Millimeters per second to vibration decibels
Type a value in mm/s to get it in VdB instantly.
128.9VdB
That's about the same as a machine at the usual alarm point. That is satisfactory: acceptable for unrestricted long-term running.
Convert the other way: VdB to mm/s
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 mm/s to VdB
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 mm/s = 128.943 VdB.
Every unit
Your vibration in every unit
Tables
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 |
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 |
Quick answers
Quick answers
- How many VdB is 1 mm/s?
- 1 mm/s is 120 VdB.
- How many VdB is 10 mm/s?
- 10 mm/s is 140 VdB.
- How many VdB is 2.8 mm/s?
- 2.8 mm/s is 128.943 VdB.
The units
About these units
Millimeters per second (mm/s)
The ISO standard for vibration severity, measured as RMS velocity.
Vibration decibels (VdB)
A logarithmic scale referred to 1 nm/s, used in building and ground vibration.
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