24V Wire Size Calculator
Cable cross-section for a 24 volt DC run so voltage drop stays under your limit.
Compare Your Options And Get Clear Answers
Cable cross-section for a 24 volt DC run so voltage drop stays under your limit.
24V Wire Size Estimator
Enter your numbers below for an instant estimate.
How It Works
Key concepts behind this calculator
Enter Values
Fill in each field with your own numbers.
Calculate
Results update as you change the inputs.
Review
Read the breakdown and the explanation.
Adjust
Change values to compare scenarios.
24V Quick Guide
Typical values for reference.
| Current | Length | Max drop | Size |
|---|---|---|---|
| 5 | 5 | 3 | 1.50 mm2 |
| 10 | 10 | 3 | 6.00 mm2 |
| 20 | 10 | 3 | 10.00 mm2 |
| 20 | 30 | 3 | 35.00 mm2 |
| Rule of Thumb | Check inputs | Use as a guide | Round sensibly |
24V Wire Size Calculator FAQ
Answers to common questions about this calculator.
Lower voltage means higher current for the same power, so drop is a bigger share.
No. It is for low-voltage DC only.
Area = 2 x 0.017241 x length x current / (allowed drop in volts).
It is an estimate based on the inputs you enter. Check real quotes, labels or official guidance for important decisions.