110v vs 220v: The Essential Guide Before Moving Overseas

People get caught off guard by this all the time. Someone moves overseas, unpacks the coffee machine they’ve used for years, plugs it in, and suddenly it either barely works or stops working altogether. Not because the appliance was bad. The electricity coming out of the wall was different from what it was built for.

That’s really what 110v vs 220v comes down to. Same appliances, same plugs sometimes, completely different power behind them.

110V and 220V: The Global Voltage Standards Every Expat Needs to Understand

Two electrical systems run the world. They don't get along. Plug a US appliance into a European outlet without the right equipment, and you'll find out the hard way. Before anything gets plugged in, you need to know which system you're on.

110V (Also Written as 120V): North America's Standard

The US, Canada, Mexico, and a handful of Caribbean islands run on 110 to 120 volts at 60Hz. That's what every appliance sold at an American retailer is designed around. Buy a blender in Chicago, a toaster in Toronto; it's built for this, full stop.

• Outlets deliver 110 to 120 volts
• Frequency is 60Hz
• Most US and Canadian appliances are single-voltage, and not every device actually needs a converter when you travel or relocate

"110V" and "120V" mean the same thing. The number crept upward over the years as power grids got more efficient. You'll see both on packaging, both on spec sheets; don't overthink it. If you're heading to a 220V country and packing US appliances, you'll need a voltage converter before those appliances touch a foreign outlet.

220V (Also Written as 230V or 240V): The Standard Across Most of the World

Move to Nigeria, Ghana, Germany, or the UK, and your walls are running on 220 to 240 volts at 50Hz. That's the case across Europe, Africa, most of Asia, the Middle East, Australia, and the bulk of South America. We stock 220V major appliances built specifically for customers relocating to these regions.

• Outlets deliver 220 to 240 volts
• Frequency is 50Hz
• Covers the UK, Germany, Nigeria, Ghana, India, Australia, and most of Europe and Africa

"220V," "230V," and "240V" are all the same system. Different countries landed on slightly different numbers over the years, but electrically, there's no meaningful distinction between them.

The Core Problem: These Two Systems Are Not Compatible

Voltage is electrical pressure. A 220V outlet pushes twice the pressure of a 110V outlet. That gap isn't something you can ignore.

• 110V device into a 220V outlet: Double the voltage slams circuits that weren't built for it. The device overheats, short-circuits, and it's done. This is the one that costs people money. A step-down voltage converter between the wall and your appliance is what stops this from happening.
• 220V device into a 110V outlet: Not enough power to run properly. The device either won't turn on or it crawls. Less likely to fry the appliance, but it won't work. A step-up transformer fixes that by bringing US wall power up to what the appliance needs.

Match the voltage before you plug anything in. That's the rule. If you can't match it, a converter goes between the wall and the appliance. Getting the sizing right matters just as much, and the right setup process keeps you from making a second mistake after the first one.

Pro tip: A plug adapter changes the shape of the plug. That's it. It does nothing to the voltage. Using a foreign plug adapter alone to run a 110V appliance in a 220V country sends full overseas voltage into circuits rated for half that. The appliance won't make it. An adapter and a converter are completely different things.

A Quick Note on the Numbers

The labeling trips people up. Keep it simple:

• 110V = 120V: same system, different labe
• 220V = 230V = 240V: same system, different label

Power grids evolved over decades, and nobody got together to align the naming. So both versions stuck. Whatever number appears on your appliance label, match it to your destination country's standard. That's genuinely all there is to it. 

If you're still not sure what applies to your situation, our free relocation consultation is worth a few minutes; we've been working through exactly these questions with customers since 1979.

Which Voltage Does My Destination Use? A Country-by-Country Reference

Don't pack a single appliance before you've checked this. Voltage is what matters most; get it wrong, and the appliance is done, no matter how well the plug fits. So work through it in that order:

• Check the voltage first. Find your destination in the tables below and read the voltage column. This tells you whether you need a converter.
• Then check the plug shape. The plug column tells you whether you also need an adapter to physically fit the socket.

If the voltage already matches your appliance and only the plug shape is different, that's the easy case. One of our foreign plug adapters reshapes the prongs so your device fits the local socket, and we stock one for every plug type in the tables below.

Just be clear on what an adapter does and doesn't do:

• It changes the shape of the plug. Nothing more.
• It does not touch the voltage. So an adapter on its own is only safe when the voltage is already a match.

If the voltage is different, an adapter won't protect you; it just lets the full local voltage reach an appliance that can't handle it. For that, you need a converter.

North America and the Caribbean

The Caribbean is the one region that genuinely trips people up. Looks uniform. Isn't. Grenada is 230V. Trinidad is 115V. St. Lucia is 230-240V. St. Vincent runs both. None of that follows from geography; it follows from which European power built the infrastructure. Your island could go either way. Check it specifically.

Antigua and Barbuda catch people every time. US-style plugs, Type A and B. Same shape as home. But the voltage is 230V. Your appliance fits the outlet and gets fried anyway. The plug fitting doesn't mean the voltage matches. Pack a travel voltage converter if you're heading anywhere in the Caribbean; don't rely on the plug shape to tell you you're safe.

Europe and the United Kingdom

The whole of Europe and the UK is 220-240V at 50Hz. No exceptions. Where it gets complicated is the plug shape. Germany, France, Spain, and most of the continent use Type C/F, the round two-pin Europlug. The UK uses Type G, three rectangular pins. A UK plug won't fit a German socket. They're different standards despite the same voltage.

Africa

220-240V at 50Hz, every country. That part's consistent. The plug types aren't. British colonies went Type G. French colonies went Type C/E. Nigeria and Ghana are Type G. Senegal is Type C/E. South Africa uses Type M, a large, round three-pin you won't find in most places. 

Universal sockets are common in Nigerian and Ghanaian buildings, but don't bank on it.

Asia and the Middle East

Asia is mostly 220-240V at 50Hz, but the exceptions matter. India runs Type D and C, the older British round three-pin. UAE is Type G, British standard. Saudi Arabia breaks from the rest of the region: 220V but running at 60Hz instead of 50Hz, and depending on when a building went up, you might hit 110V or 220V at the same outlet type. 

Japan is its own thing entirely: 100V, the lowest mains voltage of any developed country, and fully incompatible with both US and international appliances unless they're dual-voltage.

Saudi Arabia runs at 60Hz. Almost every other 220V country on earth uses 50Hz. That gap matters if you're running anything with a motor, a compressor, or a clock. On top of that, older buildings may have 110V outlets while newer construction has 220V. Check the outlet, not just the country.

Japan: 100V. Not 110V like the US. Not 220V like Europe. A hundred volts exactly, which puts it below the tolerance range of many US appliances rated at 120V, and far below anything built for 220V. If your device label says 100-240V, you're fine. If it says 120V only or 220V only, you need a converter.

Australia and New Zealand

230V, 50Hz, Type I. That angled three-pin plug is used almost nowhere outside this corner of the world, so US appliances need an adapter for the socket shape and a voltage converter for the voltage itself. Both. Not one or the other. 

The voltage column tells you whether you need a converter. Plug type tells you whether you need an adapter. Two different problems, two different solutions, and a lot of destinations require both. 

One more thing: Nigeria, Ghana, and most of West Africa have grids that fluctuate. The voltage off the wall doesn't stay steady. A standard converter won't protect against that. For those destinations, go with a converter with a built-in stabilizer so your appliances are protected from spikes, not just from the wrong base voltage. 

Why the World Runs on Two Different Voltages (And Why That's Not Changing)

This wasn't a coordinated decision. Two systems developed independently, spread in different directions, and got locked in before anyone thought to align them.

Edison's 110V Grids Set the US Standard

In the 1880s, Thomas Edison wired America's first power grids at 110 volts. His direct current system made 110V the practical standard for the lightbulbs and motors of the era. Cities built around it. Infrastructure followed.

By the mid-20th century, tens of millions of US homes, factories, and appliances were already locked into 110V. Rebuilding all of that at 220V would've cost an enormous amount, with almost no benefit to the average household. So America stayed put. It still is.

Europe Figured Out That Higher Voltage Is More Efficient

Europe's engineers started later, and they had something to work with: the knowledge that higher voltage transmits electricity over longer distances with far less energy wasted in the process.

Running power at 220V meant thinner copper wire, longer transmission lines, and a more efficient grid overall. Britain, Germany, France, and most of the continent standardized at 220 to 240 volts. That's still the number coming out of every wall socket in Berlin, London, and Paris today.

Colonialism Spread the 220V Standard Across Africa and Asia

The colonial era explains the voltage map more than geography does.

• British territories: 220-240V, 50Hz, Type G plugs: Nigeria, Ghana, Kenya
• French territories: 220-240V, 50Hz, Type C/E plugs: Senegal

When Britain wired its colonies, it used the British system. France did the same. That's why Nigeria and Ghana are on 220-240V today, not because of any technical decision made locally, but because of who built the infrastructure first.

The electrical map of Africa and Asia is essentially a record of colonial-era construction.

Neither System Is Going Anywhere

Two systems, over a century of locked-in infrastructure on both sides, and no realistic path to change. A voltage converter isn't a workaround; it's a permanent fact of international life for anyone moving appliances across the 110V and 220V divide.

Your Appliances Need More Than The Right Plug

A lot of people assume the hard part of moving overseas is shipping everything safely. Then the appliances arrive, and suddenly the real problem starts. Different countries run on different voltage systems, different frequencies, and sometimes even different outlet standards within the same region.

That’s why checking compatibility before you travel matters so much. The right converter or transformer can save you from having to replace appliances that were working perfectly fine back home.

If you’re not completely sure what works in your destination country, 220 Electronics can help you figure it out before anything gets plugged in. We’ve been helping travelers, expats, and international homeowners deal with voltage compatibility issues for decades.