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Electrical Workbench — Free Voltage Drop & Wire Size Calculators
Free electrical calculators: voltage drop (volts, percent and ampacity check) and wire size (AWG recommendation from current, distance and voltage). No login...
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82 % |
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ElecCalcs — Electrical & Mechanical Calculators
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81 % |
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JobsiteWire — Free Electrician Calculators
Free electrician calculators built for the jobsite: voltage drop, wire size, conduit fill, box fill and EV charger circuits. Fast, mobile-first, no signup.
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80 % |
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Jean Measurement Chart: Waist, Hip and Inseam Finder
Jean measurement chart with waist, hip, inseam and rise tips, plus a size finder that suggests women’s and men’s jean sizes from your measurements.
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78 % |
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Solar DIY Project - Small solar, sized with math you can check.
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76 % |
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Online calculators for electronics | MustCalculate
Collection of high quality online calculators for electronics hobbyist and professionals
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76 % |
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76 % |
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ConduitLab — NEC Calculator with Conduit Fill Visualizer
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76 % |
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Free Electrical Calculators for Electricians | Ampxa
Free electrical calculators: voltage drop, conduit fill, box fill, Ohm's law, ampacity, breaker and fuse sizing, motor current, transformer and generator siz...
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76 % |
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NEC Tables — Conduit Fill, Ampacity & Electrical Calculators
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75 % |
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NEC Voltage Drop Calculator — full math shown | VoltDrop
Free voltage drop calculator for copper and aluminum wire. Plain-English inputs, one-way distance (we double it for you), instant green/yellow/red verdict ag...
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75 % |
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Electrical calculators: wire size, voltage drop, Ohm’s law - Voltacalc
Free electrical calculators for wire size, voltage drop, Ohm’s law, amps and watts, breaker size and resistor colour codes. AWG and mm², single- and three-ph...
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75 % |
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Electrical & HVAC Calculators With Code Shown
Free home electrical and HVAC calculators with the math shown: voltage drop, wire size, breakers, BTUs, mini splits, generators, and solar sizing.
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75 % |
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Electrical Charts & Calculators | ElectricalCharts
Free voltage drop, conduit fill and ampacity calculators plus wire gauge, sheet metal, rebar, socket and thread charts. Formula-derived, sources shown.
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74 % |
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CalcWiz | Electrical Calculations Made Easy
CalcWiz makes common electrical calculations faster, clearer and easier to document.
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74 % |
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ToolboxMath — Free Trade Calculators: HVAC, Electrical, Concrete, Framing
Free field calculators for the trades: BTU sizing, wire size, voltage drop, concrete yards, rebar, stair stringers, roof pitch, drywall and more. Fast, mobil...
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74 % |
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Electronics Architect — Power Tree Design and Analysis
Draw a power tree and every rail is solved as you draw: voltage, current, loss, efficiency and the warnings you would otherwise find on the bench. Monte Carl...
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74 % |
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AmpSizer - Wire Size & Ampacity
Wire size, ampacity, voltage drop and conduit fill calculators built on published 2023 NEC tables, from 14 AWG to 2000 kcmil in copper or aluminum.
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74 % |
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Off-Grid Solar Sizing Tools
Calculators for off-grid, RV and marine solar that show every loss factor they apply and size to winter sun rather than the annual average.
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74 % |
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Voltage Drop, Wire Size & Solar Calculators | PowerTotals
Use electrical calculators to compute wire voltage drop and size, power, energy cost, battery runtime, solar sizing, motor current, and circuit values.
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73 % |
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