Density Converter
Convert density units instantly — kg/m³, g/cm³, g/mL, g/L, lb/ft³, lb/in³, lb/gal, slug/ft³, t/m³, and more. Includes a built-in material reference table for water, steel, gold, concrete, and other common substances. Free, private, and 100% client-side. No signup required.
Select your source and target density units, enter a value, and click Convert. Supports 12 units across SI metric and imperial systems. All conversions run instantly in your browser — no data sent to any server.
The most complete density converter online — covers all major SI metric and imperial units with context hints and a built-in material reference table.
Instant Density Conversion
Convert between kg/m³, g/cm³, g/mL, g/L, lb/ft³, lb/in³, lb/gal, slug/ft³, t/m³, and more in real time. Results appear the moment you click Convert — no page reload, no waiting.
Full Conversion Table & Material Reference
Expand the all-units table to see your input converted into every supported density unit at once. Use the material reference panel to instantly pre-fill densities for water, steel, gold, concrete, and more.
Secure Density Converter Online
Every density conversion runs entirely in your browser using client-side JavaScript. Your values never leave your device — complete privacy, zero server uploads, no tracking.
100% Free — No Signup Required
The density converter is completely free with no account, no ads, and no usage limits. Convert kg/m³ to g/cm³, lb/ft³ to kg/m³, or any combination as many times as you need.
See how scientists, engineers, students, and industry professionals use the density converter in their daily workflows.
Chemistry & Laboratory Science
Chemists convert between g/cm³, g/mL, and kg/m³ when working with material data sheets, solution preparation, and substance identification. The density converter handles all common lab units instantly.
Engineering & Materials Science
Mechanical and civil engineers convert between kg/m³, lb/ft³, and lb/in³ when selecting materials, calculating structural loads, and comparing international specifications. The density converter bridges SI and imperial standards.
Physics & Education
Students and teachers use the density converter to verify homework, understand the relationship between mass and volume, and compare densities of common materials like water (1,000 kg/m³) and gold (19,300 kg/m³).
Logistics & Bulk Material Handling
Freight and logistics professionals convert between t/m³ and lb/ft³ to calculate cargo weight, container capacity, and shipping costs for bulk materials like grain, sand, and aggregates.
Food Science & Brewing
Food scientists and brewers convert between g/mL, g/L, and lb/gal to measure ingredient densities, calculate specific gravity, and formulate recipes with precise mass-to-volume ratios.
Aerospace & Fluid Dynamics
Aerospace engineers use slug/ft³ and kg/m³ when calculating aerodynamic forces, buoyancy, and fluid flow. The density converter supports slug/ft³ alongside all standard SI and metric units.
A complete reference guide to density units, the formula behind density, and how different measurement systems express the same physical property.
What is Density?
Density is a physical property that describes how much mass is packed into a given volume. It is calculated using the formula: ρ = m / V, where ρ (rho) is density, m is mass, and V is volume. The SI base unit for density is kilogram per cubic meter (kg/m³). The density converter uses kg/m³ as the pivot unit — every input is first converted to kg/m³, then scaled to the target unit using a precise conversion factor.
How Our Density Converter Works
- 1Select your units: Choose the source unit (From) and the target unit (To) from the dropdowns. Context hints below each selector explain where each unit is commonly used.
- 2Enter your value: Type any positive density value, or use the material reference panel to pre-fill a known density (e.g. water = 1,000 kg/m³). Use the swap button to reverse the direction.
- 3Get your result instantly: Click Convert to see the converted value. Expand the all-units table to view the equivalent in every supported density unit simultaneously.
What Gets Converted
- SI Metric Units (kg/m³, g/cm³, g/mL, g/L, mg/mL, kg/L, t/m³): The international standard system. kg/m³ is the SI base unit. g/cm³ and g/mL are numerically identical (1 g/cm³ = 1,000 kg/m³) and widely used in chemistry.
- Imperial Units (lb/ft³, lb/in³, lb/gal, oz/in³): Used primarily in the United States for construction, manufacturing, and engineering. 1 lb/ft³ ≈ 16.018 kg/m³.
- Slug per Cubic Foot (slug/ft³): A derived imperial unit used in aerospace and fluid dynamics. 1 slug/ft³ ≈ 515.38 kg/m³.
SI Metric System
kg/m³ is the SI base unit. g/cm³ = 1,000 kg/m³. g/L = 1 kg/m³. Used globally in science, engineering, and most countries. Water at 4°C has a density of exactly 1,000 kg/m³ (1 g/cm³).
Imperial / US System
lb/ft³ is the most common imperial density unit. 1 lb/ft³ ≈ 16.018 kg/m³. lb/in³ is used for dense metals. Water ≈ 62.43 lb/ft³ or 8.34 lb/gal (US).
Density Formula
ρ = m / V. Density equals mass divided by volume. If you know any two of density, mass, and volume, you can calculate the third. The density converter handles the unit scaling automatically.
Common Material Densities (kg/m³)
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A density converter is a tool that converts a density measurement from one unit to another — for example, from kg/m³ to g/cm³, or from lb/ft³ to kg/m³. Our density converter supports 12 units across SI metric and imperial systems and runs entirely in your browser with no signup required.
To convert kg/m³ to g/cm³, divide the value by 1,000. For example, 1,000 kg/m³ ÷ 1,000 = 1 g/cm³. This is the density of water at 4°C. Enter your value in the density converter above, select kg/m³ as the source and g/cm³ as the target, and click Convert.
To convert g/cm³ to kg/m³, multiply the value by 1,000. For example, 7.874 g/cm³ × 1,000 = 7,874 kg/m³ (the density of iron). Use the density converter above to perform this conversion instantly for any value.
1 lb/ft³ = 16.0185 kg/m³. To convert lb/ft³ to kg/m³, multiply the value by 16.0185. For example, 62.43 lb/ft³ × 16.0185 ≈ 1,000 kg/m³ (the density of water). The density converter handles this calculation automatically.
Water at 4°C has a density of 1,000 kg/m³ = 1 g/cm³ = 1 g/mL = 1 kg/L = 62.43 lb/ft³ = 0.03613 lb/in³ = 8.345 lb/gal (US). Use the material reference panel in the density converter to pre-fill water's density and convert it to any unit instantly.
g/cm³ and g/mL are numerically identical — 1 g/cm³ = 1 g/mL. This is because 1 cubic centimeter (cm³) equals exactly 1 milliliter (mL) by definition. Both units are widely used in chemistry and are interchangeable in all density calculations.
A slug is an imperial unit of mass equal to approximately 14.594 kg. One slug/ft³ ≈ 515.38 kg/m³. This unit is used in aerospace engineering and fluid dynamics when working with the imperial system, particularly for calculating aerodynamic forces and buoyancy.
Yes, completely. All density conversions are performed locally in your web browser using client-side JavaScript. No values, inputs, or results are ever sent to any server. Your data stays entirely on your device.
Yes. The density converter is 100% free with no account registration, no payment, and no usage limits. Convert as many density values as you need, any time, on any device.