How to Use This Tool
Enter a Value
Type the density you want to convert into the input field. Decimals and scientific notation are supported.
Choose Your Units
Pick a From unit and a To unit from the dropdowns. Use the swap button to flip them instantly.
Read the Result
The converted value appears instantly below the inputs. Click Copy to put it on your clipboard.
Try Different Pairs
Change the From or To unit to convert between any of the 10 supported density units.
Frequently Asked Questions
Is this tool really free?
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Yes, completely free with no limits and no sign-up. Everything runs in your browser.
Is my data sent to a server?
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No. All conversion math happens directly in your browser. Nothing you type is ever sent anywhere.
What units are supported?
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10 units: kg/m3, g/cm3, g/mL, kg/L, lb/ft3, lb/in3, lb/US gallon, lb/Imperial gallon, oz/in3, and tonne/m3.
What is density?
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Density is mass per unit of volume. It tells you how heavy a material is for its size. Water has a density of 1 g/cm3 or 1000 kg/m3.
What is the difference between g/cm3 and g/mL?
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They are numerically identical. 1 cm3 of volume equals 1 mL, so the density value is the same in both units.
What is the difference between kg/L and g/cm3?
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They are also numerically identical. 1 kg/L = 1 g/cm3 = 1000 kg/m3.
What is lb/ft3 used for?
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Pounds per cubic foot is a common density unit in US engineering, construction, and material science.
Why are there both US and Imperial gallon units?
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A US gallon is about 3.785 liters while an Imperial gallon is about 4.546 liters. The same material has a different lb/gallon value depending on which gallon you use.
How accurate are the conversions?
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The tool uses standard conversion factors and displays up to 10 significant figures. Results are accurate for everyday, educational, and professional use.
Does it update instantly?
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Yes. The result appears as soon as you type or change a unit. No button to click.
What Is Density Converter?
Density Converter is a free tool that converts between 10 density units right in your browser. It covers metric (kg/m3, g/cm3, g/mL, kg/L, tonne/m3), US customary (lb/ft3, lb/in3, lb/US gallon, oz/in3), and Imperial (lb/Imperial gallon) units. Nothing you type is ever sent anywhere - all math runs locally on your device.
The result updates live as you type. Use the swap button to flip your units instantly, or copy the result to your clipboard in one click. Perfect for material science, engineering, cooking, and any work involving mass and volume.
Features Explained
10 Density Units
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Convert between kg/m3, g/cm3, g/mL, kg/L, lb/ft3, lb/in3, lb/US gallon, lb/Imperial gallon, oz/in3, and tonne/m3.
Metric Units
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kg/m3 is the standard metric density unit. g/cm3, g/mL, and kg/L are all numerically equivalent and widely used in science and everyday life.
US Customary Units
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lb/ft3 for engineering and construction. lb/in3 for compact materials. lb/US gallon for liquids. oz/in3 for small items.
US vs Imperial Gallon
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Both lb/US gallon and lb/Imperial gallon are included because the gallon sizes differ, giving different density numbers for the same material.
Tonne per Cubic Meter
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Numerically equal to g/cm3 and kg/L. Convenient for large-scale industrial and geological measurements.
Instant Conversion
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The result updates live as you type. There is no Convert button to click - you see the answer the moment your input changes.
Swap Button
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Click the swap button between the From and To dropdowns to flip them instantly. The result recalculates right away.
Copy to Clipboard
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Click Copy to put the converted value on your clipboard instantly, ready to paste into a document, spreadsheet, or report.
Input Validation
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If you enter something that is not a valid number, the tool shows an error message instead of a wrong result.
100% Browser-Based
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All conversion math runs directly in your browser. Nothing you type is ever sent to any server - complete privacy.
Who Is This Tool For?
Chemical Engineers
Convert material densities between metric and US units for process design and fluid calculations.
Materials Scientists
Convert density data between units when comparing materials from different datasheets and publications.
Mechanical Engineers
Convert component and fluid densities between kg/m3, lb/ft3, and g/cm3 for design specifications.
Civil Engineers
Convert concrete, soil, and aggregate densities between metric and US customary units.
Geologists
Convert rock and mineral densities between g/cm3, kg/m3, and lb/ft3 for field and lab data.
Students
Convert density values for physics, chemistry, and engineering homework and lab reports.
Teachers
Demonstrate density conversions in real time during science lessons.
Brewers
Convert wort and beer density between metric and US units for recipe calculations.
Oil and Gas Workers
Convert crude oil and fluid densities between API-related units and metric for production data.
Pharmacists
Convert solution and compound densities between metric units for formulation.
Food Scientists
Convert ingredient and product densities between g/mL, kg/L, and lb/gallon.
Aquarium Hobbyists
Convert saltwater and freshwater density between g/cm3 and other units for tank management.
Pool Maintenance Workers
Convert chemical solution densities between metric and US units for treatment calculations.
Metalworkers
Convert metal densities between g/cm3, kg/m3, and lb/in3 for weight estimation.
Woodworkers
Convert wood density between kg/m3 and lb/ft3 when selecting and comparing lumber.
Aerospace Engineers
Convert fuel and material densities between metric and US units for aircraft design.
Environmental Scientists
Convert pollutant and water sample densities between units for regulatory reporting.
Cosmetics Formulators
Convert ingredient densities between g/mL and other units for product formulation.
3D Printing Users
Convert filament and resin densities between g/cm3 and kg/m3 for weight estimation.
Shipping Workers
Convert cargo density between kg/m3 and lb/ft3 for freight calculations.
Lab Technicians
Convert sample and reagent densities between the units used by different instruments.
Jewelers
Convert precious metal densities to verify authenticity and purity.
Researchers
Convert between SI and traditional density units for cross-referencing publications.
Anyone
Quickly convert any density value between 10 units for any reason.
Tips for Best Results
Water's density is the reference
Pure water at 4 degrees Celsius has a density of exactly 1 g/cm3, 1 g/mL, 1 kg/L, or 1000 kg/m3. Use this as a reference point.
g/cm3 = g/mL = kg/L
These three units are numerically identical. 1 g/cm3 = 1 g/mL = 1 kg/L = 1000 kg/m3. The tool confirms this.
US vs Imperial gallon matters
A US gallon is about 3.785 liters and an Imperial gallon is about 4.546 liters. The same liquid has different lb/gallon values depending on which gallon you use.
lb/ft3 for construction
Concrete is about 150 lb/ft3. Steel is about 490 lb/ft3. Wood ranges from 20 to 50 lb/ft3 depending on species.
Common material densities
Water = 1 g/cm3, aluminum = 2.7 g/cm3, steel = 7.8 g/cm3, gold = 19.3 g/cm3, air = about 0.0012 g/cm3.
Use the swap button
Click the swap button between the dropdowns to flip From and To instantly.
Copy the result in one click
Click Copy next to the result to put the value on your clipboard.
Decimals are fully supported
You can type values like 0.997, 7.874, or 2.5e3. The tool handles all standard number formats.
Results update instantly
Change any input and the result recalculates immediately. No button to click.
Privacy is built in
Nothing you type is ever sent to any server. All math runs in your browser.
Privacy & Security
This tool runs 100% in your browser. Your files stay entirely on your own device. Nothing is uploaded, nothing is shared, and no server, advertiser, or third party has access to your files.
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