Density Converter
Milligram per Cubic Meter
mg/m³
Milligram per Liter
mg/L
Gram per Liter
g/L
Kilogram per Cubic Meter
kg/m³
Gram per Cubic Centimeter
g/cm³
Kilogram per Liter
kg/L
Tonne per Cubic Meter
t/m³
Ounce per Cubic Foot
oz/ft³
Pound per Cubic Foot
lb/ft³
Pound per US Gallon
lb/gal
Ounce per Cubic Inch
oz/in³
Pound per Cubic Inch
lb/in³
Ounce per Imperial Gallon
oz/gal UK
Pound per Imperial Gallon
lb/gal UK
Slug per Cubic Foot
slug/ft³
Hover any row to copy the value or use it as the new input.
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A comprehensive density converter covering 15 units across three systems - all results shown simultaneously. SI / Metric covers milligram per cubic meter, milligram per liter, gram per liter, kilogram per cubic meter (the SI base unit), gram per cubic centimeter, kilogram per liter, and tonne per cubic meter - the units used in physics, chemistry, food science, and engineering specifications. US Customary covers ounce per cubic foot, pound per cubic foot, pound per US gallon, ounce per cubic inch, and pound per cubic inch - the units used in construction, HVAC, fuel density, and materials engineering in the United States. Imperial covers ounce per imperial gallon, pound per imperial gallon, and slug per cubic foot - the units used in UK engineering, fluid mechanics, and classical dynamics. Type a value, pick a unit, and every other unit updates instantly. Click any result row to reverse the conversion. The quick-reference table includes common material densities (water, air, seawater, aluminum, steel, lead, gold) alongside key unit conversion factors. Adjustable significant figures and scientific notation toggle included. 100% browser-based - your data never leaves your device.
How to Use
- 1Type a density value in the input field
- 2Select your starting unit from the From dropdown - choose from SI / Metric, US Customary, or Imperial
- 3Select your target unit from the To dropdown - the result appears instantly
- 4All 15 conversions appear simultaneously, grouped by unit system
- 5Hover any result row to reveal the copy (📋) and use-as-input (⇅) buttons
- 6Click the copy icon to copy a value to your clipboard
- 7Click ⇅ on any row to use that unit and value as the new input for instant reverse conversion
- 8Use the ⇄ button between From and To to swap both units while updating the value
- 9Adjust 'Sig. figures' to control result precision (3 to 12 significant digits)
- 10Toggle 'Sci notation' for very small values such as mg/m³ or very large values such as lb/in³
- 11Collapse a group by clicking its header to reduce clutter when you only need one unit system
- 12Open 'Common conversions & material densities' at the bottom for a quick-reference table with real-world material densities
Features
- 15 density units across 3 unit systems
- SI / Metric: mg/m³, mg/L, g/L, kg/m³ (SI base), g/cm³, kg/L, t/m³
- US Customary: oz/ft³, lb/ft³, lb/gal (US), oz/in³, lb/in³
- Imperial: oz/gal (UK), lb/gal (UK), slug/ft³
- All 15 conversions shown simultaneously - no need to select a single target unit
- Click any result row to use it as the new input for instant reverse conversion
- Adjustable significant figures: 3, 4, 5, 6, 8, 10, or 12 digits
- Toggleable scientific notation for very small (mg/m³) or very large (lb/in³) values
- Collapsible unit-system groups to reduce visual clutter
- One-click copy to clipboard for any converted value
- Quick-reference table with 7 common material densities (water, air, seawater, aluminum, steel, lead, gold) and 5 key unit conversions
- Exact factors: 1 lb = 0.45359237 kg, 1 ft³ = 0.028316846592 m³, 1 US gal = 3.785411784 L (all NIST-traceable)
- Default: 1 g/cm³ → kg/m³ (the most common material science conversion)
- 100% browser-based - no server, no data upload
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