Free Online Design Tool
Design SMPS Magnetics
Right in Your Browser
Enter your electrical specs and the MCS Magnetics SMPS Design Program instantly calculates turns, wire sizes, core selection, losses and temperature rise — for transformers, inductors, chokes and current-sense designs. No download. No spreadsheets. Free to use.
Opens in your browser — request access from within the program. Free to use.
What Is It
A complete magnetics calculator, online
The MCS Magnetics SMPS Design Program turns your electrical requirements into a buildable magnetic component in seconds. Pick a design mode, enter your specs, and get turns, wire gauge, core recommendations, a full loss breakdown and estimated temperature rise — with a visual winding layout you can review before you commit. Just fast, accurate magnetics design.
Design Modes
Four ways to design
Choose a mode and the program adapts its inputs to exactly what that component needs.
Transformers
Isolated power transformers for every major SMPS topology.
Inductors
Buck, boost and buck-boost inductors across three core families.
Common-Mode Chokes
EMI filter chokes designed to your attenuation, line current and frequency range.
Current-Sense Transformers
Precision sensing designs to a target ratio, burden and accuracy.
Key Features
Built for real design work
Everything you need to go from spec to a manufacturable part in one place.
Comprehensive Core Library
Access 500+ core sizes from major manufacturers — no datasheet hunting.
Real-Time Calculations
Every input updates turns, wire, losses and temperature instantly. No waiting.
Built-In Optimizer
Rank candidate cores by your criteria and let the tool surface the best fit.
Visual Winding Layout
See the physical winding build and fit before committing to a design.
Loss Analysis
A clear core-loss and copper-loss breakdown for every candidate.
Temperature Estimation
Predicted temperature rise so you can design to your thermal budget.
How It Works
From spec to part in five steps
A guided flow that gets you to a verified design fast.
Select Design Mode
Transformer, inductor, choke or current sense.
Enter Specifications
Voltages, currents, frequency and your targets.
Select or Optimize Core
Pick a core or let the optimizer rank them.
Review Results
Turns, wire, losses, temperature and winding layout.
Save & Export
Store the design and request a quote in one click.
Who Is This For
Designed for everyone who builds with magnetics
From first-year students to production engineers.
Power Electronics Engineers
Size and verify magnetics for new SMPS designs without leaving the browser.
Students & Educators
Learn magnetics design hands-on with real cores and instant feedback.
Procurement & Sourcing
Validate specs and turn a saved design straight into an RFQ.
Hobbyists & Makers
Design reliable transformers and inductors for your own builds, free.
Save your designs, pick up where you left off
Create a free account to store your designs in the browser and return to them anytime. When a design is ready to build, send it straight to us for pricing.
- Save unlimited designs to your account
- Reopen and tweak any previous design
- Click “Request Quote” on any saved design to get pricing
- Keep a history of revisions as your spec evolves
From Design to Reality
Design it. Then let us build it.
When your design is ready, MCS Magnetics manufactures it — from prototypes to production. Launch the program to start designing, or send us a saved design for a quote.
Current release: MCS Magnetics SMPS V1.001
Design Your Part — Custom Magnetics RFQ
Tell us about your magnetics requirement — pick the product category, then fill in the specs. Sections will adapt to what you select.
Get a Quote — Request pricing on catalog parts
Add one or more MCS catalog parts to your quote request. Start typing in the part field to autocomplete from the series list, or just type a part number directly.