A typical shop vac uses 6 to 12 amps on standard 120V household circuits.
A shop vac's amperage depends on motor size and power. Most models draw 6-12 amps at 120V, with smaller units near 5 amps and heavy-duty versions reaching 12+ amps. Always check the label or manual for exact specs, as amperage affects circuit load and extension cord safety.
Key Factors Affecting Shop Vac Amperage
- Motor size: Larger motors (e.g., 5+ peak HP) draw more amps (10-12+).
- Voltage: Most run on 120V; commercial models may use 240V (halving amps for same wattage).
- Load: Clogs or blocked filters increase amp draw temporarily.
- Accessories: Attachments like power nozzles add minimal amperage (0.5-1 amp).
Amperage by Shop Vac Size (Estimates)
| Shop Vac Size (Peak HP) | Typical Amps (120V) | Wattage Range | Best For |
|---|---|---|---|
| 1-2 HP | 5-7 amps | 600-800W | Light cleanup, small workshops |
| 3-5 HP | 8-10 amps | 900-1,200W | Medium debris, garages |
| 6+ HP | 10-14 amps | 1,200-1,600W | Heavy-duty, construction sites |
How to Check Your Shop Vac's Amperage
- Label: Look for a metal plate or sticker (usually near the power cord).
- Manual: Search for "electrical specifications" or "power requirements."
- Multimeter: Set to measure amps, plug in the vac, and record the draw (use caution).
- Online specs: Search the model number + "amperage" for manufacturer data.
Safety Tips for High-Amp Shop Vacs
- Use a 14-12 AWG extension cord for 10+ amp models (shorter = better).
- Avoid sharing circuits with other high-draw tools (e.g., table saws).
- Check for GFCI protection if using outdoors or near water.
- Unplug before clearing clogs-motor strain can spike amperage dangerously.
Amps vs. Watts vs. Volts: Quick Conversion
Use this formula to calculate missing values:
Amps = Watts ÷ Volts
Example: A 1,200W shop vac on 120V draws 10 amps (1,200 ÷ 120).