Does a 140W charger guarantee 100W plus 40W on two ports?

No. The total rating and the exact simultaneous port-allocation table are separate constraints. Verify the charger's published port-combination table.

Plan before you buy

What USB-C charger do you need for all your devices?

Q: Do I just add the wattage of every device?

Only if you want all selected devices to receive their target power at the same time. If you charge one device at a time, the highest single-device target is the relevant total-power floor.

Pick up to three source-backed device presets — or enter your own targets. WattageFit turns them into a minimum charger shopping spec: total power budget, strongest single port, port count, protocol requirements and cable guidance.

This planner sizes a charging setup from rated targets. It does not recommend a specific product and cannot know a charger's real multi-port split unless you verify the manufacturer's port-allocation table.

Choose your devices

Preset targets come from the same manufacturer-sourced database used by WattageFit's device checker.

Device 1

Device 2

Device 3 (optional)

How will you charge them?

Charging goal

Extra total-power headroom

USB-C ports you want available

What the planner adds

Different question, different tool

The main WattageFit checker tests one existing charging path. This planner works in the opposite direction: start with several devices and derive the charger specification you should look for.

Total budget

Simultaneous charging needs enough total power for all selected targets. One-at-a-time charging only needs to cover the highest target.

Per-port requirement

A charger's headline total is not enough. At least one port must meet the strongest device's target, and simultaneous port combinations must match your plan.

PPS, EPR and cables

The result flags PPS-dependent devices, EPR requirements above 100W and which device paths need more than a basic 60W cable.

How to use the result when comparing chargers

First match or exceed the calculated total budget. Then check the manufacturer's port table for the exact combination you need — for example, whether two connected USB-C ports can actually deliver 96W + 40W at the same time. Finally, confirm the required protocol and use a cable whose power rating supports each device path.

Standards reference

Protocol terminology follows USB-IF guidance for USB Power Delivery and Extended Power Range. See USB-IF — USB Charger / Power Delivery ↗ and USB-IF — Cables and Connectors ↗.

Manufacturer documentation overrides this planning model when it publishes a device-specific requirement or a charger-specific multi-port allocation table.

FAQ

Do I just add the wattage of every device?

Only when you want all selected devices to receive their target power simultaneously. For one-at-a-time use, the highest single-device target is the relevant total-power floor.

Does a 140W charger guarantee 100W + 40W on two ports?

No. A 140W total rating does not tell you the simultaneous port split. A charger might use 100W + 40W, 90W + 45W, 70W + 70W or another allocation. Verify the exact combination table.

When do PPS or EPR matter?

PPS can be required for some phones' advertised fastest charging. USB PD EPR is required for USB-C targets above 100W. The planner flags either condition when a selected preset needs it.