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Conduit Fill Calculator Tools
Don’t want to do manual calculations with the Conduit Fill Calculator? This free Conduit Fill Calculator is designed for electrical engineers and contractors. It offers fast online calculations and real-time feedback, improving your work efficiency. You can also copy results with one click. Try it now!
Calculadora de preenchimento de conduíte
Live conduit fill calculations. Default reference allowed fill: 1 conductor = 53%, 2 = 31%, 3+ = 40% — guidance only; verify local code.
Conduit
Conductor (single)
Allowed Fill / Options
⚠️Disclaimer (based on NEC reference)
This conduit fill calculator and tables are provided for informational and educational purposes only. All dimensions and conductor sizes are approximate and may vary by manufacturer. Results are based on general NEC (National Electrical Code) guidance (e.g., 53% for 1 conductor, 31% for 2 conductors, 40% for 3 or more), but local codes, standards, and engineering requirements may differ. This tool should not be used as a substitute for professional design, official NEC tables, or manufacturer specifications. Always verify conduit and conductor dimensions with certified data before installation. Use of this calculator is at the user’s own risk.
Extra Electrical Conduit Information
Tabela de diâmetro interno de eletrodutos EMT e PVC
| Tamanho do comércio | Diâmetro interno EMT (pol / mm) | Diâmetro interno do PVC Sch 40 (pol / mm) | Área da seção transversal (pol² / mm²) |
|---|---|---|---|
| 1/2″ | 0,622 pol (15,8 mm) | 0,622 pol (15,8 mm) | 0,304 pol² (196 mm²) |
| 3/4″ | 0,824 pol (20,9 mm) | 0,785 pol (19,9 mm) | 0,534 pol² (345 mm²) |
| 1″ | 1,049 pol (26,6 mm) | 1,029 pol (26,1 mm) | 0,865 pol² (559 mm²) |
| 1-1/4″ | 1,380 pol (35,0 mm) | 1,360 pol (34,5 mm) | 1,497 pol² (966 mm²) |
| 1-1/2″ | 1,610 pol (40,9 mm) | 1,590 pol (40,4 mm) | 2,036 pol² (1.316 mm²) |
| 2″ | 2,067 pol (52,5 mm) | 2,047 pol (52,0 mm) | 3,357 pol² (2.169 mm²) |
THHN OD Chart
| AWG Size | Conductor OD (in / mm) |
|---|---|
| 14 AWG | 0.111 in (2.82 mm) |
| 12 AWG | 0.130 in (3.30 mm) |
| 10 AWG | 0.164 in (4.17 mm) |
| 8 AWG | 0.216 in (5.49 mm) |
| 6 AWG | 0.262 in (6.65 mm) |
| 4 AWG | 0.333 in (8.46 mm) |
| 3 AWG | 0.346 in (8.79 mm) |
| 2 AWG | 0.384 in (9.75 mm) |
| 1 AWG | 0.431 in (10.95 mm) |
| 1/0 AWG | 0.484 in (12.29 mm) |
| 2/0 AWG | 0.530 in (13.46 mm) |
| 3/0 AWG | 0.585 in (14.86 mm) |
| 4/0 AWG | 0.646 in (16.40 mm) |
Perguntas frequentes
O preenchimento do conduíte é a porcentagem de espaço dentro de um conduíte ocupada por condutores. O preenchimento excessivo pode causar superaquecimento e dificultar a passagem dos fios.
Comparando a área da seção transversal de todos os condutores com a área disponível do conduíte.
A NEC recomenda preenchimento máximo: 53% para 1 condutor, 31% para 2 condutores e 40% para 3 ou mais condutores.
Always use the insulated outside diameter for accuracy.
Yes, because the inner diameters differ by conduit type.
Yes, but you must calculate the area of each conductor separately and sum them.
Convert conductor and conduit diameters to the same unit system before calculating.
They are a general NEC guideline, but always confirm with local code or engineering requirements.
It may violate code, increase pulling tension, damage insulation, or cause overheating.
No — it’s a quick reference tool. Always verify with official code and manufacturer data.