Volume conversions are useful only when both sides mean the same physical quantity. The Whatson Construction Volume Converter changes units; it does not add wastage, allow for compaction or estimate material weight.
A measured 100 cft remains the same volume whether displayed as cubic metres or litres. A loose sand delivery may represent a different volume for other reasons, which need a separate calculation.
A 100 cft conversion you can check
Enter 100 and choose cubic feet as the source unit. The checked outputs include:
| Target unit | Converted volume |
|---|---|
| Cubic metres | 2.8317 m³ |
| Litres | 2,831.6847 |
| Cubic yards | 3.7037 |
| Imperial gallons | 622.8835 |
| US gallons | 748.0519 |
The displayed values are rounded. Internally, one cubic foot is 0.028316846592 m³, derived from the international foot length of 0.3048 m.
NIST’s volume conversion table provides the unit reference, including the distinct US and Imperial gallon definitions.
A gallon needs its full name
An Imperial gallon and a US gallon are different volumes. A tank described only as “1,000 gallons” is ambiguous until the supplier states which gallon is intended.
The converter displays both. Do not pick the larger or smaller answer to suit a quote; identify the unit on the product or specification first.
What this tool deliberately does not infer
Cft is a volume, not a mass. Converting gravel from cft to tonnes requires a relevant bulk density. This converter has no density input, so it cannot answer that question.
Similarly, the loose material needed for a compacted fill may exceed the final measured space. Converting that final space from cft to m³ does not account for the difference. The Sand Filling Calculator separates final volume and delivered volume.
Check depth before converting a calculated box
If the original volume came from length × width × depth, those three dimensions must first be in compatible units. A depth accidentally entered as six feet instead of six inches is still wrong after a perfectly accurate volume conversion.
For concrete shapes, the Concrete Volume Calculator performs the geometry before showing both cft and m³. Use this converter when you already have a volume and need to compare a supplier’s unit or record it consistently.