Transformer Turns Ratio Calculator

Send an Inquiry

To receive a quote for your project, please fill in the following information, and we’ll get back to you promptly.

Submit Inventory List

Please fill in the following information, and we’ll get back to you promptly.

Calculate transformer primary-to-secondary turns ratio, required winding turns, current ratio, VA-based current, and estimated output power for transformer reference design.

Input Parameters

Primary Voltage

Rated or applied primary voltage.

Secondary Voltage

Desired or measured secondary voltage.

Primary Turns

turns

Known primary winding turns. Used to estimate secondary turns.

Transformer Rating

Apparent power rating or design target.

Estimated Efficiency

Used to estimate output power and input current.

Results

Turns Ratio

Required Secondary Turns

Primary Current

Secondary Current

Estimated Output Power

Design Note

Equations Used

Voltage Ratio: V_p / V_s = N_p / N_s

Secondary Turns: N_s = N_p × V_s / V_p

Primary Current: I_p = VA / V_p

Secondary Current: I_s = VA × Efficiency / V_s

Ideal Current Ratio: I_s / I_p ≈ V_p / V_s

Frequently Asked Questions (FAQ)

Q1: What is transformer turns ratio?
It is the ratio between primary and secondary winding turns, and ideally it equals the primary-to-secondary voltage ratio.

Q2: Does this calculator include core saturation?
No. It estimates ratio and current only. Core size, flux density, frequency, waveform, and insulation are separate design requirements.

Q3: Why is transformer current inversely related to voltage?
For an ideal transformer, power is approximately conserved, so a lower secondary voltage can deliver higher current.

Q4: Can this be used for SMPS transformers?
Only as a basic turns-ratio reference. Switching transformer design also requires duty cycle, topology, core material, frequency, and flux calculations.

Q5: Why include efficiency?
Real transformers have copper, core, and stray losses. Efficiency helps estimate practical output power and input current.

Q6: Can I use this for current transformers?
Current transformers require additional burden and saturation analysis, so this tool is mainly for voltage transformers.

Disclaimer: This tool provides ideal transformer ratio and current estimates. It does not replace magnetic core design, insulation coordination, thermal analysis, regulation, leakage inductance, safety certification, or manufacturer design guidance.

Previous Tool Photodiode Transimpedance Calculator Next Tool ESR Calculator

PRODUCT

PHONE

USER