Generator Size Calculator
Calculate Your Requirements Quickly & Accurately
Choosing the correct generator size is essential for ensuring reliable power, preventing overloads, and maintaining efficient operation of critical equipment. Our generator power calculators help you quickly convert between kVA, kW, and Amps for both single-phase and three-phase systems.
Whether you are sizing a generator for a commercial building, industrial facility, construction site, data centre, or temporary power application, these tools provide fast and accurate calculations to support your project.
Power Calculator Tools
1
kVA to Amps Calculator
Convert generator capacity from kVA into Amps using your required voltage and phase configuration.
This calculator is commonly used when:
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Sizing cabling and breakers
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Determining current draw
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Checking generator compatibility with equipment
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Planning temporary power installations
2
Amps to kW Calculator
Convert electrical current into real power output (kW).
Ideal for:
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Load assessments
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Electrical design calculations
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Generator sizing exercises
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Equipment power demand analysis
3
kW to Amps Calculator
Convert real power (kW) into electrical current (Amps).
This is particularly useful when:
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Designing electrical systems
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Selecting generators or UPS systems
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Calculating load requirements
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Reviewing electrical infrastructure capacity
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Understanding Generator Power Ratings
What is kVA?
kVA (kilovolt-amperes) represents apparent power. This is the total amount of power supplied by a generator or electrical system.
Generator manufacturers commonly rate generators in kVA because it reflects the total electrical capacity available.
What is kW?
kW (kilowatts) represents real power - the usable power that actually performs work.
Electrical equipment such as motors, lighting, HVAC systems, pumps, and machinery consume real power.
The relationship between kVA and kW is determined by the power factor.
Formula: kW = kVA × Power Factor
What is Power Factor?
Power Factor (PF) measures how efficiently electrical power is being used.
A standard generator power factor is typically:
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0.8 PF for industrial and generator applications
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1.0 PF for purely resistive loads
Lower power factor values mean more current is required to deliver the same usable power.
Single-Phase vs Three-Phase Power
Single-Phase Power
Single-phase systems are commonly used in:
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Residential properties
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Small commercial premises
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Light-duty applications
Three-Phase Power
Three-phase systems are typically used in:
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Industrial facilities
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Data centres
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Manufacturing sites
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Large commercial buildings
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Critical power applications
Three-phase systems deliver power more efficiently and support larger electrical loads.
Common Generator Power Formulas
kVA to Amps
Single Phase
Amps = (kVA × 1000) ÷ Voltage
Three Phase
Amps = (kVA × 1000) ÷ (Voltage × 1.732)
Amps to kW
Single Phase
kW = (Amps × Voltage × Power Factor) ÷ 1000
Three Phase
kW = (Amps × Voltage × 1.732 × Power Factor) ÷ 1000
kW to Amps
Single Phase
Amps = (kW × 1000) ÷ (Voltage × Power Factor)
Three Phase
Amps = (kW × 1000) ÷ (Voltage × 1.732 × Power Factor)
Why Accurate Generator Sizing Matters
Selecting the correct generator size is critical for:
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Preventing overload conditions
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Protecting electrical equipment
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Improving fuel efficiency
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Supporting future load expansion
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Maintaining operational uptime
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Ensuring compliance with electrical standards
Undersized generators can lead to voltage instability, overheating, and equipment failure, while oversized generators can operate inefficiently and increase running costs.
Need Expert Advice?
If you require assistance with generator sizing, UPS systems, critical power infrastructure, or electrical load calculations, our engineering team is here to help.
Contact Dale Power Solutions today to discuss your requirements and receive expert guidance tailored to your application.
