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.
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.
General Electrical Tools
Quick utilities for unit conversion, rated current estimation, resistor decoding, and other supporting calculations.
Length Converter
Convert mil, inch, mm, and other common units.
Rated Current Calculator
Transformers, motors, and capacitor bank current estimation.
Resistor Color Code
Decode and reverse-check resistor band values.
Voltage Divider Calculator
Solve node voltage and resistor dissipation quickly.
Temperature Converter
Convert Celsius, Fahrenheit and Kelvin.
Frequency & Wavelength Calculator
Convert frequency (Hz-GHz) to wavelength and antenna sizes.
EMC Unit Converter
Convert V/dBV/dBuV and W/dBW/dBm for EMC and RF work.
Electronic Components
LED Current Limiting Resistor
Calculate series resistor for LED drive circuits.
555 Timer Calculator
Astable frequency/duty-cycle and monostable pulse width.
LC Resonance Calculator
Resonant frequency, L or C from any two known values.
RC Circuit Calculator
Cutoff frequency, time constant τ, and charge/discharge voltage.
LM317 Output Voltage
Calculate Vout or R2 for LM317/LM338/LM350/LM1117.
Parallel Resistance Calculator
Equivalent resistance for 2–10 parallel resistors.
BJT Bias Calculator
NPN/PNP Q-point for fixed-bias and voltage-divider circuits.
Mechanical Design
Springs, cylinders, gears, chains, timing belts, and interference fits — everyday mechanical design calculations.
Compression Spring Calculator
Stiffness, load, and stress verification for compression springs.
Cylinder Force Calculator
Push/pull force and safety factors for pneumatic cylinders.
Gear Parameter Calculator
Spur gear dimensions from module and tooth count.
Chain Length Calculator
Roller chain link count and total length.
Timing Belt Calculator
Belt pitch length and pulley diameter estimation.
Interference Fit Calculator
Min/max interference for shaft-hub connections.
Servo Motor Calculator
Torque, power, and inertia ratio for motor selection.
Ball Screw Calculator
Inertia, torque, and speed for ball screw sizing.
Strength Calculator
Normal, shear, impact, and bending stress checks.
Cam Indexer Calculator
Inertia and torque for rotary cam indexer selection.
Vacuum Cup Calculator
Suction force and cup count for pick-and-place.
Pin & Key Calculator
Pin shear and key crush/shear strength checks.
V-Belt Calculator
Belt pitch length with A/B/C standard matching.
Air Consumption Calculator
Cylinder air flow and solenoid valve Cv sizing.
Press-Fit Force Calculator
Press-fit assembly force from interference.
Cutting Speed Calculator
RPM, surface speed, and feed rate conversion.
Metric Thread Chart
M1–M48 thread dimensions and tap drill sizes.
Ball Bearing Lookup
Deep groove bearing dimensions and load ratings.
Hydraulic Cylinder Calculator
Force, speed, flow and rod buckling check.
Power Torque Converter
kW, Nm, and RPM inter-conversion.
Material Properties
Elastic modulus, density, yield strength lookup.
Column Buckling Calculator
Euler critical load for compression members.
Counterbore Chart
Socket head screw clearance and counterbore sizes.
GD&T Tolerance Lookup
Straightness, flatness, roundness per ISO 2768.
Worm Gear Calculator
Worm drive geometry and center distance.
Gear Rack Calculator
Rack & pinion motor selection.
Y-Series Motor Specs
Power, current, speed and torque lookup.
Tolerance Stack-up
Extreme value dimension chain calculator.
Belt Drive Calculator
Inertia, torque and speed for belt systems.
Tapered Roller Bearing
30/32/33 series bearing specs.
Thrust Ball Bearing
51100-51400 series dimensions.
Imperial Thread Chart
UNC/UNF tap drill sizes.
Material Hardness Chart
SPCC/SECC/SUS Hv lookup.
Blanking Force
Stamping/shearing force calculator.
Key & Keyway Chart
Parallel key dimensions by shaft dia.
Bending Force Calculator
Sheet metal V-bending/U-bending tonnage and bending energy calculator.
Thread Engagement Calculator
Determine thread engagement, thread hole depth, and tap drill depth.
Retaining Rings & E-Clips
Look up standard retaining ring and E-clip dimensions and groove sizes.
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.
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