Skip to main content
RK
Rojony Khatun
Last updated: Jun 3, 2026

Tap voltage calculator

Calculate transformer tap voltage to match supply and load requirements. Ideal for power engineers and electricians to ensure correct voltage delivery.

Advertisement
Advertisement
Advertisement

Tap voltage calculator

Calculate transformer tap voltage to match supply and load requirements. Ideal for power engineers and electricians to ensure correct voltage delivery.

Advertisement

electrical tap adjustment calculator

Tap voltage is computed by multiplying a transformer's nominal voltage by 1 plus or minus the tap percentage (add or subtract) in order to get tap-up voltage or tap-down voltage, respectively.

Formula & Table Summary:

  • V_nominal = Transformer nominal voltage
  • Tap% = Percentage tap adjustment
  • V_out = Adjusted output voltage
Sponsored

transformer voltage correction

A Tap Voltage Calculator calculated the output voltage of a transformer as a function of tap setting. Transformers use tap changers to precisely adjust the output voltage range to cope with fluctuating supply voltages or loads. Output voltage is obtained by modifying the nominal voltage on basis of a percentage change, which is determined by the tap setting. The rough formula is: rojony1.  To use as an example, a transformer with a nominal voltage of 11 kV applied at +5%, there is an output that will be: This rational tool would be useful to power engineers, electricians, and maintenance technicians within distribution systems in order to ensure stable and smooth running.

voltage adjustment tap calculator

V_nominal (V) Tap % V_out (V)
11000 +5 11550
11000 -5 10450
Advertisement

Frequently Asked Questions - Tap voltage calculator:

It calculates the transformer output voltage based on tap settings.
To match output voltage with supply and load conditions.
Vout = Vnominal × (1 + Tap%/100).
It increases output voltage by 5% over nominal.
It decreases output voltage by 5% below nominal.
Only with on-load tap changers (OLTC); off-load requires shutdown.
On-Load Tap Changer adjusts taps without interrupting power.
Typically within ±1% to ±2% of nominal voltage.
No, taps only change voltage level.
Yes, prolonged incorrect voltage can overheat or underpower loads.
Advertisement
Advertisement
Advertisement