Wire Gauge Calculator
Calculate AWG or mm2 wire size, voltage drop, and recommended fuse ratings for 12V, 24V, and 48V DC systems.
Open Wire CalculatorVoltPlan Tools
Electrical calculators built for 12V systems
Use VoltPlan's free calculators to size wire, fuse protection, and voltage drop for campers, boats, RVs, and off-grid solar builds.
Fuse Size Calculator
Size blade, MAXI, ANL, and Class T fuses based on watts, amps, voltage, and cable length.
Open Fuse CalculatorLearn the reasoning behind the numbers
The calculators are faster when you already understand the tradeoffs. These guides cover fuse placement, marine wiring layouts, solar sizing, and cable selection in more depth.