Three-Phase Power Calculator
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Three-Phase Power Calculator
Our Three-Phase Power Calculator helps you instantly convert voltage and current into real power (watts or kilowatts) for three-phase electrical systems. It’s a simple but essential tool for engineers, electricians, and facilities managers working with commercial and industrial setups.
Three Phase Power Calculator
How This Three Phase Power Calculator Works
In a three-phase power system, real power is calculated using this formula:
Watts = √3 × Volts × Amps × Power Factor
(Where √3 ≈ 1.732)
This calculator uses the full precision of that constant to give you accurate results. You can leave the power factor blank if you’re working with resistive loads, or enter a value (usually 0.8 to 0.95) for motors, compressors, and similar inductive equipment.
Why Use The Three Phase Power Calculator?
- Size a generator correctly for three-phase equipment
- Estimate the load demand in large installations
- Plan safe, efficient electrical infrastructure
- Compare loads across different locations or circuits
It’s especially useful for UK-based projects running on 400V three-phase systems, which are standard in commercial and light industrial setups.
Quick Notes
- Voltage should be the line-to-line value (typically 400V in the UK).
- Current is the measured or rated line current.
- Power Factor is optional; default is 1.0 for simple resistive loads.
WHY CHOOSE US?
Why Choose Canning Generator Solutions?
In short, we get the job done. When power generation and energy management are neglected, the consequences can be disastrous. It’s critical to have a team that responds proactively to potential issues, and our personal, tight-knit values means you can expect exactly that.
Tailored Services
Every client and project is different, so we prioritise clear communication to develop a rich understanding of each client’s needs.
Responsive
When our services are needed, every second counts. That’s why we guarantee a four-hour response to our clients nationwide, bolstered by our dedicated team of service engineers operating 24/7.
Proactive
While our industry often reacts to emergencies, our ethos is to anticipate and mitigate issues before they escalate. We like to get involved early to better plan and optimise your power.
Honest
The relationships we build with clients are hugely important to us, so we operate with transparency, earning your trust through fair pricing and honest advice.
Reliable
With extensive experience in the commercial power sector, our dedicated team of engineers always find the right solution.
Family Values
It’s not just about business, we genuinely care about our clients and maintain close, respectful relationships with them. Your power really is our priority.
THREE PHASE POWER CALCULATOR
Frequently Asked Questions
What is three-phase power?
Three-phase power is a type of electrical system commonly used in commercial and industrial settings. It delivers electricity using three alternating currents, providing a more stable and efficient supply than single-phase systems. In the UK, three-phase systems typically use 400V line-to-line.
How do I calculate three-phase power manually?
The formula used is:
Watts = √3 × Voltage × Amps × Power Factor
or
Watts = 1.732 × V × A × PF
This gives the real power being consumed. Our calculator uses this exact formula with precision, so you don’t have to.
What voltage should I enter for UK systems?
In most UK three-phase setups, the line-to-line voltage is 400 volts. This is the standard for both industrial and many larger commercial installations.
What is a power factor, and do I need to enter it?
Power factor (PF) reflects how efficiently power is used.
- 1.0 = perfect efficiency (used for resistive loads like heaters)
- 0.8–0.95 = typical for inductive loads like motors or compressors
If you’re unsure, leave it blank; the calculator will default to 1.0.
Is this calculator accurate enough to determine the size of a generator?
It gives you a reliable estimate for typical site loads. However, when selecting a generator, you also need to consider:
- Starting loads (especially with motors or HVAC systems)
- Diversity of load types
- Runtime expectations
For a full recommendation, we suggest contacting our team for a free consultation.
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Every sector has unique power needs, and we’re equipped to meet yours head-on. We listen carefully to you and deliver tailored solutions that are as diverse as the sectors we serve. Request a site survey to discover how we can keep your power flowing.