JHCOILS ENGINEERING TOOLS
Coil Engineering
Calculators
Check winding space, plan a resonance target or compare DC electrical values. Choose the tool that matches your design question, then save a specification for review.
Bobbin Winding Calculator
Check how many turns fit a round or rectangular bobbin. Estimate winding layers, finished dimensions, wire length, copper weight and DC resistance.
Open calculator ↗RFID & NFC Tuning Calculator
Estimate tuning capacitance, target inductance or resonant frequency for an ideal RFID/NFC parallel LC circuit. Check tolerance ranges and optional winding Q.
Open calculator ↗DC Solenoid Coil Calculator
Calculate DC solenoid coil current, power and ampere-turns at a specified copper temperature. Start with resistance, wire dimensions or target electrical power.
Open calculator ↗Use actual wire and component data where available. Each tool states its calculation scope and assumptions, and keeps numerical estimates separate from manufacturing approval.
Magnet Wire Resistance & Weight Calculator
Estimate DC resistance, bare-copper weight and DC copper loss for round, flat or Litz wire, including both leads.
Open calculatorFerrite Core Inductance & Turns Calculator
Calculate inductance or whole turns from a specified core AL value, and compare the range caused by AL tolerance.
Open calculatorAM Antenna LC Tuning Calculator
Find tuning capacitance from a known antenna inductance and check the ideal range of a variable capacitor.
Open calculatorDESIGNED FOR SPECIFICATION WORK
Useful inputs. Reviewable results.
Turn the questions behind a coil design into dimensions and electrical values you can discuss.
Start with your constraint
Choose winding space, a resonance target or fixed DC voltage. Enter the parameters you know and inspect the result as you edit.
Make the assumptions visible
Check wire insulation, lead lengths, component tolerances and copper temperature. Each calculator explains what it can estimate.
Save and share the design
Export a branded PDF or prepare an inquiry summary. Include your drawing, operating conditions and acceptance requirements for review.
CONTINUE YOUR DESIGN
The next step for your coil.
Keep the calculation with your drawing and target specifications when discussing a coil design.