Free Online Unit Converter – Length, Weight, Temperature & More

A unit converter recalculates a measurement into a different unit while preserving the represented physical quantity. One kilometre and approximately 0.621371 miles describe the same distance. The source and destination may use metric (SI), imperial or US customary conventions, and the correct factor depends on precisely which unit is selected. An online conversion calculator saves manual arithmetic and makes routine comparisons easier to check.

MyToolSpace Unit Converter organizes more than 70 units into 12 categories: length, weight or mass, area, volume, temperature, speed, time, data storage, energy, pressure, power and angle. Users can search a unit name or symbol, change a value and immediately read its equivalent. Formula explanations, worked steps, all-unit breakdowns and reference tables make the tool useful for learning as well as quick answers.

Use this page when comparing international specifications, checking a recipe volume, translating travel distances or understanding a science problem. It is a general unit-conversion tool, rather than a live exchange-rate service or an industry-certified measurement instrument. For contracts, safety-critical engineering, dosage calculations and regulated measurements, verify source data, significant figures and applicable standards separately.

The metric system uses prefixes such as milli-, centi- and kilo- to express factors of ten. One kilometre contains 1,000 metres; one centimetre contains 10 millimetres. International System of Units (SI) conventions are widely used in science and trade. Imperial and US customary names overlap, but their volume definitions can differ, so the label attached to a gallon or fluid ounce matters.

An international inch is exactly 0.0254 metre and a pound is exactly 0.45359237 kilogram. An international mile is exactly 1,609.344 metres. Those fixed relationships help calculate conversions such as feet to meters, miles to kilometers, kilograms to pounds or pounds to kilograms. Results shown at limited decimal places are rounded representations of the underlying arithmetic.

For liquid measurements, 1 US liquid gallon equals exactly 3.785411784 litres, while the imperial gallon equals 4.54609 litres. A US cup is commonly 236.5882365 millilitres, but recipes may use a metric cup of 250 mL. Confirm whether a unit refers to US, UK or metric practice instead of assuming similarly named measurements match.

Length conversion is one of the most common unit calculator tasks. A route distance may appear in kilometres while a vehicle odometer uses miles; a furniture specification may be given in inches while room dimensions are in centimetres. The converter supports quick pairs such as km to miles, miles to km, cm to inches, inches to cm, meters to feet and feet to meters.

For example, 5 kilometres equal 5,000 metres and approximately 3.106855961 miles. One mile is exactly 5,280 feet, so converting road distance from miles to feet is a multiplication by 5,280. For centimetres to inches, divide by 2.54; for inches to centimetres, multiply by 2.54. A conversion table helps compare repeated distances without re-entering each input.

Precision should reflect your real measurement. Converting a roughly measured room width of 3 metres to many decimal places does not make the underlying measurement accurate to micrometres. Architects, builders and fabricators should keep tolerances and measurement uncertainty alongside unit values.

Everyday language often calls a body or parcel measurement weight, though kilograms and pounds are units of mass. Convert kilograms to pounds by multiplying by about 2.2046226218; convert pounds to kilograms with the exact factor 0.45359237. For example, 10 kg is approximately 22.0462 lb. Smaller ingredients, jewelry specifications or laboratory quantities often use grams and ounces instead.

An avoirdupois ounce is 1/16 pound, approximately 28.349523125 grams. Not all ounces describe the same quantity: a fluid ounce measures volume, not mass, and a troy ounce used for precious metals differs from the everyday avoirdupois ounce. Select the correct category before trying to relate a liquid volume directly to grams.

The unit converter changes units within a compatible measurement category; it does not automatically know a substance’s density. A kilogram of flour and a kilogram of water have the same mass but occupy different volumes. Use ingredient-specific information when translating a recipe between cups and grams rather than treating mass and volume as interchangeable.

Area uses squared length units and volume uses cubed length units, so their scale factors differ from single-length conversion. One square metre equals approximately 10.763910417 square feet, not 3.28084 square feet. Land measurements may be expressed as hectares, acres, square metres or square kilometres. When planning flooring, painting or land comparisons, enter an area value in the Area category rather than the Length category.

Volume conversions cover useful liquid and cubic measurements. One litre is exactly one cubic decimetre or 1,000 cubic centimetres, while 1 cubic metre equals 1,000 litres. One US gallon is 3.785411784 litres; millilitres are convenient for small quantities. US cups and gallons can be helpful in imported recipes and product documentation, provided the cup definition matches the source.

A converter can express capacity correctly, but practical purchasing decisions still require allowances for waste, packaging sizes and material behavior. A floor-plan area does not directly reveal paint requirements without a coverage rate, and a litre of dry granular material does not necessarily equal a kilogram. Use the resulting equivalent together with the context-specific calculation.

Temperature is different from ordinary scale-only units because Celsius, Fahrenheit and Kelvin have different zero points. To convert Celsius to Fahrenheit, use °F = (°C × 9/5) + 32. To convert Fahrenheit to Celsius, use °C = (°F − 32) × 5/9. Thus 20°C equals 68°F, 0°C equals 32°F, and 100°C equals 212°F.

Kelvin is the SI unit of thermodynamic temperature. The relation is K = °C + 273.15. Thus 25°C corresponds to 298.15 K. Do not add a degree symbol before K, and do not use a simple proportional multiplier for Fahrenheit and Celsius values. Temperatures below absolute zero, 0 K, are outside the normal thermodynamic temperature scale.

Use the temperature category for weather reports, oven settings, laboratory reference values or technical documentation. Weather forecasts describe ambient temperature, while oven settings can vary with appliance calibration. The converter provides numerical equivalences, not an assessment of appliance performance, medical guidance or a promise that every oven runs at its dial setting.

Speed connects distance with time, so converting between kilometres per hour and miles per hour uses the same kilometre-to-mile length relationship when the time denominator is unchanged. Multiply mph by 1.609344 to obtain km/h. For example, 60 mph is 96.56064 km/h. Multiply km/h by approximately 0.6213711922 to obtain mph.

Convert hours, minutes and seconds for activity tracking, scheduling and technical calculations. One hour contains 60 minutes and 3,600 seconds; one day contains 24 hours in the standard duration sense. Calendar days, daylight saving changes and civil time zones involve more than fixed elapsed-time arithmetic, so use a date-time tool for calendar-specific tasks.

If a road sign uses mph but your dashboard uses km/h, compare the equivalent limits carefully. This page does not infer legal limits or account for road conditions. If estimating travel time, calculate distance divided by average speed separately and allow for stops, traffic and other real-world constraints.

Digital data measurement includes two commonly confused prefix systems. Decimal prefixes use powers of 1,000: 1 KB = 1,000 bytes, 1 MB = 1,000,000 bytes and 1 GB = 1,000,000,000 bytes. Binary prefixes use powers of 1,024: 1 KiB = 1,024 bytes, 1 MiB = 1,048,576 bytes and 1 GiB = 1,073,741,824 bytes. A bit and a byte are different units; one byte comprises eight bits.

This distinction matters when comparing advertised SSD capacity, file sizes, operating-system storage readouts and transfer quantities. One decimal GB is about 0.931322575 GiB. It is incorrect to say 1 GB equals 1,073,741,824 bytes: that byte count defines a GiB. Some legacy interfaces label binary values ambiguously, so examine the stated convention.

The Unit Converter offers a Data Storage category for common byte and bit equivalents, including decimal and binary units. For more focused storage calculations, MyToolSpace also provides a dedicated Data Storage Converter. Neither unit conversion alone nor displayed file size can determine real download time without a transfer rate, network overhead and conditions.

Energy describes an amount of work or transferred heat, while power measures the rate of energy transfer. A joule is the SI unit of energy; a watt is one joule per second. A kilowatt-hour measures energy, not power: 1 kWh equals exactly 3,600,000 joules. This distinction is important when reading electricity bills or estimating a device’s usage.

Food energy often uses kilocalories, sometimes printed as Calories with a capital C, alongside kilojoules. One thermochemical kilocalorie is 4.184 kilojoules. Some calorie definitions vary by convention, so note the particular unit when strict scientific precision matters. Converting kWh to joules or watts to kilowatts does not calculate electricity cost by itself; tariff and usage duration are needed.

Power conversion can help compare watts, kilowatts and horsepower where relevant. Horsepower has more than one historical definition, so technical equipment specifications should state whether mechanical, metric or another horsepower variant is intended. Use the category selector and label details rather than assuming all units with similar names are identical.

Pressure expresses force per unit area and appears in weather, laboratory equipment and mechanical specifications. One pascal equals one newton per square metre. Useful conversions include kilopascals, bar, atmospheres and pounds per square inch (psi). For reference, one standard atmosphere is exactly 101,325 Pa, and one bar is exactly 100,000 Pa. Gauge pressure and absolute pressure refer to different zero points; a unit converter does not automatically change the reference basis.

Angle measurement commonly uses degrees and radians. A full revolution equals 360 degrees or 2π radians, so radians = degrees × π/180 and degrees = radians × 180/π. Thus 90° = π/2 radians and 180° = π radians. Conversions may also involve turns and other angular conventions where provided by the category.

Engineers, students, GIS learners and makers can use these categories for reference or formula checking. Do not treat an angle number as a slope percentage without a trigonometric calculation, or confuse a tyre-pressure recommendation with the pressure of a different type of system. For specialized angle or fuel-consumption workflows, use the appropriate dedicated converter.

The live MyToolSpace page describes internationally standardized conversion factors and double-precision numerical arithmetic, roughly 15 significant decimal digits. That describes the underlying calculation precision; it does not mean every entered physical measurement is known to 15 significant digits. A measuring tape marked in centimetres, for example, cannot support nanometre-level confidence simply because the numeric display includes many digits.

Use automatic formatting for everyday tasks or choose 0 through 10 displayed decimal places according to the precision needed. Rounding a result to two decimals does not change the original standardized unit relationship. Scientific notation is useful for tiny and very large numbers, for example 1e6 for one million or 1.5e-9 for 0.0000000015. It also avoids reading long runs of zeros incorrectly.

Floating-point representations have limits and may not store all decimal fractions exactly. Extremely large integers, comparisons near a threshold and cumulative precision-sensitive engineering calculations may require domain-specific software or decimal arithmetic. Treat printed tables as convenient references, verify intermediate rounding, and report an answer with an appropriate number of significant figures.