Map Your Days
Travel power planning

Check whether one charger can cover every device.

Compare the real multi-port allocation, each device target and every cable limit before replacing several travel chargers with one.

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Travel charger capacity checker

Check whether one multi-port USB-C charger can support your travel devices at the same time. Enter the exact combined-use allocation from the charger manual, each device target and each cable limit. Nothing is uploaded or saved.

Use the manufacturer’s total output while the selected ports are in use, not the maximum for one port by itself.
Device 1
For example, work laptop or phone.
Use the documented charging input you want to support.
Use this port's value when all listed ports are connected.
Use the marked or documented limit for this exact cable.
Device 2
For example, work laptop or phone.
Use the documented charging input you want to support.
Use this port's value when all listed ports are connected.
Use the marked or documented limit for this exact cable.
Device 3
For example, work laptop or phone.
Use the documented charging input you want to support.
Use this port's value when all listed ports are connected.
Use the marked or documented limit for this exact cable.

Ready when you are

Use one combined-use row from the charger manual.

The example starts with a 100 W charger split 65 W, 20 W and 15 W. Check it as shown, or replace every value with your own setup.

What this checker does not know

It does not identify a charger, read USB Power Delivery profiles, test protocol compatibility, inspect a cable, measure battery state or estimate charging time. Some chargers also redistribute power when a device connects or disconnects. Confirm the exact port combination in the manufacturer documentation.

A device may work below its target but charge slowly or lose battery during heavy use. Keep a small backup adapter when one charger would otherwise become a single point of failure for essential devices.

Avoid the headline-wattage trap

Total wattage does not tell you what every port receives.

Multi-port chargers can redistribute power when several devices are connected. The useful input is the manufacturer’s exact row for the port combination you will use, followed by the limit of each cable.

Copy the combined-use row

Find the manufacturer's allocation table for the exact ports you will use together. Do not add the advertised single-port maximums.

Set a target for each device

Use the documented charging input you want available. A laptop under heavy use may need more power than it needs while asleep.

Check every cable

A capable charger and port cannot deliver more than the connected cable supports. Use the marked or documented cable rating.

Primary references

USB-IF guidance behind the check.

These official USB Implementers Forum references were checked on September 21, 2026. Your charger manual remains the authoritative source for its port allocation table.

Packing the rest of the trip?

Build a checklist for documents, devices and departure day.

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