Engineering calculators for day-to-day PCB design work
The English site focuses on practical design checks: copper bar current capacity, PCB spacing, voltage drop, impedance, skin depth, and supporting utility tools.
Fast estimates, reference values, and practical guardrails before deeper simulation or lab validation.
Start with a calculator, then review the matching topic hub to understand assumptions and common tradeoffs.
Copper Bar and Ampacity
Use these tools for copper bar sizing, ampacity checks, resistance, and material planning during high-current design.
Copper Bar Current Capacity
Thermal-balance ampacity and loss estimation.
Copper Bar Resistance
Resistance, power loss, and voltage drop for copper bars.
Copper Bar Price Calculator
Estimate cost before quotation and procurement.
Metal Weight Calculator
Convert dimensions into copper, brass, or aluminum weight.
Power Supply and Electrical
3-Phase Power Calculator
Active, reactive, apparent power and power factor.
Cable Cross Section Calculator
Cable wire gauge & voltage drop double check.
Motor Power & Current Calculator
Single/3-phase motor FLA, breaker & cable sizing.
Transformer Turns Ratio Calculator
Turns ratio, secondary voltage/current & core area.
Fuse Selection Calculator
Fuse rating with inrush surge & temp derating.
PCB Signal and Safety
Focus on spacing, voltage drop, skin depth, and impedance when reviewing high-voltage and high-speed PCB layouts.
PCB Spacing Calculator
Estimate clearance from IPC-2221 and IPC-9592 guidance.
Trace Voltage Drop
Estimate resistance, drop, power loss, and temperature rise.
Skin Depth Calculator
Understand frequency-dependent conductor loss.
PCB Impedance Calculator
Microstrip and stripline impedance calculations.
PCB Trace Current Calculator
IPC-2221 external/internal trace ampacity & drop.
Electronics & Circuit Design
Capacitive Power Supply Calculator
Transformerless RC dropper C, Xc & resistor power.
NTC Thermistor Temperature Calculator
B-value & Steinhart-Hart equation with MCU ADC.
LED Resistor Calculator
Series LED resistor, E24 match & power rating.
LC Filter Cutoff Calculator
Cutoff frequency fc, Z0 impedance & Q factor.
MCU PWM Calculator
PWM frequency, duty cycle & resolution bits.
General Electrical Tools
Quick utilities for unit conversion, rated current estimation, resistor decoding, and other supporting calculations.
Mechanical Design
Springs, cylinders, gears, chains, timing belts, and interference fits — everyday mechanical design calculations.
Pulley Speed & Ratio Calculator
Driver/driven pulley ratio, RPM & belt speed.
Thread Tap Drill Calculator
Metric cut & form tap drill size & depth.
CNC Cutting Speed & Feed Calculator
Spindle RPM, cutting speed Vc & feed Vf.
Gear Module & Center Distance
Spur & helical gear pitch dia & center distance.
Pneumatic Cylinder Calculator
Push/pull force (N/lbf) & ANR air flow.
Reference Hub
Browse the English reference hub to jump between key tools by topic.
Contact
Use the contact page for technical questions, copper bar projects, and support requests.
Chinese Main Site
Need the full Chinese engineering content set? Switch to the Chinese homepage for the broader content hub.
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