VA to Watts calculation  Online Electrical Calculators
Enter apparent power (S) in voltamps (VA) and power factor (Pf) and press the Calculate button to get the real power (P) in watts:
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Note, For higher values like 5×10^{3}, 10×10^{6}, 1.6 x10^{12}, enter the value like this for scientific notation as 5e3, 10e6, 1.6e12, etc.
Conversion Using the Power Formula :
AC Single Phase VA to Watts Calculation:
The Real power (P) in watts (W) is equal to the apparent power (S) in voltamps (VA), times the power factor (Pf):
P_{(W)} = 2800 VA
Where:

 S = Apparent Power in VA
 P = Real Power in Watts
 Cosθ = Power factor in AC circuits
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How to use This Calculator?
To use the above “Voltamps (VA) to Watts (W) Conversion Calculator” follow the below steps:
1. Enter Apparent Power: Input the apparent Power (VA) or motor voltage value in the specified input box. You can enter the value in VA by choosing the appropriate option from the dropdown.
2. Enter Power Factor: Input the power factor of the motor in the provided input box. The power factor is a unitless value typically between 0 and 1.
3. Reset: Click the “Reset” If you want to reset the calculator to perform another conversion, you can click the “Reset” button, and all input fields will be cleared.
4. Calculate: Click the “Calculate” button to obtain the results. The calculated results will be displayed in the “Results:” section.
5. Swap: If you want to “Swap” the calculated to Exchange conversion, you can click the “Swap” button, and Calculate will be Exchange.
6. Result: The calculated “result” will be displayed in the respective “Result In Watts (W)” output field.
VA to Watts Conversion table:
VA Rating  Power Factor (Pf)  Power (watts) 

350  0.90  315 
650  0.90  585 
800  0.90  720 
1000  0.90  900 
1250  0.90  1125 
1500  0.90  1350 
1800  0.90  1620 
2000  0.90  1800 
2200  0.90  1980 
2500  0.90  2250 
2700  0.90  2430 
3000  0.90  2700 
3200  0.90  2880 
3500  0.90  3150 
3800  0.90  3420 
4000  0.90  3600 
4500  0.90  4050 
5000  0.90  4500 
5500  0.90  4950 
6000  0.90  5400 
Power Factor Value 0.9 
Device  Typical PF 

Resistive Load  1 
Fluorescent Lamp  0.95 
Incandescent Lamp  1 
Induction Motor full load  0.85 
Induction Motor no Load  0.35 
Resistive Oven  1 
Synchronous Motor  0.9 
Power Factor Value conversion table 
Frequently asked questions
A watt changes depending on whether the electrical circuit is AC or DC. In a DC circuit, 111 VA is the equivalent of 100 W. This equivalence means that the power factor of that power supply is 0.90.
Use the following formula to calculate VA from watts: Apparent Power(VA) = Real Power in Watts / Power factor in PF.
Here rating of the inverter is 850 VA, so it can handle 850 VA maximum. Considering the power factor of 0.80, the total wattage will be 850 X 0.9 = 765 Watts.
That 1500VA (or 1500Watt) means that the UPS can deliver 1500W maximum. It has no relation to the battery capacity nor how much current is used to charge the battery.
A voltamps x power factor = watts. When you want to know how much the electricity is costing you, you use watts. When you are specifying equipment loads, fuses, and wiring sizes you use the VA, or the voltage times the amperage.