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kVA to Amps Converter

Enter apparent power in kVA, choose single-phase or three-phase and the voltage, and the current in amps appears as you type. Works in reverse too, for transformers, generators and UPS units.

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kVA
A
 

Step-by-step calculation

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    How to use the kVA to Amps Converter

    1. Choose the phase: single-phase or three-phase.
    2. Pick a voltage from the presets or type your own. For three-phase use the line-to-line voltage.
    3. Type the kVA rating. The current in amps appears instantly.
    4. Going the other way? Type in the Amps box or press ⇄ to get kVA from current.
    5. Check the steps and the extra values, then press Copy result.

    kVA to amps formula

    I = kVA × 1000 ÷ V  ·  I = kVA × 1000 ÷ (√3 × V)
    1. Single-phase: amps = kVA × 1000 ÷ volts.
    2. Three-phase: amps = kVA × 1000 ÷ (1.732 × line-to-line volts). The result is the current in each line.

    Example (single-phase): a 25 kVA transformer at 240 V → 25 × 1000 ÷ 240 = 104.2 A.

    Example (three-phase): a 75 kVA transformer at 480 V → 75,000 ÷ (1.732 × 480) = 75,000 ÷ 831.4 = 90.2 A.

    Reverse formula: kVA = V × I ÷ 1000 (single-phase) or kVA = 1.732 × V × I ÷ 1000 (three-phase).

    There is no power factor in these formulas: kVA is apparent power, which already includes the reactive part. Power factor only matters when you start from real power in kW (kVA = kW ÷ PF).

    Transformer full-load current table

    Full-load current for standard transformer ratings, calculated with the formulas above. Use it to check feeder, breaker and fuse sizing against the rules that apply to your installation.

    Single-phase transformers

    RatingAmps at 120 VAmps at 240 V
    10 kVA83.3 A41.7 A
    15 kVA125 A62.5 A
    25 kVA208.3 A104.2 A
    37.5 kVA312.5 A156.2 A
    50 kVA416.7 A208.3 A
    75 kVA625 A312.5 A
    100 kVA833.3 A416.7 A
    167 kVA1,391.7 A695.8 A

    Three-phase transformers

    RatingAmps at 208 VAmps at 400 VAmps at 480 V
    15 kVA41.6 A21.7 A18 A
    30 kVA83.3 A43.3 A36.1 A
    45 kVA124.9 A65 A54.1 A
    75 kVA208.2 A108.3 A90.2 A
    112.5 kVA312.3 A162.4 A135.3 A
    150 kVA416.4 A216.5 A180.4 A
    225 kVA624.5 A324.8 A270.6 A
    300 kVA832.7 A433 A360.8 A
    500 kVA1,387.9 A721.7 A601.4 A
    750 kVA2,081.8 A1,082.5 A902.1 A
    1,000 kVA2,775.7 A1,443.4 A1,202.8 A
    1,500 kVA4,163.6 A2,165.1 A1,804.2 A
    2,000 kVA5,551.4 A2,886.8 A2,405.6 A
    2,500 kVA6,939.3 A3,608.4 A3,007 A

    kVA to amps conversion table

    These tables follow the phase and voltage selected in the converter. Click any row to load it.

    kVA to amps at 240 V 1-phase

    Kilovolt-amperesAmps
    1 kVA4.17 A
    2 kVA8.33 A
    3 kVA12.5 A
    4 kVA16.67 A
    5 kVA20.83 A
    6 kVA25 A
    7 kVA29.17 A
    8 kVA33.33 A
    9 kVA37.5 A
    10 kVA41.67 A
    11 kVA45.83 A
    12 kVA50 A
    13 kVA54.17 A
    14 kVA58.33 A
    15 kVA62.5 A
    16 kVA66.67 A
    17 kVA70.83 A
    18 kVA75 A
    19 kVA79.17 A
    20 kVA83.33 A
    21 kVA87.5 A
    22 kVA91.67 A
    23 kVA95.83 A
    24 kVA100 A
    25 kVA104.17 A
    26 kVA108.33 A
    27 kVA112.5 A
    28 kVA116.67 A
    29 kVA120.83 A
    30 kVA125 A
    31 kVA129.17 A
    32 kVA133.33 A
    33 kVA137.5 A
    34 kVA141.67 A
    35 kVA145.83 A
    36 kVA150 A
    37 kVA154.17 A
    38 kVA158.33 A
    39 kVA162.5 A
    40 kVA166.67 A
    41 kVA170.83 A
    42 kVA175 A
    43 kVA179.17 A
    44 kVA183.33 A
    45 kVA187.5 A
    46 kVA191.67 A
    47 kVA195.83 A
    48 kVA200 A
    49 kVA204.17 A
    50 kVA208.33 A
    51 kVA212.5 A
    52 kVA216.67 A
    53 kVA220.83 A
    54 kVA225 A
    55 kVA229.17 A
    56 kVA233.33 A
    57 kVA237.5 A
    58 kVA241.67 A
    59 kVA245.83 A
    60 kVA250 A
    61 kVA254.17 A
    62 kVA258.33 A
    63 kVA262.5 A
    64 kVA266.67 A
    65 kVA270.83 A
    66 kVA275 A
    67 kVA279.17 A
    68 kVA283.33 A
    69 kVA287.5 A
    70 kVA291.67 A
    71 kVA295.83 A
    72 kVA300 A
    73 kVA304.17 A
    74 kVA308.33 A
    75 kVA312.5 A
    76 kVA316.67 A
    77 kVA320.83 A
    78 kVA325 A
    79 kVA329.17 A
    80 kVA333.33 A
    81 kVA337.5 A
    82 kVA341.67 A
    83 kVA345.83 A
    84 kVA350 A
    85 kVA354.17 A
    86 kVA358.33 A
    87 kVA362.5 A
    88 kVA366.67 A
    89 kVA370.83 A
    90 kVA375 A
    91 kVA379.17 A
    92 kVA383.33 A
    93 kVA387.5 A
    94 kVA391.67 A
    95 kVA395.83 A
    96 kVA400 A
    97 kVA404.17 A
    98 kVA408.33 A
    99 kVA412.5 A
    100 kVA416.67 A

    Amps to kVA at 240 V 1-phase

    AmpsKilovolt-amperes
    1 A0.24 kVA
    2 A0.48 kVA
    3 A0.72 kVA
    4 A0.96 kVA
    5 A1.2 kVA
    6 A1.44 kVA
    7 A1.68 kVA
    8 A1.92 kVA
    9 A2.16 kVA
    10 A2.4 kVA
    11 A2.64 kVA
    12 A2.88 kVA
    13 A3.12 kVA
    14 A3.36 kVA
    15 A3.6 kVA
    16 A3.84 kVA
    17 A4.08 kVA
    18 A4.32 kVA
    19 A4.56 kVA
    20 A4.8 kVA
    21 A5.04 kVA
    22 A5.28 kVA
    23 A5.52 kVA
    24 A5.76 kVA
    25 A6 kVA
    26 A6.24 kVA
    27 A6.48 kVA
    28 A6.72 kVA
    29 A6.96 kVA
    30 A7.2 kVA
    31 A7.44 kVA
    32 A7.68 kVA
    33 A7.92 kVA
    34 A8.16 kVA
    35 A8.4 kVA
    36 A8.64 kVA
    37 A8.88 kVA
    38 A9.12 kVA
    39 A9.36 kVA
    40 A9.6 kVA
    41 A9.84 kVA
    42 A10.08 kVA
    43 A10.32 kVA
    44 A10.56 kVA
    45 A10.8 kVA
    46 A11.04 kVA
    47 A11.28 kVA
    48 A11.52 kVA
    49 A11.76 kVA
    50 A12 kVA
    51 A12.24 kVA
    52 A12.48 kVA
    53 A12.72 kVA
    54 A12.96 kVA
    55 A13.2 kVA
    56 A13.44 kVA
    57 A13.68 kVA
    58 A13.92 kVA
    59 A14.16 kVA
    60 A14.4 kVA
    61 A14.64 kVA
    62 A14.88 kVA
    63 A15.12 kVA
    64 A15.36 kVA
    65 A15.6 kVA
    66 A15.84 kVA
    67 A16.08 kVA
    68 A16.32 kVA
    69 A16.56 kVA
    70 A16.8 kVA
    71 A17.04 kVA
    72 A17.28 kVA
    73 A17.52 kVA
    74 A17.76 kVA
    75 A18 kVA
    76 A18.24 kVA
    77 A18.48 kVA
    78 A18.72 kVA
    79 A18.96 kVA
    80 A19.2 kVA
    81 A19.44 kVA
    82 A19.68 kVA
    83 A19.92 kVA
    84 A20.16 kVA
    85 A20.4 kVA
    86 A20.64 kVA
    87 A20.88 kVA
    88 A21.12 kVA
    89 A21.36 kVA
    90 A21.6 kVA
    91 A21.84 kVA
    92 A22.08 kVA
    93 A22.32 kVA
    94 A22.56 kVA
    95 A22.8 kVA
    96 A23.04 kVA
    97 A23.28 kVA
    98 A23.52 kVA
    99 A23.76 kVA
    100 A24 kVA

    Common values at 240 V 1-phase

    Kilovolt-amperesAmpsExample
    1 kVA4.2 ASmall UPS
    3 kVA12.5 AOffice UPS / small generator
    5 kVA20.8 APortable generator
    10 kVA41.7 AHome standby generator
    15 kVA62.5 APole transformer (small)
    25 kVA104.2 APole transformer (typical home group)
    37.5 kVA156.2 APole transformer
    50 kVA208.3 APole transformer (large)
    75 kVA312.5 APad-mount / small building
    150 kVA625 ACommercial building
    500 kVA2,083.3 ALarge commercial service
    1,000 kVA4,166.7 AIndustrial substation transformer

    Practical tips

    • Use line-to-line voltage for three-phase. On a 208Y/120 V system, enter 208 V, not 120 V. On 480Y/277 V, enter 480 V.
    • Primary and secondary differ. A transformer has the same kVA on both sides, so the high-voltage side carries proportionally less current. A 75 kVA, 480 V to 208 V unit draws about 90 A on the primary and delivers about 208 A on the secondary.
    • Leave headroom. Continuous loads are commonly sized at 125% of the running current, and transformers are usually loaded to no more than about 80% of their rating for long life.
    • Generators and UPS units are often rated in both kVA and kW. The kW figure (typically kVA × 0.8) is the real power they can deliver.

    Frequently asked questions

    How do you convert kVA to amps?

    For single-phase, amps = kVA × 1000 ÷ volts. For three-phase, amps = kVA × 1000 ÷ (1.732 × line-to-line volts).

    How many amps is 1 kVA?

    1 kVA is 8.33 A at 120 V, 4.17 A at 240 V single-phase, 2.78 A at 208 V three-phase and 1.20 A at 480 V three-phase.

    How many amps is a 75 kVA transformer?

    At 480 V three-phase it carries about 90.2 A, and at 208 V three-phase about 208.2 A at full load.

    Why is there no power factor in kVA to amps?

    kVA is apparent power (volts × amps), so current follows directly from it. Power factor is only needed to go between kW and kVA or between kW and amps.

    What voltage should I use for three-phase?

    Use the line-to-line voltage, such as 208 V, 400 V or 480 V. The result is the current flowing in each of the three lines.

    How many amps does a 10 kVA generator supply?

    At 240 V single-phase a 10 kVA generator supplies about 41.7 A at full load. Its real-power rating is usually 8 kW at a power factor of 0.8.

    Is this kVA to amps calculator free?

    Yes. It is free, needs no sign-up and runs entirely in your browser, so nothing you enter is sent anywhere.

    Are all the tools on FreeToolCabin tested for quality and accuracy?

    Yes! Every tool on our site undergoes automated Q/A testing in real browser environments to ensure high precision, correct output, and zero errors. If you happen to spot a bug or have a suggestion, please contact us at [email protected] and our team will review it right away.

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