Density Calculator
Calculate density from mass and volume using common lab and imperial units. Results include kg/m^3, g/cm^3, g/mL, kg/L, lb/ft^3, lb/in^3, and an approximate comparison with water.
Formula
rho = m / V
Mass
kg, g, mg, lb, oz
Volume
m^3, L, mL, cm^3
Live calculator
Mass and volume input
Density
2.5 g/cm^3
SI density
2.5K kg/m^3
Mass
0.025 kg
Volume
1.000e-5 m^3
| g/mL | 2.5 g/mL |
|---|---|
| kg/L | 2.5 kg/L |
| lb/ft^3 | 156.069902 lb/ft^3 |
| lb/in^3 | 0.090318 lb/in^3 |
| Compared with water | 2.507523xThis density is greater than the approximate density of water at room temperature. |
Formula check
Density equals mass divided by volume: rho = m / V. Volume must be positive, and the calculator normalizes values to kilograms and cubic meters before converting the result.
Convert mass and volume into density rows
Mass normalization
Convert kilograms, grams, milligrams, pounds, and ounces to a common kilogram basis.
Volume normalization
Convert liters, milliliters, cubic centimeters, cubic feet, cubic inches, and gallons.
Density table
Compare kg/m^3, g/cm^3, g/mL, kg/L, lb/ft^3, and lb/in^3 from the same sample.
Density formulas used on this page
Density is mass per unit volume. The calculator normalizes mass and volume before converting the density result into common reporting units.
Working formulas
Density
rho = m / V
Mass divided by volume gives density.
SI density
kg/m^3 = kilograms / cubic meters
All inputs are normalized to SI before conversion rows are generated.
Lab density
g/cm^3 = kg/m^3 / 1000
For water-like lab values, g/cm^3 and g/mL are numerically equivalent.
Symbols
- rho - density
- Mass per unit volume, shown in SI and common lab units.
- m - mass
- The sample mass, normalized to kilograms before calculation.
- V - volume
- The sample volume, normalized to cubic meters before calculation.
- kg/m^3 - SI density unit
- Kilograms per cubic meter, the normalized density basis.
Density output with lab and SI units side by side
Unit-aware density checks
- Mass and volume inputs are converted to kilograms and cubic meters before calculation.
- Results include both SI and common lab-density units for comparison.
- The water comparison uses an approximate room-temperature reference and is labeled as a rough check.
- Copy and print controls preserve the mass, volume, density, and unit labels together.
Lab-report context
- The formula section explains density as mass per unit volume.
- FAQ answers cover g/cm^3 vs g/mL, volume displacement, water comparisons, and significant figures.
- Related links connect density to percent error and significant-figure reporting.
- The page avoids material identification claims because real identification needs source data and context.
Density support for lab measurements
Students
Check lab-report arithmetic while keeping unit labels, accepted values, and rounding choices visible.
Lab classes
Create source-backed examples for density, percent error, and measurement precision discussions.
Report reviewers
Audit whether a result includes the formula, substitution, units, precision, and scope notes.
How it works in three quick steps.
Enter mass
Type the sample mass and choose kilograms, grams, milligrams, pounds, or ounces.
Enter volume
Type the sample volume and choose cubic meters, liters, milliliters, cubic centimeters, cubic feet, cubic inches, or US gallons.
Read density conversions
Review the SI density and common lab-density units before writing the result.
Save or print a density result
Copy the calculation
Copy the result with units and assumptions so it can be pasted into notes or a draft report.
Print the result
Print inputs, outputs, formula notes, FAQ answers, and related lab-calculation links.
Attach to a report
Use the formulas and table rows below the calculator to document the arithmetic clearly.
Why density pages need unit conversion tables
Density is a compact formula, but the reported unit changes how a result is read. A lab notebook may use grams and milliliters, a physics example may use kilograms and cubic meters, and a reference table may use g/cm^3. Toolarithm's Density Calculator normalizes the mass and volume first, then shows the same density in multiple units so the result can be compared without repeating the conversion by hand.
The page is built for educational lab-report calculations. It does not identify unknown materials, certify purity, or evaluate safety. Those tasks require reference data, temperature context, repeated measurements, instrument uncertainty, and procedural review. The calculator focuses on the arithmetic: mass divided by volume, clear units, conversion rows, and notes that help the result fit into a written report.
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