Electronics
What Size Is My Laptop Charger Tip?
Calibrate your screen, then compare outer diameter, inner diameter, and optional barrel length against verified round DC connector standards.
Confirm calibration
Calibrate your display for best accuracy before comparing objects.
1. Select connector shape
V1 focuses on round DC barrel connectors with verified dimensions.
Limited identification
2. Compare outer diameter
Place the tip against the circle that matches the outer sleeve.
3. Compare inner diameter
For the same outer size, match the hollow center (or pin opening).
4. Connector length (optional)
Barrel length helps when two tips share OD × ID. Skip if unsure.
Best physical matches
- Outer diameter
- Inner diameter
- Source
Never choose a charger only because the plug fits. Closest standard size is a physical match only.
Compare two outer diameters— side-by-side or overlay
Difference highlight uses calibrated --px-per-mm. Solid = A, dashed = B in overlay.
Can't find what you're measuring?
How to use this checker
- Confirm calibration (credit card recommended).
- Select a round DC barrel shape when that matches your tip.
- Compare outer diameter, then inner diameter on screen.
- Optionally check barrel length.
- Read the closest physical standard, not an electrical recommendation.
Laptop charger tip size: what to compare
Most round DC laptop tips are identified by three physical dimensions: outer diameter (OD), inner diameter (ID), and sometimes barrel length. A tip that fits loosely or fails to seat often mismatches one of those values even when another looks close.
This laptop charger tip size checker draws verified OD × ID pairings at approximately real size after calibration. Use it when the adapter label is missing, worn, or lists a tip code you cannot decode. It does not invent electrical ratings from dimensions alone.
If your tip is rectangular, magnetic, or branded proprietary, stop here and use the manufacturer part number or a known-good adapter. Round barrel results are closest-standard matches only.
Verified DC barrel sizes in this tool
Sizes below come from IEC 60130-10 type definitions and widely published industry OD × ID pairings. Proprietary rectangular laptop tips are not claimed here.
| Size | OD | ID | Source |
|---|---|---|---|
| 5.5 × 2.1 mm | 5.5 mm | 2.1 mm | IEC 60130-10 |
| 5.5 × 2.5 mm | 5.5 mm | 2.5 mm | IEC 60130-10 |
| 6.0 × 2.1 mm | 6.0 mm | 2.1 mm | IEC 60130-10 |
| 6.0 × 2.5 mm | 6.0 mm | 2.5 mm | IEC 60130-10 |
| 3.8 × 1.1 mm | 3.8 mm | 1.1 mm | IEC 60130-10 |
| 6.3 × 3.1 mm | 6.3 mm | 3.1 mm | IEC 60130-10 |
| 3.4 × 1.3 mm | 3.4 mm | 1.3 mm | IEC 60130-10 |
| 3.5 × 1.35 mm | 3.5 mm | 1.4 mm | Industry common |
| 4.0 × 1.7 mm | 4.0 mm | 1.7 mm | Industry common |
| 2.5 × 0.7 mm | 2.5 mm | 0.7 mm | Industry common |
Common questions
How do I measure a laptop charger tip without calipers?
Calibrate your screen first, then compare the tip’s outer diameter (OD), inner diameter (ID), and optional barrel length to verified round DC sizes drawn at approximately real size. Hold the tip flat against the circles—do not guess from a photo alone. Closest-standard match only.
What is OD and ID on a laptop charger tip?
OD is the outer diameter of the barrel sleeve. ID is the inner pin or hollow bore diameter. Both matter for mechanical fit; matching only one dimension is not enough. This tool lists verified OD × ID pairings from common DC barrel standards.
What is the difference between 5.5 × 2.1 mm and 5.5 × 2.5 mm?
Both share a 5.5 mm outer diameter. The difference is the inner diameter: 2.1 mm vs 2.5 mm. From the outside they look nearly identical, so always check ID as well as OD. Use Compare two outer diameters on this page when two candidates look close.
Does finding the tip size mean the charger is electrically compatible?
No. Physical tip dimensions are not an electrical recommendation. Confirm voltage, polarity, and current from the device label or a known-good adapter before connecting power. A tip that fits can still be the wrong supply.
Is the tip size the same as the center pin size?
Not always. OD describes the barrel sleeve; ID describes the center contact or bore. Some connectors also use a center pin on the jack side. Measure the dimensions your tip actually has, then match a verified OD × ID pairing—do not assume one number covers both.
Can I identify a charger tip from a photo?
Photos distort scale and hide the inner diameter. This checker is built for holding the real tip against calibrated on-screen circles. Use a photo only as a rough clue, then verify OD and ID on a calibrated display or with measuring tools.
Are rectangular or proprietary laptop tips included?
No. This tool covers round DC barrel connectors with verified OD × ID pairings. Rectangular, magnetic, or brand-proprietary tips need the manufacturer part number or a known-good adapter.