🔄 Unit & Currency Converters

Unit & Currency Converters

Q: How many pounds is 1 kilogram?

1 kilogram equals 2.205 pounds. Conversely, 1 pound equals 0.454 kilograms. The unit converter handles this and all other weight conversions between kg, lb, oz, stone, and grams.

Q: What's the difference between US and imperial gallons?

A US gallon is 3.785 litres; an imperial UK gallon is 4.546 litres, about 20% larger. This matters for fuel efficiency comparisons. The unit converter distinguishes between the two.

4 free converters for units of measurement and currency. Length, weight, temperature, volume, and live exchange rates — all free, fast, and accurate.

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🔄 Unit & Currency Tools

What Are Unit & Currency Converters?

Unit and currency converters translate between different systems of measurement and different currencies. Whether you’re converting kilometres to miles, kilograms to pounds, Celsius to Fahrenheit, or US dollars to euros, these tools give you an instant, accurate result. They’re used daily by travellers, students, engineers, cooks, shoppers, and anyone dealing with measurements or money across borders or systems.

Unit Converter

The unit converter handles conversions across all major measurement categories: length, weight and mass, temperature, volume, area, speed, time, data storage, energy, and more. Enter a value in one unit and it converts to all related units instantly. It covers both metric and imperial systems, making it useful whether you’re working in metres or feet, litres or gallons, Celsius or Fahrenheit.

Common conversions:
1 mile = 1.609 km
1 kg = 2.205 lb
1 litre = 0.264 US gallons
°F = (°C × 9/5) + 32
1 inch = 2.54 cm

Currency Converter vs Live Currency Converter

NerdyTools has two currency tools that serve slightly different needs. The currency converter covers a broad range of world currencies for everyday conversions. The live currency converter pulls its rate directly from the European Central Bank’s daily reference rates in real time when you click convert — no stale embedded table — and is the better choice when you specifically need to know how current the rate is, such as before an international transfer or payment. Both are free and run entirely in your browser.

💡 Exchange rates from converters are mid-market rates — the “real” rate between two currencies. Banks and money transfer services typically add a margin of 1–5% on top. When comparing transfer services, use the mid-market rate from the converter as your benchmark to see how much markup each provider is charging.

When You Need a Converter

Travel: converting currencies, understanding distances in unfamiliar units, and adapting recipes from metric to imperial or vice versa.
Shopping internationally: comparing prices across countries in your home currency.
Cooking: converting between cups, tablespoons, millilitres, ounces, and grams.
Science and engineering: converting between SI and other unit systems.
Fitness: converting body weight between kg and lb, distances between km and miles. See also the BMI calculator and pace calculator, which handle unit conversions internally.
Business: invoicing in foreign currencies, converting between data units (MB, GB, TB) for cloud budgeting.

Metric vs Imperial

Most of the world uses the metric system (metres, kilograms, litres, Celsius), while the United States primarily uses the imperial system (feet, pounds, gallons, Fahrenheit). The UK uses a mix — miles for road distances but metres in construction, stones and pounds for body weight but kilograms in medicine. This patchwork is why unit converters are one of the most-used tools on the internet. Our unit converter handles both systems and all the crossovers between them.

Understanding Exchange Rates

An exchange rate is the price of one currency expressed in another. When you see “1 USD = 0.92 EUR,” it means one US dollar buys 0.92 euros. Rates are set by global foreign exchange markets and change constantly based on economic data, interest rates, geopolitics, and market sentiment. The live currency converter fetches live ECB reference rates so your conversion reflects the current published market rate, not an outdated figure.

Related Tools

Conversions often come up alongside other calculations. The percentage calculator is useful for working out markups, discounts, and exchange rate margins. The fuel cost calculator converts between MPG and L/100km internally. The salary to hourly calculator converts annual pay to hourly rates. And the number base converter handles a different kind of conversion — between decimal, binary, hexadecimal, and octal number systems.

Frequently Asked Questions

How do I convert Celsius to Fahrenheit?

Multiply the Celsius temperature by 9/5, then add 32. For example, 25°C = (25 × 1.8) + 32 = 77°F. The unit converter does this instantly for any temperature, along with Kelvin.

What’s the difference between the two currency converters?

The currency converter covers a broad range of world currencies for general use. The live currency converter fetches its rate directly from the European Central Bank in real time each time you convert, which is useful when you specifically need to know the rate is current.

Are the exchange rates live?

Yes. The live currency converter fetches the current published ECB reference rate each time you convert. Rates update once per business day. For large transactions, always confirm the rate with your bank or transfer service, as they apply their own margin.

How many pounds is 1 kilogram?

1 kilogram = 2.205 pounds. Conversely, 1 pound = 0.454 kilograms. The unit converter handles this and all other weight conversions between kg, lb, oz, stone, and grams.

What’s the difference between US and imperial gallons?

A US gallon is 3.785 litres; an imperial (UK) gallon is 4.546 litres — about 20% larger. This matters for fuel efficiency comparisons: 30 MPG (US) is about 36 MPG (imperial). The unit converter distinguishes between the two.

Can I convert multiple units at once?

Yes. Enter a value in any unit and the converter shows the equivalent in all related units simultaneously — so one entry gives you metres, feet, inches, centimetres, kilometres, and miles all at once.

Are these tools free?

Completely free, no sign-up, unlimited use. They run in your browser and work on any device. Your data is never stored or shared.

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