Vibration decibels to millimeters per second
Type a value in VdB to get it in mm/s instantly.
Nothing on our list is smaller: a new precision machine is 507,105× rougher. That is in the good band: a machine in this state can run indefinitely.
Convert the other way: mm/s to VdB
What it means
How rough is that?
Severity bands follow ISO 10816 for medium machines. Large machines on flexible mounts are allowed considerably more.
The math
How to convert VdB to mm/s
Vibration decibels are logarithmic: VdB = 20 × log₁₀(velocity ÷ 1 nm/s), and back again velocity = 10^(VdB ÷ 20) nanometers per second. The rest are plain multiples.
Example: 2.8 VdB = 1.38×10⁻⁶ mm/s.
Every unit
Your vibration in every unit
Tables
VdB to mm/s conversion table
| VdB | mm/s |
|---|---|
| 0.28 VdB | 1.033×10⁻⁶ mm/s |
| 0.45 VdB | 1.053×10⁻⁶ mm/s |
| 0.71 VdB | 1.085×10⁻⁶ mm/s |
| 1.12 VdB | 1.138×10⁻⁶ mm/s |
| 1.8 VdB | 1.23×10⁻⁶ mm/s |
| 2.8 VdB | 1.38×10⁻⁶ mm/s |
| 4.5 VdB | 1.679×10⁻⁶ mm/s |
| 7.1 VdB | 2.265×10⁻⁶ mm/s |
| 11.2 VdB | 3.631×10⁻⁶ mm/s |
| 18 VdB | 7.943×10⁻⁶ mm/s |
| 28 VdB | 2.512×10⁻⁵ mm/s |
| 45 VdB | 0.000177828 mm/s |
mm/s to VdB conversion table
| mm/s | VdB |
|---|---|
| 0.28 mm/s | 108.943 VdB |
| 0.45 mm/s | 113.064 VdB |
| 0.71 mm/s | 117.025 VdB |
| 1.12 mm/s | 120.984 VdB |
| 1.8 mm/s | 125.105 VdB |
| 2.8 mm/s | 128.943 VdB |
| 4.5 mm/s | 133.064 VdB |
| 7.1 mm/s | 137.025 VdB |
| 11.2 mm/s | 140.984 VdB |
| 18 mm/s | 145.105 VdB |
| 28 mm/s | 148.943 VdB |
| 45 mm/s | 153.064 VdB |
Quick answers
Quick answers
- How many mm/s is 1 VdB?
- 1 VdB is 1.122×10⁻⁶ mm/s.
- How many mm/s is 10 VdB?
- 10 VdB is 3.162×10⁻⁶ mm/s.
- How many mm/s is 2.8 VdB?
- 2.8 VdB is 1.38×10⁻⁶ mm/s.
The units
About these units
Vibration decibels (VdB)
A logarithmic scale referred to 1 nm/s, used in building and ground vibration.
Millimeters per second (mm/s)
The ISO standard for vibration severity, measured as RMS velocity.
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