Calculator Inputs
Tip: Use the tool name for clear exports.
Example Data Table
| Tool | Supply | Voltage (V) | Power | Eff (%) | PF | Run Current (A) |
|---|---|---|---|---|---|---|
| Hedge Trimmer | AC 1φ | 230 | 600 W | 85 | 0.90 | 3.41 |
| Leaf Blower | AC 1φ | 120 | 1400 W | 82 | 0.95 | 14.96 |
| Water Pump | AC 1φ | 230 | 1.2 kW | 80 | 0.88 | 7.43 |
| Garden Shredder | AC 1φ | 230 | 2.0 kW | 85 | 0.90 | 11.30 |
| Battery Sprayer | DC | 18 | 120 W | 90 | — | 7.41 |
Example currents are illustrative and depend on real nameplate ratings.
Formula Used
Single-phase AC
I = P / (V × PF × η)
Use real power (watts). PF is power factor. η is efficiency as a decimal.
Three-phase AC
I = P / (√3 × V × PF × η)
Useful for larger shop or pump motors supporting garden systems.
DC tools
I = P / (V × η)
DC tools don’t use power factor in this simplified estimate.
Surge current is estimated as Istart = Irun × surge multiplier. Continuous sizing optionally uses Icont = 1.25 × Irun.
How to Use This Calculator
- Enter your tool name and choose AC or DC supply.
- Set voltage and power from the tool nameplate.
- Add efficiency and power factor for better accuracy.
- Choose a surge multiplier for motor starting conditions.
- Select continuous load if the tool runs for long periods.
- Enter cord length to get a wire gauge suggestion.
- Press Calculate to see results above the form.
- Use the CSV or PDF buttons to save your output.
Safety Notes
- Use grounded outlets and outdoor-rated cords for garden work.
- Avoid long, thin cords that cause voltage drop and heating.
- Breakers protect wiring; tool manuals may specify requirements.
- If your tool trips breakers often, check wiring and startup load.