Engineering Calculators
BETAFree online calculators for electronics engineers and hobbyists
Most Popular
Ohm's Law Calculator
POPULARCalculate voltage, current, resistance, and power using V=IR and P=VI relationships.
Voltage Divider
POPULARCalculate output voltage for resistive voltage dividers with two resistors.
LED Series Resistor
POPULARCalculate the current-limiting resistor value for LEDs with power rating.
Resistor Color Code
POPULARDecode 4, 5, or 6-band through-hole resistor color codes with visual display.
Low-Pass Filter (LPF)
POPULARCalculate cutoff frequency for RC, RL, and LC low-pass filters.
PCB Trace Width (IPC-2221)
POPULARCalculate minimum trace width for current capacity using IPC-2221 standard.
Number System Converter
POPULARConvert between binary, decimal, hexadecimal, and octal number systems.
All Calculators
Battery Life Calculator
Estimate runtime for various battery types including Li-Ion, LiPo, NiMH, and alkaline.
SMD Resistor Code
Decode 3-digit, 4-digit, and EIA-96 SMD resistor markings.
Series/Parallel Resistors
Calculate equivalent resistance for resistors in series or parallel configurations.
Capacitor Code (3-Digit)
Decode and encode 3-digit ceramic capacitor markings (e.g., 104 = 100nF).
SMD Capacitor Code
Decode SMD ceramic and tantalum capacitor markings.
Series/Parallel Capacitors
Calculate equivalent capacitance for capacitors in series or parallel.
High-Pass Filter (HPF)
Calculate cutoff frequency for RC, RL, and LC high-pass filters.
Band-Pass Filter (BPF)
Calculate center frequency, bandwidth, and Q factor for band-pass filters.
Microstrip Impedance
Calculate characteristic impedance for microstrip PCB traces.
Differential Pair Impedance
Calculate differential impedance for edge-coupled and broadside-coupled pairs.
SMD Package Reference
Reference guide for SMD package sizes in imperial (0603) and metric (1608) formats.
PCB Length Converter
Convert between mm, mil (thou), inch, and micrometers for PCB design.
SMD Pad Calculator
Calculate IPC-7351 compliant land patterns for SMD components.
Electrical Unit Converter
Convert between all electrical units: resistance, capacitance, inductance, voltage, current, and more.
Frequency ↔ Wavelength
Convert between frequency and wavelength for RF and electromagnetic waves.
Disclaimer: These calculators are provided for reference purposes only. Always verify calculations with manufacturer datasheets and professional design tools before use in production. NSquare Bros is not liable for any errors or damages arising from the use of these tools.