CMA Calculator
Calculate the circular mil area (CMA) of a wire bundle by entering quantities for each gauge of wire. Supports AWG and mm² - mix and match. See total CMA and the nearest equivalent gauge reference instantly.
Use this tool to determine the correct sizes splice for your bundle. CMA and nearest gauge (both AWG and mm²) are both displayed. Splices are either sized by gauge or CMA, this handy tool converts the numbers for you.
| Gauge | Qty | CMA ea. | Row Total | |
|---|---|---|---|---|
| 642 | - | |||
| 1,022 | - | |||
| 1,624 | - | |||
| 2,580 | - | |||
| 4,110 | - | |||
| 6,530 | - | |||
| 10,380 | - |
Total CMA
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enter quantities above
Nearest AWG
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Nearest mm²
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Recommended Parallel Splice
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Common Parallel Splice Sizes
Select the splice whose CMA range contains your bundle total. If your bundle falls between sizes, use the next larger splice and pack it with additional wire.
| Splice size | Min CMA | Max CMA |
|---|---|---|
| 22–18 AWG | 642 | 1,624 |
| 16–14 AWG | 2,583 | 4,110 |
| 12–10 AWG | 6,530 | 10,380 |
| 8 AWG | - | 16,510 |
| 6 AWG | - | 26,250 |
| 4 AWG | - | 41,740 |
| 2 AWG | - | 66,370 |
Corsa Technic F-Crimp Splices
Tyco/AMP F-crimp terminals stocked by Corsa Technic. Five sizes span 400–12,500 CMA.
| Size | Min CMA | Max CMA |
|---|---|---|
| FCS-1 | 400 | 1,300 |
| FCS-2 | 1,200 | 2,600 |
| FCS-3 | 1,500 | 5,000 |
| FCS-4 | 4,000 | 9,000 |
| FCS-5 | 7,000 | 12,500 |
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What is CMA?
CMA (Circular Mil Area) is the cross-sectional area of a conductor expressed as the area of a circle with a diameter of 0.001 inch (1 mil).
CMA from diameter (inches)
CMA = (d × 1000)²CMA from area (mm²)
CMA = A × 4,000,000 / (π × 25.4²)CMA is widely used in aviation and automotive wiring to verify that a bundle of conductors has sufficient cross-section for a given current load. Standards such as AS50881 specify minimum CMA requirements per ampere of current.