Fast Everyday Conversions
Aaron's Converter helps you convert common measurements, estimate currency values, and compare times around the world. It is built for everyday use, travel, shopping, study, cooking, and work.
Unit Converter
Convert length, weight, temperature, speed, volume, area, pressure, power, and more.
Currency Converter
Estimate values between AUD, USD, EUR, GBP, JPY, NZD, CAD, and more.
World Time
Check the current time in major cities and compare time zones.
Knowledge Centre
Read plain-English guides about common conversions, time zones, currency rates, and measurement systems.
Unit Converter
Choose matching unit types, such as kilograms to pounds or kilometres to miles.
Want to understand the calculation? Read the Knowledge Centre guides.
Currency Converter
This converter uses live exchange rate data where available. Rates are estimates and may differ from banks or payment providers.
Learn more: How exchange rates work.
World Time
Current local times in popular cities.
Learn more: Understanding world time zones or What is UTC?
Knowledge Centre
Plain-English guides that explain common conversions, measurement systems, currency estimates, and world time. This section adds useful publisher content while keeping the converter tools clean and uncluttered.
Popular Guides
Choose a guide below. Each article opens as a clean page using the same Aaron's Converter theme.
Length
How to Convert Inches to Centimetres
Converting inches to centimetres is one of the most common everyday conversions, especially when comparing product sizes, screen sizes, tools, furniture, c...
Length
Metric vs Imperial Measurements Explained
The metric and imperial systems are two different ways of measuring length, weight, volume, and other quantities. Australia uses the metric system for ever...
Weight
Kilograms vs Pounds Explained
Kilograms and pounds are both used to measure weight or mass, but they belong to different measurement systems. Kilograms are part of the metric system, wh...
Temperature
Celsius vs Fahrenheit: What's the Difference?
Celsius and Fahrenheit are two different temperature scales. Australia uses Celsius for weather, cooking, appliances, and most everyday temperature reading...
Pressure
PSI vs kPa Explained
PSI and kPa are both pressure units. PSI means pounds per square inch and is common in tyre pressure gauges, compressors, and older equipment. kPa means ki...
Power
Horsepower vs Kilowatts
Horsepower and kilowatts are both used to describe power. Horsepower is often used for engines, pumps, compressors, and older machinery. Kilowatts are part...
Energy
Kilojoules vs Calories on Food Labels
Kilojoules and calories are both units of energy. In Australia, food labels usually show energy in kilojoules, while many fitness apps, diet plans, and ove...
Volume
Litres vs Gallons Explained
Litres and gallons are both used to measure volume, but they are not the same. Australia uses litres for fuel, drinks, water tanks, chemicals, and most eve...
Area
Acres vs Hectares
Acres and hectares are both used to measure land area. Hectares are part of the metric system and are common in Australia for farms, rural land, and larger...
Length
Millimetres to Inches for Tools and Parts
Millimetres and inches are commonly used for tools, bolts, brackets, fittings, machinery parts, and product dimensions. Australia generally uses metric mea...
Currency
How Exchange Rates Work
Exchange rates show how much one currency is worth compared with another. For example, an Australian dollar to US dollar rate shows how much USD can be rec...
World Time
Understanding World Time Zones
Time zones allow different parts of the world to use local times that roughly match daylight hours. Without time zones, every town could have a different l...
World Time
What Is UTC?
UTC stands for Coordinated Universal Time. It is the main time standard used around the world for timekeeping, aviation, technology, science, and internati...
World Time
Daylight Saving Time Explained
Daylight saving time is the practice of moving clocks forward by one hour during part of the year. The goal is to shift more daylight into the evening....
Trade
Common Conversions Used in Construction
Construction, fabrication, home improvement, and workshop projects often involve quick conversions between millimetres, centimetres, metres, inches, feet, ...
Cooking
Cooking Measurement Conversions
Cooking conversions are useful when following recipes from different countries. Australian recipes often use metric measurements such as grams, millilitres...
Speed
Kilometres per Hour vs Miles per Hour
Kilometres per hour and miles per hour are both used to measure speed. Australia uses kilometres per hour for road speeds, while the United States and some...
Force
Newtons and Pounds Force Explained
Newtons and pounds force are both used to measure force. Newtons are part of the metric system and are commonly used in science, engineering, tools, spring...
Area
Square Metres vs Square Feet
Square metres and square feet are both used to describe area. Australia commonly uses square metres for rooms, homes, land improvements, flooring, wall cov...
Vehicle
Fuel Economy: L/100km and MPG
Fuel economy can be shown in litres per 100 kilometres or miles per gallon. Australia commonly uses litres per 100 kilometres, while the United States ofte...
General
Why Online Converters Are Useful
Online converters help turn unfamiliar units into measurements that are easier to understand. They are useful for shopping, travel, work, study, cooking, f...
← Back to Knowledge Centre · Length
How to Convert Inches to Centimetres
Converting inches to centimetres is one of the most common everyday conversions, especially when comparing product sizes, screen sizes, tools, furniture, clothing, and imported items. Inches are part of the imperial system, while centimetres are part of the metric system used in Australia and many other countries.
The conversion is simple: one inch equals exactly 2.54 centimetres. To convert inches to centimetres, multiply the number of inches by 2.54. For example, 10 inches equals 25.4 centimetres, and 20 inches equals 50.8 centimetres.
This is useful when shopping online because many overseas listings show measurements in inches. If you are buying cases, screens, brackets, furniture, pet products, gym equipment, or tools, converting to centimetres can make the size easier to picture.
Common examples include a 55 inch TV, a 15 inch laptop, a 6 inch phone screen, or a 12 inch ruler. Each of these can be quickly converted using the Aaron's Converter unit converter.
Quick examples: 1 inch = 2.54 cm, 5 inches = 12.7 cm, 10 inches = 25.4 cm, 50 inches = 127 cm.
← Back to Knowledge Centre · Length
Metric vs Imperial Measurements Explained
The metric and imperial systems are two different ways of measuring length, weight, volume, and other quantities. Australia uses the metric system for everyday measurements, while the United States still commonly uses imperial units such as inches, feet, miles, pounds, and gallons.
The metric system is based around powers of ten, which makes it easier to scale up and down. For example, 10 millimetres make 1 centimetre, 100 centimetres make 1 metre, and 1000 metres make 1 kilometre.
The imperial system uses different relationships between units. There are 12 inches in a foot, 3 feet in a yard, and 5280 feet in a mile. This can make manual calculations more difficult, especially when converting between systems.
For online shopping, travel, product listings, building projects, fitness, and cooking, it is common to move between metric and imperial measurements. A converter helps reduce mistakes and makes measurements easier to understand.
The best approach is to check the original unit carefully, convert it once, and round only when the final answer does not require high precision.
← Back to Knowledge Centre · Weight
Kilograms vs Pounds Explained
Kilograms and pounds are both used to measure weight or mass, but they belong to different measurement systems. Kilograms are part of the metric system, while pounds are commonly used in the United States and some overseas product listings.
One kilogram equals approximately 2.20462 pounds. To convert kilograms to pounds, multiply the kilogram value by 2.20462. To convert pounds to kilograms, divide the pound value by 2.20462.
This conversion is useful for body weight, gym equipment, luggage limits, freight, postal weights, pet products, and imported goods. Australians often see kilograms locally but pounds on overseas websites.
For example, 5 kg is about 11.02 lb, 10 kg is about 22.05 lb, and 20 kg is about 44.09 lb.
When accuracy matters for shipping, freight, or health information, use the full conversion result instead of rounding too early.
← Back to Knowledge Centre · Temperature
Celsius vs Fahrenheit: What's the Difference?
Celsius and Fahrenheit are two different temperature scales. Australia uses Celsius for weather, cooking, appliances, and most everyday temperature readings. Fahrenheit is still commonly used in the United States.
To convert Celsius to Fahrenheit, multiply the Celsius value by 9, divide by 5, then add 32. To convert Fahrenheit to Celsius, subtract 32, multiply by 5, then divide by 9.
For example, 0°C equals 32°F, 20°C equals 68°F, and 100°C equals 212°F. These points are helpful because they represent freezing point, comfortable room temperature, and boiling point of water at standard pressure.
This conversion is useful when reading overseas recipes, product manuals, weather forecasts, oven settings, and appliance instructions.
Temperature conversion is one of the most common reasons people use online converters, especially when comparing Australian and American information.
← Back to Knowledge Centre · Pressure
PSI vs kPa Explained
PSI and kPa are both pressure units. PSI means pounds per square inch and is common in tyre pressure gauges, compressors, and older equipment. kPa means kilopascal and is part of the metric system used widely in Australia.
One PSI equals approximately 6.89476 kPa. To convert PSI to kPa, multiply the PSI value by 6.89476. To convert kPa to PSI, divide the kPa value by 6.89476.
This conversion is especially useful for car tyres, motorcycle tyres, bicycle tyres, air compressors, spray equipment, and workshop tools.
For example, 30 PSI is approximately 207 kPa, 35 PSI is approximately 241 kPa, and 40 PSI is approximately 276 kPa.
Always follow the pressure recommendation listed by the vehicle, tool, tyre, or equipment manufacturer.
← Back to Knowledge Centre · Power
Horsepower vs Kilowatts
Horsepower and kilowatts are both used to describe power. Horsepower is often used for engines, pumps, compressors, and older machinery. Kilowatts are part of the metric system and are commonly used in Australia for engines, motors, appliances, and electrical equipment.
One mechanical horsepower equals approximately 0.7457 kilowatts. To convert horsepower to kilowatts, multiply horsepower by 0.7457. To convert kilowatts to horsepower, divide kilowatts by 0.7457.
This conversion is useful when comparing cars, generators, air compressors, electric motors, pumps, ride-on mowers, and workshop equipment.
For example, 10 hp is about 7.46 kW, 50 hp is about 37.29 kW, and 100 hp is about 74.57 kW.
Some countries and industries may use slightly different horsepower definitions, so check the context when precision matters.
← Back to Knowledge Centre · Energy
Kilojoules vs Calories on Food Labels
Kilojoules and calories are both units of energy. In Australia, food labels usually show energy in kilojoules, while many fitness apps, diet plans, and overseas resources use calories.
One calorie commonly used in nutrition is actually one kilocalorie. One nutritional calorie equals approximately 4.184 kilojoules. To convert calories to kilojoules, multiply by 4.184. To convert kilojoules to calories, divide by 4.184.
This is useful when comparing Australian food labels with American recipes, diet plans, gym apps, and nutrition guides.
For example, 100 calories equals about 418 kJ, 500 calories equals about 2092 kJ, and 2000 calories equals about 8368 kJ.
Energy needs vary from person to person, so conversions are helpful for comparison but should not replace personalised health advice.
← Back to Knowledge Centre · Volume
Litres vs Gallons Explained
Litres and gallons are both used to measure volume, but they are not the same. Australia uses litres for fuel, drinks, water tanks, chemicals, and most everyday volume measurements. Gallons are often seen in American product listings and older equipment manuals.
There are different gallon types. The US gallon is about 3.78541 litres, while the imperial gallon is about 4.54609 litres. This difference is important when converting fuel, tank capacity, or liquid measurements.
To convert US gallons to litres, multiply by 3.78541. To convert litres to US gallons, divide by 3.78541.
For example, 1 US gallon is about 3.79 litres, 5 US gallons is about 18.93 litres, and 10 US gallons is about 37.85 litres.
Always check whether the source means US gallons or imperial gallons before relying on the result.
← Back to Knowledge Centre · Area
Acres vs Hectares
Acres and hectares are both used to measure land area. Hectares are part of the metric system and are common in Australia for farms, rural land, and larger properties. Acres are still widely used in real estate, farming, and older land descriptions.
One hectare equals approximately 2.47105 acres. One acre equals approximately 0.404686 hectares.
To convert hectares to acres, multiply by 2.47105. To convert acres to hectares, multiply by 0.404686.
For example, 1 hectare is about 2.47 acres, 10 hectares is about 24.71 acres, and 100 acres is about 40.47 hectares.
This conversion is useful when comparing property listings, farms, paddocks, development blocks, and land size descriptions.
← Back to Knowledge Centre · Length
Millimetres to Inches for Tools and Parts
Millimetres and inches are commonly used for tools, bolts, brackets, fittings, machinery parts, and product dimensions. Australia generally uses metric measurements, while many imported products and manuals still include inches.
One inch equals exactly 25.4 millimetres. To convert millimetres to inches, divide by 25.4. To convert inches to millimetres, multiply by 25.4.
This is useful when checking drill bits, socket sizes, pipe fittings, screws, bolts, brackets, screens, and replacement parts.
For example, 6 mm is about 0.236 inches, 10 mm is about 0.394 inches, 25.4 mm equals exactly 1 inch, and 50.8 mm equals exactly 2 inches.
For workshop or engineering use, rounding too much can cause fitment issues, so keep enough decimal places when accuracy matters.
← Back to Knowledge Centre · Currency
How Exchange Rates Work
Exchange rates show how much one currency is worth compared with another. For example, an Australian dollar to US dollar rate shows how much USD can be received for one AUD before fees, spreads, or provider charges.
Rates change constantly because of supply and demand, interest rates, inflation, economic news, investor confidence, trade, and global events.
Online currency converters are useful for estimates, but the final amount from a bank, card provider, marketplace, or payment platform may be different because of fees and exchange rate margins.
This is important for travel, online shopping, eBay selling, dropshipping, importing, exporting, and comparing supplier prices.
When money is involved, treat converter results as a guide and check the final rate with the provider handling the transaction.
← Back to Knowledge Centre · World Time
Understanding World Time Zones
Time zones allow different parts of the world to use local times that roughly match daylight hours. Without time zones, every town could have a different local time based on the position of the sun.
Most time zones are measured as offsets from UTC, which stands for Coordinated Universal Time. For example, Sydney is usually ahead of UTC, while New York is behind UTC.
Time zones matter for travel, online meetings, phone calls, international business, live events, shipping, and customer support.
Daylight saving time can make time zones more confusing because some places move their clocks forward for part of the year while others do not.
A world time tool helps compare cities quickly, especially when organising calls between Australia, New Zealand, the United States, Europe, and Asia.
← Back to Knowledge Centre · World Time
What Is UTC?
UTC stands for Coordinated Universal Time. It is the main time standard used around the world for timekeeping, aviation, technology, science, and international coordination.
Time zones are often described as offsets from UTC. For example, a location might be UTC+10, UTC+11, UTC-5, or UTC+1 depending on its standard time and daylight saving rules.
UTC does not change for daylight saving time. Local time zones may change, but UTC remains stable.
This makes UTC useful for servers, websites, calendars, shipping systems, flight schedules, and international communication.
When comparing world times, it helps to understand that local times are usually calculated from UTC plus or minus the relevant offset.
← Back to Knowledge Centre · World Time
Daylight Saving Time Explained
Daylight saving time is the practice of moving clocks forward by one hour during part of the year. The goal is to shift more daylight into the evening.
Not every country uses daylight saving time, and even within Australia, not every state or territory follows it. This can make time comparisons confusing.
During daylight saving time, a city may have a different UTC offset than it has during standard time. For example, a city that is usually UTC+10 may become UTC+11 during daylight saving.
This affects meeting times, travel plans, live events, customer support, and international calls.
When accuracy matters, use a world time tool instead of relying on memory, especially during the months when daylight saving starts or ends.
← Back to Knowledge Centre · Trade
Common Conversions Used in Construction
Construction, fabrication, home improvement, and workshop projects often involve quick conversions between millimetres, centimetres, metres, inches, feet, square metres, and sometimes cubic measurements.
In Australia, plans and materials are usually measured in metric units. However, imported tools, accessories, screens, fittings, timber sizes, and online listings may use imperial measurements.
Common examples include converting inches to millimetres for bolt sizes, feet to metres for room dimensions, square metres to square feet for flooring, and litres to gallons for liquids or coatings.
Mistakes in measurement can lead to poor fitment, wasted material, or incorrect orders.
A quick converter can help confirm the measurement before cutting, ordering, installing, or comparing products.
← Back to Knowledge Centre · Cooking
Cooking Measurement Conversions
Cooking conversions are useful when following recipes from different countries. Australian recipes often use metric measurements such as grams, millilitres, litres, and Celsius. American recipes often use cups, ounces, pounds, and Fahrenheit.
Volume and weight are not always interchangeable because different ingredients have different densities. One cup of flour does not weigh the same as one cup of sugar or one cup of water.
Temperature conversion is also common when using overseas recipes. For example, 180°C is about 356°F, often rounded to 350°F in many recipes.
Liquid conversions such as millilitres to fluid ounces can help when using imported measuring cups, bottles, or recipe guides.
For best results, use weight-based measurements where possible, especially when baking.
← Back to Knowledge Centre · Speed
Kilometres per Hour vs Miles per Hour
Kilometres per hour and miles per hour are both used to measure speed. Australia uses kilometres per hour for road speeds, while the United States and some other places use miles per hour.
One mile per hour equals approximately 1.60934 kilometres per hour. To convert mph to km/h, multiply by 1.60934. To convert km/h to mph, divide by 1.60934.
This conversion is useful when comparing cars, bikes, GPS devices, imported manuals, travel guides, motorsport information, and fitness tracking data.
For example, 60 mph is about 96.56 km/h, 70 mph is about 112.65 km/h, and 100 km/h is about 62.14 mph.
When driving, always follow the speed units and limits shown in the country you are in.
← Back to Knowledge Centre · Force
Newtons and Pounds Force Explained
Newtons and pounds force are both used to measure force. Newtons are part of the metric system and are commonly used in science, engineering, tools, springs, torque discussions, and technical specifications.
A pound force describes the force of gravity on a one-pound mass under standard gravity. One pound force equals approximately 4.44822 newtons.
To convert pounds force to newtons, multiply by 4.44822. To convert newtons to pounds force, divide by 4.44822.
This conversion can appear in tool specifications, gas struts, springs, lifting equipment, clamps, and engineering references.
When force relates to safety, lifting, or load ratings, always confirm the specification with the manufacturer or a qualified professional.
← Back to Knowledge Centre · Area
Square Metres vs Square Feet
Square metres and square feet are both used to describe area. Australia commonly uses square metres for rooms, homes, land improvements, flooring, wall coverage, and building plans. Square feet are common in American real estate and product information.
One square metre equals approximately 10.7639 square feet. To convert square metres to square feet, multiply by 10.7639. To convert square feet to square metres, divide by 10.7639.
This conversion is useful when comparing house sizes, room sizes, flooring, rugs, sheds, offices, and workshop spaces.
For example, 10 square metres is about 107.64 square feet, 50 square metres is about 538.2 square feet, and 100 square metres is about 1076.39 square feet.
Area conversions square the length relationship, so they are not the same as simple metre-to-foot conversions.
← Back to Knowledge Centre · Vehicle
Fuel Economy: L/100km and MPG
Fuel economy can be shown in litres per 100 kilometres or miles per gallon. Australia commonly uses litres per 100 kilometres, while the United States often uses miles per gallon.
Lower L/100km means better fuel economy, while higher MPG means better fuel economy. This can be confusing because the numbers move in opposite directions.
Converting between L/100km and MPG is useful when comparing imported vehicles, overseas reviews, older manuals, and international car specifications.
The US gallon and imperial gallon are different sizes, so US MPG and UK MPG are not the same.
When comparing vehicles, make sure the source is using the same gallon type and the same driving test standard.
← Back to Knowledge Centre · General
Why Online Converters Are Useful
Online converters help turn unfamiliar units into measurements that are easier to understand. They are useful for shopping, travel, work, study, cooking, fitness, trade work, real estate, and product comparisons.
A good converter reduces mistakes by doing the calculation instantly and consistently. This is especially helpful when the conversion factor is hard to remember or when the result requires decimals.
Converters are also helpful when reading overseas websites. Product dimensions, weight limits, recipes, screen sizes, tyre pressures, fuel economy, and power ratings may use different units depending on the country.
The best use of a converter is to check the unit type first, enter the value carefully, and review the result before making decisions.
Aaron's Converter is designed to keep the tools simple while also providing plain-English guides for people who want to understand the conversion.
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Conversions, currency estimates, and time information are provided for general guidance only. Currency rates may differ from banks, payment platforms, and financial institutions.