Choosing a Travel Adapter or Converter

A travel adapter changes the shape of your device’s plug so it fits a foreign wall socket, but it does not change the electricity. The device receives whatever voltage the socket supplies. Voltage is the electrical pressure of the supply, and countries use different standard voltages. A converter is a separate device that changes the voltage itself.

Most phones, laptops, and camera chargers accept a wide voltage range, so an adapter is usually enough. Hair dryers, straighteners, and other single-voltage appliances need a converter or a dual-voltage replacement. Check the label on each device before you pack to see which group it falls into.

Plug Types by Destination

Each plug type has a letter, and one letter can cover a plug that looks different from the version used in another country. The International Electrotechnical Commission publishes the standard for AC plugs and sockets, which first appeared in 1986 and defines a plug designated Type N. Only a few countries have adopted standards closely based on it. As of March 2025, South Africa and Paraguay had done so, and installation is mandatory only in South Africa. Most other countries use plug designs that predate or sit outside that standard.

The table below gives the plug types and mains voltages most commonly listed for popular destinations. Use it as a starting point and confirm each entry with the official source before you travel.

Continental Europe is the simplest region for a traveler from the United Kingdom. Electrical Safety First, a UK charity that publishes safety advice for travelers, states that continental Europe has the same voltage and frequency as the UK, so a UK traveler needs only a travel adapter there. Across much of the rest of the world, the plug type changes from one country to the next, even when the voltage matches. The European Union does not regulate domestic plugs and sockets, which is one reason the plug types vary across the continent.

Because the letter codes are shorthand, check each destination against the official IEC World Plugs registry before you buy. A single letter can hide a difference in pin size or grounding.

Adapters and Converters Do Different Jobs

A plug adapter is a passive piece of hardware with no electronics. It moves the electrical connection from one plug shape to another. A voltage converter is a transformer-type device that steps the voltage up or down. It is heavier and costs more. The converter also has a wattage rating, and the connected device must not exceed it. The travel adapter or converter question is answered by reading the device’s voltage input range.

Consider a laptop charger labeled for 100 to 240 V. Plugged into a 230 V socket in Germany through a simple adapter, the charger receives 230 V and works within its range. A 120 V-only hair dryer plugged through the same adapter receives 230 V, which is almost twice what it was built for, and an adapter cannot prevent that. The adapter only fixes the fit. The device still needs its voltage matched.

Dual-voltage devices are the reason most travelers carry only adapters. Phones, tablets, laptops, cameras, and USB chargers generally accept a range of voltages, so an adapter is enough for them. Many CPAP machines are also dual voltage, but the manufacturer’s label and manual decide that for each model. Medical equipment should follow the manufacturer’s written guidance or advice from a clinician, not a general travel rule.

Reading a Dual-Voltage Label

You can usually find the voltage printed on the power brick, the charger, or the device itself. Most labels use a single line, such as "INPUT: 100-240V ~ 50/60Hz". The word INPUT marks the specification for the power the device draws from the wall socket. Labels on phones, laptops, tablets, and cameras commonly follow this format, as voltage guides describe.

The label falls into one of four patterns:

• 100-240 V, 50/60 Hz: The device accepts both common mains voltages. An adapter is enough for voltage.
• 120 V, 60 Hz only: Countries that supply 230 V require a step-down converter for this device.
• 220-240 V, 50 Hz only: The device needs a step-up converter in countries that supply 110 V.
• A switch marked 110-120 V or 220-240 V: You can switch it manually. Set the switch to match the local voltage before you plug it in.

Some labels list amps but not watts. In that case, multiply the voltage by the amps to get watts. For a device rated at 2 A on a 230 V supply, the figure is 460 W. That watt figure is what a converter has to handle.

What a voltage range covers

A printed range such as 100-240 V describes what the power supply accepts. It is not blanket approval for every outlet. Frequency, plug shape, grounding, and any manufacturer restriction still apply. A US phone charger labeled 100-240 V can use a simple adapter in Germany. A US hair dryer labeled 120 V cannot, even with an adapter, because it has no range to cover 230 V.

The label on the device carries more weight than the power brick. If the two disagree, follow the device label and check the manufacturer’s instructions. One 12 V DC power supply shows a plate reading of 100-240 V and a technical documentation range of 90-264 V. Labels and datasheets can give different figures for the same product, so the printed plate on the unit you own is the figure to trust.

Choosing a Converter Size

Single-voltage heat appliances are the main reason travelers buy converters. Hair dryers, straighteners, curling irons, travel irons, and kettles usually need a converter or a dual-voltage replacement. Converters are bulky and heavy, and they are less reliable for continuous use. For that reason, experienced travelers often buy a dual-voltage version of a heat tool and leave the single-voltage one at home. Some budget travel hair dryers carry a dual-voltage label but are rated only for short-term use at 240 V, and they can overheat under longer use. Read the rating on the tool, not just the label on the box.

Published sizing advice varies. Allianz suggests buying a converter rated about two or three times the device’s wattage. Other guidance suggests rating the converter at least 125 percent of the device’s wattage, or 25 to 50 percent above it to cover the surge when a motor starts. None of these rules comes from a standards body, a government agency, or a manufacturer. Use them as a range, and aim for a converter that comfortably exceeds the wattage printed on the device.

A converter kit listing states a 1875 W rating and describes its use for travel appliances. A retail rating is the seller’s claim. Compare any converter’s rating with the wattage on your device before you buy.

Brazil’s Plugs and Two Voltages

Brazil uses one plug standard across two mains voltages, which makes it an exception to the usual one-voltage pattern. The plug is defined by NBR 14136, the Brazilian technical standard, and it has three cylindrical pins in a Y layout: two for live and neutral and one for earth. The standard has two ratings. The 10 A version uses pins 4.0 mm across, and the 20 A version uses pins 4.8 mm across. The different pin sizes stop high-draw equipment from being plugged into low-capacity sockets.

Compatibility works in one direction. A 10 A socket accepts 10 A plugs and Europlugs, which are the two-round-pin plugs common across continental Europe. A 20 A socket accepts 10 A plugs, 20 A plugs, and Europlugs. A traveler with a Europlug can use a 10 A or 20 A Brazilian socket, but a plug with an unsupported rating does not fit the larger socket. Check the amp rating of any adapter against the sockets you plan to use.

The voltage is the harder issue. Brazil supplies 127 V or 220 V, depending on location, and both can exist in the same city and household. Many devices accept both voltages automatically or through a switch, so check the device label before you assume a converter is needed. Adapters sold in Brazil are often described as Inmetro-approved, and the Inmetro certification mark is the one to look for on the product. Brazilian certification guidance gives 2010 as the year certification became compulsory. Confirm the current rule with Inmetro before you rely on that date.

Safety Standards and Certification Marks

Electrical Safety First gives several practical rules. If an appliance or its power supply is marked dual voltage, no converter or transformer is needed. If the supply voltage differs and the appliance is not dual voltage rated, a converter is required. Adapters should not exceed their rated amps or watts. The charity also warns that a clock designed for 50 Hz may run fast on a 60 Hz supply, so an appliance can run and still work incorrectly. Outside Europe, UK electrical products may not be safe to use without a converter or transformer, according to the charity.

The charity also advises buying adaptors and converters before departure, because some products sold abroad may not meet UK safety standards. It does not recommend buying electrical products abroad for UK use unless the plug has been converted, because of fire and shock risks. The BS 8546 standard applies to travel adaptors sold in the UK, and it does not apply to adapters bought in other markets.

IEC 61558 is a general safety standard for transformers and power supplies, not a standard for travel converters. The ASME summary of IEC 61558 describes its scope as input voltages up to 1000 V AC and source frequencies up to 500 Hz. The 2021 edition of IEC 61558-2-16 covers switch-mode power supplies up to 1 kVA or 1 kW of rated output. Those figures define what the standard covers. They do not tell you which travel converter is safe for a given hair dryer.

Testing marks such as UL, ETL, and CE indicate that an independent body tested a product, but no official list maps these marks to travel converters by country. Treat a mark as one useful signal and check the product’s labeling for the rating that matters to your device.

What to Do Before You Leave

First, list each country on your route with its plug type and voltage, taken from that destination’s official source. Next, read the input label on every device you plan to carry, including the power brick and the device itself. Mark each device as dual voltage or single voltage. A dual-voltage device needs only an adapter that fits the local socket and matches the amp rating.

Single-voltage heat tools need a decision. Replacing a hair dryer or straightener with a dual-voltage model is often simpler than carrying a converter, which is bulky and less reliable for regular use. If you must carry a converter, choose one rated comfortably above the wattage on the device label, and buy it before departure. Check the entry rules and customs guidance for each country through the destination’s official embassy or border agency pages, because those rules change and no general travel guide replaces them.

Pack a spare adapter that matches your route, and keep the device labels in view when you plug in. If a label is unclear, check the manufacturer’s manual or website before you connect the device.

Key Takeaways

• Check the input label on each device: Dual-voltage labels, such as 100-240 V, cover the voltage range. Frequency, plug shape, and any manufacturer limit still need checking.
• Carry adapters for plug shape only: An adapter fits the plug to the socket and does not protect a device from a voltage mismatch.
• Replace single-voltage heat tools before you leave: Hair dryers, straighteners, and kettles usually need a converter or a dual-voltage replacement. Converters are bulky and less reliable for continuous use.
• Size any converter above the device wattage: To get watts, multiply volts by amps, and choose a converter rated above that figure because published sizing advice varies.
• Verify plug types and voltage for each stop: Check each country in the official IEC World Plugs registry. Confirm Brazil’s certification rules with Inmetro before you buy.