SettingsSettings for this calculationUS
The unit weight in pounds per cubic foot.
Take the figure from the line your specification names. Compaction is written against a maximum dry density, so a field sheet's wet density is the wrong number to convert even though it is the larger and more prominent one on the page. For concrete, 145 pcf is the usual plain-concrete value and 150 pcf the one used once reinforcement is included.
Density
1,922 kg/m³
Converted using an exact defined factor of 16.018463374 kg/m³ per lb/ft³. Fixed by definition, so any error will lie in which density the field sheet gave you rather than in the conversion.
- Conversion factor applied
- 16.02 kg/m³ per lb/ft³
They open the calculator with your figures already in it
pcf to kg/m³ Calculator: 1,922 kg/m³ — shown in imperial, US market. The link sets both, so the result they see is the one on your screen.
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How this was calculated
Formula source(s)
- A pound in a cubic foot, expressed in metric: 0.45359237 kg divided by 0.028316846592 m³ gives 16.018463373960139579… kg/m³. Both constants are definitions, so the ratio is exact even though its decimal never closes.
Inputs used
- Unit weight (lb/ft³)
- 120
Intermediate steps
- Conversion factor applied
- 16.02 kg/m³ per lb/ft³
Confidence note: Converted using an exact defined factor of 16.018463374 kg/m³ per lb/ft³. Fixed by definition, so any error will lie in which density the field sheet gave you rather than in the conversion.
Add the equipment this sizes
This result is a specification — 1,922 kg/m³ — not a quantity. Put the thing it sizes into your project: how many, what you call it, and your supplier’s price.
Computed in your browser — nothing you enter is uploaded. Presented in US customary units and US trade terminology. Where a formula follows a published standard, that standard and its edition are cited beside it on this page; where none governs, the page says so. Local amendments override model codes — verify against the code in force where you build.
Sources checked 2026-08-26 · in the site-wide review of 2026-09-06 · v1.0.0
Regulatory standards & verification citations1
- A pound in a cubic foot, expressed in metric: 0.45359237 kg divided by 0.028316846592 m³ gives 16.018463373960139579… kg/m³. Both constants are definitions, so the ratio is exact even though its decimal never closes.
Cite this page
Your workspace
Most jobs need more than one number. Add the calculators you need next and they open right here, underneath this one — your figures stay on screen and nothing is lost to a page change.
Earthworks paperwork is where this direction lives. A nuclear gauge printout or a Proctor curve reports pounds per cubic foot, while the settlement model, the compaction clause or the client sits in metric. Field sheets carry three densities together — wet, dry and maximum dry — and choosing the wrong line costs far more than any rounding afterwards, so convert the one your specification is actually written against. Mind the destination unit as well: geotechnical work outside North America is usually quoted in Mg/m³ or g/cm³, which is this result divided by a thousand, making 120 pcf read as 1.9222 Mg/m³. And 100 pcf is 1601.85 kg/m³, never the tidy 1600 that ends up in the report.