Estimate DC or single-phase resistive two-wire voltage drop from supply, current, one-way length and conductor area.
01 / CIRCUIT & SUPPLY
02 / CABLE & LIMIT
Nominal resistivity at approximately 20°C; constant temperature and current are assumed. No AC reactance, power factor or installation derating is included. This is not an electrical-code check or wire-size safety recommendation.
03 / YOUR RESULT
04 / CALCULATION
2 × 10 × 10 × 0.0172 ÷ 2.5 = 1.376 V. Drop % = drop ÷ 12 × 100 = 11.4667%. Estimated load voltage = supply − drop = 10.624 V.
Inputs remain in your browser. Nominal cable data is bundled locally; no electrical databases are queried.
Enter the values you want to compare; processing happens in your browser.
Adjust optional settings and review validation feedback before relying on the estimate.
Review the formulas and equivalent values, then copy the result you need.
Select DC or single-phase resistive AC, then enter supply voltage, current, one-way cable length, copper or aluminum and custom mm² area or a local AWG equivalent. Set your own acceptable percentage.
Two-wire round-trip resistive formula, nominal copper/aluminum resistivity, common AWG area lookup and threshold comparison.
The estimate runs in your browser, assumes nominal conductor temperature and does not establish electrical-code compliance or wire-size safety.
Drop in volts equals 2 × current × one-way cable length × nominal conductor resistivity divided by cross-sectional area in mm².
A DC or single-phase two-wire resistive circuit has an outgoing conductor and a return conductor; both contribute to the estimated voltage drop.
Yes. A small bundled lookup fills the approximate cross-sectional area for selected AWG sizes. You can instead enter an area in mm² directly.
It only compares the estimated drop percentage with the threshold you entered. It is not an electrical-code or wire-size safety assessment.
No. The AC option is a simple two-wire resistive approximation at nominal temperature; reactance, power factor and derating are not modeled.
The constant-current approximation is not meaningful at or above the supply voltage, so those inputs show an error rather than a negative load voltage.