port match
A field guide for your charging drawer

Same port.
What about the power?

Read charger and device labels together. Find shared fixed USB PD voltages and a theoretical power ceiling, with the limits spelled out.

LABELS → LIMITS5—20 VFIXED PD ONLY
Try a made-up setup60 W vs 65 W →Cable bottleneck →No shared voltage →140 W / EPR →
01

Charger label

Use one USB-C port’s OUTPUT list. Omit AC input and variable ranges.

Editable profilesV / A
02

Device label

Use the device’s accepted INPUT list, not just the watts on its original charger.

Editable profilesV / A
03

Cable & comparison scope

Use an explicit manufacturer target. It is not assumed to be the minimum needed to operate. Choose Unknown if your cable’s current, voltage or e-marker rating is unclear.

Local calculations. Your labels stay in this tab. Nothing is uploaded.

Your label comparison

A match starts
with the details.

Paste both labels, check the parsed rows, then add the cable rating. The result explains each shared voltage.

A 65 W headline alone cannot tell you whether two fixed voltage lists overlap.
An upper bound, not a charging promise.
Actual charging, speed, safety and authenticity remain unverified.
How to read the result

Three checks. Every condition visible.

01 / THE SAME VOLTAGE

Find a common fixed profile

We intersect only the voltages you enter. A device label may list fewer profiles than it accepts. No missing fallback is invented.

02 / THE EXPLICIT LIMIT

Apply the current limits

At each shared voltage, use the lowest listed charger, device and cable current, plus the cable’s wattage cap. Keep the highest resulting ceiling.

03 / THE UNKNOWN PART

Leave uncertainty in the answer

Unknown cable, missing specs or an EPR setup? The result says so. Lower input may not operate or charge a device; check its manual.

FIELD NOTE 01What does 20V⎓3.25A mean? →FIELD NOTE 02Why is USB-C charging slowly? →

Clear this comparison?

This removes the labels, reviewed rows and result from this tab.

Source notes · checked 22 October 2026
USB-IF: Power DeliveryUSB-IF: fixed supplies (slide 14)USB-IF: cablesEU: common charger background

The EU page supplies context, not proof that every USB-C combination works. This independent tool compares entered labels; it does not certify USB PD compliance.