Inches to the fourth to millimeters to the fourth
Type a value in in⁴ to get it in mm⁴ instantly.
4.162×10¹¹mm⁴
That's 3.8× as stiff as a bridge girder — nothing on our list beats it. A solid square beam about 1,495 mm a side would be just as stiff.
Convert the other way: mm⁴ to in⁴
What it means
How stiff is that section?
This is the area moment, about a stated axis. It is not the mass moment of inertia, which has units of kg·m² and belongs to spinning things.
The math
How to convert in⁴ to mm⁴
To convert inches to the fourth to millimeters to the fourth, multiply by 416,231.
Example: 1,000,000 in⁴ × 416,231 = 4.162×10¹¹ mm⁴.
In the other direction, 1 mm⁴ = 2.403×10⁻⁶ in⁴.
Every unit
Your value in every unit
Tables
in⁴ to mm⁴ conversion table
| in⁴ | mm⁴ |
|---|---|
| 1,000 in⁴ | 416,231,000 mm⁴ |
| 10,000 in⁴ | 4.162×10⁹ mm⁴ |
| 100,000 in⁴ | 4.162×10¹⁰ mm⁴ |
| 1,000,000 in⁴ | 4.162×10¹¹ mm⁴ |
| 10,000,000 in⁴ | 4.162×10¹² mm⁴ |
| 100,000,000 in⁴ | 4.162×10¹³ mm⁴ |
| 1×10⁹ in⁴ | 4.162×10¹⁴ mm⁴ |
| 1×10¹⁰ in⁴ | 4.162×10¹⁵ mm⁴ |
mm⁴ to in⁴ conversion table
| mm⁴ | in⁴ |
|---|---|
| 1,000 mm⁴ | 0.00240251 in⁴ |
| 10,000 mm⁴ | 0.0240251 in⁴ |
| 100,000 mm⁴ | 0.240251 in⁴ |
| 1,000,000 mm⁴ | 2.40251 in⁴ |
| 10,000,000 mm⁴ | 24.0251 in⁴ |
| 100,000,000 mm⁴ | 240.251 in⁴ |
| 1×10⁹ mm⁴ | 2,402.51 in⁴ |
| 1×10¹⁰ mm⁴ | 24,025.1 in⁴ |
Quick answers
Quick answers
- How many mm⁴ is 1 in⁴?
- 1 in⁴ is 416,231 mm⁴.
- How many mm⁴ is 10 in⁴?
- 10 in⁴ is 4,162,310 mm⁴.
- How many mm⁴ is 1,000,000 in⁴?
- 1,000,000 in⁴ is 4.162×10¹¹ mm⁴.
The units
About these units
Inches to the fourth (in⁴)
The US unit. One in⁴ is 416,231 mm⁴.
Millimeters to the fourth (mm⁴)
The usual metric unit in structural software and drawings.
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