DC Wire & Cable Sizing Calculators
Engineered tools for calculating conductor gauge (AWG and metric mm²), circuit loop resistance, and voltage drop across 12V, 24V, 36V, and 48V DC systems.
Core Sizer
DC Conductor Sizing & Voltage Drop Calculator
Dual-constraint solver determining the exact AWG and mm² conductor needed to satisfy both voltage drop percentage and ABYC Table 6B ampacity limits.
Analysis
Exact DC Voltage Drop Calculator
Analyzes known conductor sizes, determining exact loop resistance, operating voltage at the load, and energy dissipated as heat in watts.
High Amp
Inverter DC Cable Sizing Tool
Sizes primary battery-to-inverter cables accounting for low-voltage cutoff current spikes and terminal lug specs.
Marine
Trolling Motor Cable & Breaker Sizer
Calculates wire gauge and manual-reset thermal circuit breakers for 12V, 24V, and 36V bow and transom trolling motors.
Vehicle
DC-to-DC Charger Cable Sizer
Determines wire sizes for both the input alternator circuit and output auxiliary battery circuit for vehicle chargers.
Solar
Solar Array to MPPT Cable Sizer
Minimizes transmission power losses on rooftop PV strings running to charge controllers.
Battery
Battery Interconnect Cable Sizer
Selects jumper cables and terminal lug dimensions for series and parallel battery banks to maintain balanced cell resistance.
Automotive
Alternator Primary Cable Sizer
Sizes charging cables between the alternator B+ terminal and battery with engine bay ambient temperature derating.
Comparison
Chassis Ground vs Dedicated Return Comparison
Evaluates resistance, voltage drop, and electrical noise differences between vehicle chassis grounding and dedicated copper returns.
Lighting
LED Strip Voltage Drop Sizer
Calculates end-of-run voltage sag on 12V and 24V LED tape lighting to prevent visible color shifts and determine power injection intervals.
Reference Matrix
DC Wire Size Chart & Ampacity Tables
Static cross-tabulated AWG and metric lookup tables for 12V, 24V, and 48V systems at 1%, 2%, and 3% allowable voltage drop.
Hardware Match
Cable Lug Stud & Hole Size Selector
Cross-reference wire gauge (8 AWG to 4/0 AWG) with terminal post stud diameters (1/4", 5/16", 3/8", 1/2", M6, M8, M10, M12), barrel dimensions, and torque limits.
Crimping Guide
Hydraulic Crimper Die Selection Guide
Match stranded copper battery cables to metric hexagonal crimper die codes (10 mm² to 120 mm²) and avoid loose under-crimped or over-extruded lugs.
Insulation
Dual-Wall Adhesive Heat Shrink Tubing Sizer
Calculate expanded vs recovered inner diameter ratios (3:1 and 4:1) to create watertight environmental seals over battery lugs and cable splices.
DC Connectors
Anderson Powerpole Connector Sizer
Select contact ratings (15A, 30A, 45A, SB50, SB120, SB175, SB350) and matching wire barrel gauges with insertion force and hot-plugging guidance.
Geometry
Bare Conductor Diameter & Area Converter
Bi-directional conversion between AWG, circular mils, metric cross-sectional mm², and solid vs stranded overall outer diameter.
Payload & Weight
Battery Cable Copper Weight Calculator
Calculate net copper weight, total harness insulation mass, and scrap metal value across heavy battery bank wiring runs.
DC Quick-Disconnect
Anderson SB Series Connector & Contact Sizer
Select multipole SB50 to SB350 housings, voltage mechanical color keys (12V to 80V), contact barrel IDs, reducing bushings, and UL 1977 hot-plug ratings.
Ferrule Standards
Wire Ferrule DIN Color Code & Crimper Sizer
Bootlace ferrule sizer per DIN 46228-4 with 3-way color matrix (DIN, German, French), single vs twin sleeves, strip lengths, and crimper die profiles.
Cable Mechanics
Fine-Strand Welding vs THHN Wire Converter
Compare Class K/M flexible welding and marine wire vs Class B THHN: packing factors, bundle diameter expansion (+8% to 15%), and NEC 110.14(C) lug fit.
RF Communications
Marine VHF & AIS Coaxial Cable Loss Calculator
Calculate transmission line attenuation (dB loss), power delivered to the antenna, and Effective Radiated Power (ERP) across RG-58, RG-8X, RG-213, and LMR-400.
Conductor Sizing Standards
Calculated voltage drop uses nominal uncoated-copper conductor resistance at 75°C (167°F), based on NEC Chapter 9, Table 8. The ampacity reference uses ABYC E-11 Table 6B assumptions. Actual installations can differ because of conductor construction, operating temperature, installation conditions, terminations, equipment requirements, and applicable standards.
This calculator provides an educational sizing reference. It is not system-specific engineering certification, code-compliance determination, or a guarantee of installation safety.