What is specific strength?

Specific strength is strength divided by density: σ/ρ. It indicates strength relative to material weight.

What units should I enter?

Enter strength and optional Young's modulus in MPa, and density in g/cm³.

Is Young's modulus required?

No. Strength and density are required; Young's modulus is optional and enables the specific modulus result.

What does the calculator return?

It returns specific strength in N·m/kg and kN·m/kg. If Young's modulus is entered, it also returns specific modulus in N·m/kg and MN·m/kg.

Can I control the displayed precision?

Yes. Set Decimal Places from 0 to 6; the default is 2.

Elysia Tools

Navigation

Math & Numbers

Specific Strength & Specific Modulus Calculator

Specific strength = σ/ρ and specific modulus = E/ρ (optional E). Enter strength in MPa and density in g/cm³; output in N·m/kg (also as kN·m/kg). The figure of merit for lightweight design — a material with high strength but high density (e.g. tungsten) often loses to a lighter alloy. Typical values: Ti-6Al-4V ≈ 210 kN·m/kg, Al 7075 ≈ 180, carbon steel ≈ 50–90, CFRP ≈ 1000+.

Execution

Run this tool

Fill in the form, run the tool, and review the result in one place.

Prepared example runs

Click an example to fill the form automatically. File inputs still need an upload.

2 examples

Ti-6Al-4V: σ=950 MPa, ρ=4.43 g/cm³, E=114000 → specific strength ≈ 214.4 kN·m/kg

Specific strength = σ/ρ = 950 × 1000 / 4.43 = 214446.7 N·m/kg = 214.45 kN·m/kg. Specific modulus = 114000 × 1000 / 4.43 = 25.73 × 10⁶ N·m/kg.

{"result":"Specific strength = σ/ρ = 950 MPa × 1000 / 4.43 g/cm³ = 214446.7 N·m/kg (214.45 kN·m/kg). Specific modulus = E/ρ = 114000 MPa × 1000 / 4.43 = 25733634.8 N·m/kg (25.73 MN·m/kg).","metadata":{"input":{"strength":950,"density":4.43,"youngsModulus":114000},"result":{"specificStrengthNmKg":214446.7,"specificStrengthkNmKg":214.45,"specificModulusNmKg":25733634.8,"specificModulusMNmKg":25.73}}}

Carbon steel vs aluminum: σ=400 MPa, ρ=7.85, no E → specific strength ≈ 50.96 kN·m/kg

Demonstrates why mild steel is a poor choice for lightweight design despite decent strength: σ/ρ = 400 × 1000 / 7.85 = 50955 N·m/kg, far below aluminum or titanium at similar strength.

{"result":"Specific strength = σ/ρ = 400 MPa × 1000 / 7.85 g/cm³ = 50955.4 N·m/kg (50.96 kN·m/kg).","metadata":{"input":{"strength":400,"density":7.85},"result":{"specificStrengthNmKg":50955.4,"specificStrengthkNmKg":50.96}}}

Inputs

Set the required fields, then run the tool.

4 options

SettingsAdjust formats, ranges, numbers, and modes.4

Strength σ (MPa)numberRequiredTensile or yield strength in MPa. E.g. Ti-6Al-4V ≈ 950, Al 7075-T6 ≈ 503, AISI 4340 ≈ 1280, carbon-fiber composite ≈ 1500.Density ρ (g/cm³)numberRequiredDensity in g/cm³. E.g. titanium ≈ 4.43, aluminum ≈ 2.81, steel ≈ 7.85, CFRP ≈ 1.5, tungsten ≈ 19.3.Young's Modulus E (MPa, optional)numberOptionalYoung's modulus in MPa. Optional — when given, specific modulus E/ρ is also reported. E.g. titanium ≈ 114000, aluminum ≈ 71700, steel ≈ 200000, CFRP ≈ 150000.Decimal PlacesnumberOptional

Result

Ready for a run

Run the tool to preview files, text, structured data, or streamed output here.

Samples

Specific Strength & Specific Modulus Calculator

Run this tool

Prepared example runs

Inputs

Result

Examples that match this tool

Continue with connected tools and hubs

Prepared example runs

Inputs

Result

Learn when to use this tool, what it supports, and how real users apply it.

Key facts

Overview

When to use

How it works

Use cases

Examples

1. Ti-6Al-4V specific strength and modulus

2. Carbon steel specific strength

FAQ

Web Image Processing Python Samples

Android Image Processing Java Samples

Android Image Processing Kotlin Samples

Web Image Processing Rust Samples

Absolute Value Calculator

Air Changes per Hour (ACH, n = Q/V)

Bearing Life L10 Calculator

Bolt Torque Clamp Force Calculator

Audio Encoding and Format Conversion Tools

Image Format Conversion and Animated Export Tools

JSON Interchange and Format Translation Tools

Color Space Conversion Tools for Web and Print