reagent dosing, batch sizing, drug compounding, or anything where small volume errors have safety consequences.
- Aerospace, automotive, or marine engineering. Fuel tank sizing, ballast calculations, pressure vessel design.
- Medical applications. Lung volume, blood volume, or any clinical measurement.
- Legal or insurance proceedings. Damage claims, contract disputes, surveying evidence.
Sources of error
Even when the math is exact, real-world cubic feet calculations include several sources of error:
- Measurement error. A 1% error in length compounds across L × W × H to roughly 3% in volume.
- Material density variation. Soil, mulch, gravel, and concrete densities vary with moisture, compaction, and source. We use industry averages.
- Container shape approximation. Real boxes have rounded corners, real tanks have dished heads, real rooms have soffits and built-ins.
- Settling and compaction. Loose mulch settles 20–30%. Loose soil compacts as it absorbs water. Order extra.
- Temperature and pressure. Air, water, and gas volumes change with temperature. Most calculators assume standard conditions.
Material density assumptions
Where the calculators estimate weight or material quantity, we use commonly cited industry averages:
- Water: 62.43 lb/ft³ (fresh, 39 °F)
- Concrete (cured): 150 lb/ft³
- Topsoil (loose): 75 lb/ft³
- Mulch (bark): 18 lb/ft³
- Gravel: 105 lb/ft³
- Sand (dry): 100 lb/ft³
- Pine (dry): 30 lb/ft³
- Oak (seasoned): 47 lb/ft³
Your specific batch may differ by 10–20%. Bagged products list exact weight on the package; trust the label over our estimate.
Conversion factor accuracy
Length and volume conversion factors are accurate to at least five significant figures. Where exact values exist (1 ft = 0.3048 m by definition; 1 US gallon = 231 in³ exactly), we use them. Rounding in display occurs only after the calculation.
Liability
By using the site you accept full responsibility for how you apply the results. CalculateCubicFeet, its operators, and contributors are not liable for any loss, damage, expense, or claim arising from use of the calculators or content. See our terms of service for the full liability terms.
Affiliate disclosure
CalculateCubicFeet may earn a small commission if you click through to a partner retailer and make a purchase. This does not affect the cubic feet math, the conversion factors, or our calculator recommendations. We never accept payment to alter calculator outputs or to feature one supplier over another.
External resources
Where we link to external resources (manufacturer spec sheets, government density tables, university course material), we believe those sources to be accurate at the time of linking. We do not control external content and cannot guarantee its ongoing availability or accuracy.
Contact
If you spot an error or have a question about the assumptions in any calculator, please email hello@calculatecubicfeet.com or use the contact page.