Calculator Form
Example Data Table
| Equipment | Watts per Unit | Quantity | Total Watts | Total kW |
|---|---|---|---|---|
| LED Flood Light | 150 | 4 | 600 | 0.600 |
| Room Heater | 2000 | 1 | 2000 | 2.000 |
| Water Pump | 750 | 2 | 1500 | 1.500 |
| Office PCs | 300 | 8 | 2400 | 2.400 |
| Small Server Rack | 3200 | 1 | 3200 | 3.200 |
Formula Used
Direct conversion: kW = W ÷ 1000
Single-phase watts: W = V × A × PF
Three-phase watts: W = √3 × V × A × PF
Efficiency adjustment: Adjusted W = Base W ÷ (Efficiency ÷ 100)
Energy: kWh = kW × operating hours
Cost: Cost = kWh × tariff per kWh
This calculator converts watts into kilowatts and also supports deriving watts from voltage, current, and power factor. Efficiency can raise source demand, quantity scales the total connected load, and operating hours convert power into energy for cost analysis.
How to Use This Calculator
- Select a calculation mode: direct, single-phase, or three-phase.
- Enter watts directly or provide voltage, current, and power factor.
- Add efficiency if upstream losses must be considered.
- Enter quantity to total multiple identical loads.
- Provide daily hours, monthly days, and tariff for energy estimates.
- Choose decimal precision and click Convert and Analyze.
- Review the result block under the header, then export CSV or PDF if needed.
FAQs
1) What is the difference between watts and kilowatts?
Watts measure power directly. Kilowatts represent the same power scaled by one thousand, making larger electrical loads easier to read and compare.
2) Why do we divide watts by 1000?
One kilowatt equals 1000 watts. Dividing by 1000 converts smaller power units into the larger standard used for equipment ratings and billing.
3) When should I use power factor?
Use power factor when watts are derived from voltage and current. Resistive loads may be near 1.0, while motors and inductive equipment are usually lower.
4) Why include efficiency in this converter?
Efficiency helps estimate the actual source demand. If equipment is not perfectly efficient, the upstream watt requirement becomes higher than the useful output power.
5) Can this calculator estimate energy cost?
Yes. Enter hours per day, days per month, and your tariff per kWh. The tool then estimates daily, monthly, and annual energy use and cost.
6) Is the three-phase formula different from single-phase?
Yes. Three-phase power uses √3 × voltage × current × power factor. Single-phase power uses voltage × current × power factor without the √3 factor.
7) What if my load changes during the day?
Use average operating values for a quick estimate. For tighter planning, run multiple scenarios and compare their daily or monthly energy results.
8) Are CSV and PDF exports stored anywhere?
No. The export buttons generate files in your browser session from the displayed results, so nothing extra needs to be stored server-side.