PlugVoltage

Travel power guide

Step-Up vs Step-Down Converters

Direct answer

Step-Up vs Step-Down Converters

A step-down converter lowers high voltage (e.g. 230V → 120V) for a low-voltage device; a step-up converter raises low voltage (120V → 230V) for a high-voltage device.

Travelers from the US (120V) visiting Europe/Asia (230V) usually need a step-down converter for single-voltage gear.

Travelers bringing 230V appliances to the US/Japan need a step-up converter, though most modern electronics are dual voltage and need neither.

Either way, the converter must be rated above your device draw; PlugVoltage uses a conservative 25% headroom rule.

Direction examples

Step-up vs step-down by trip direction

Pick the converter direction from destination voltage, not from plug shape.

US to Germany A 120V-only device on a 230V grid needs step-down, but heating devices are still poor candidates.
UK to United States A 230V-only device on a 120V grid needs step-up if it is worth traveling with at all.
Dual-voltage charger A 100-240V charger needs neither direction; use only the right plug adapter.
Exact trip check

Check your own device, label, and destination before you pack.

Open the checker

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Guidance only — not professional electrical advice. Always confirm against your device's label before plugging in. Local wiring (especially in hotels and older buildings) can vary.