What categories does this cover?

This converter covers Angle, Data Transfer Speed, Energy, Force, Frequency, Fuel Economy, Pressure, and Power — specialized categories beyond the standard length/weight/temperature converters.

How does fuel economy conversion work?

Fuel economy conversions handle the inversion between mpg-style (higher = better) and L/100km-style (lower = better) units correctly using the reciprocal relationship.

How precise are the conversions?

Results are shown to up to 10 significant figures to avoid floating-point noise while maintaining high precision for scientific and engineering use.

What is the difference between BTU and BTU/hr?

BTU (British Thermal Unit) is a unit of energy found in the Energy category, while BTU/hr is a unit of power (energy per unit time) found in the Power category.

Advanced Unit Converter

About this tool

A comprehensive unit converter covering 8 specialized categories not found in typical converters: Angle, Data Transfer Speed, Energy, Force, Frequency, Fuel Economy, Pressure, and Power. Navigate each category via tabs, enter a value in any unit field, and all other units update instantly.

How to use

1 Step 1: Select a category tab (Angle, Energy, Pressure, etc.) for the type of unit you want to convert.
2 Step 2: Type a value into any unit's input field — all other units in the category will update instantly.
3 Step 3: Click the copy icon next to any result to copy that value to your clipboard.
4 Step 4: Switch to a different category tab to perform conversions in another unit domain without losing your current values.

The units a basic converter leaves out

A standard unit converter handles the everyday quantities — length, weight, temperature, volume. This advanced converter covers the categories that engineers, scientists, and technical users actually need but rarely find in one place: angle, data-transfer speed, energy, force, frequency, fuel economy, pressure, and power. Each is its own tab, and within a tab every field is live: type a value into any unit and all the others update at once, so you never have to pick a "from" and a "to." That all-fields-linked behaviour is what makes it fast for exploratory work.

How the conversion works

Most categories use a single base unit and store every other unit as a fixed multiple of it. Energy uses the joule; force uses the newton; pressure uses the pascal; power uses the watt. Converting is two steps: multiply your input by the source unit's factor to reach the base, then divide by the target's factor. Because the factors are exact physical constants, the result is a clean multiply-and-divide with no accumulated rounding. The tool displays answers to ten significant figures and switches to scientific notation for very large or very small magnitudes — essential when you are converting electron-volts (about 1.602 × 10⁻¹⁹ J) alongside kilowatt-hours.

A worked example: pressure

Suppose you read a tyre pressure of 32 PSI and need it in bar and kilopascals. The pressure base is the pascal. One PSI is 6894.76 Pa, so the tool first computes 32 × 6894.76 = 220,632.3 Pa. Dividing by the bar factor (100000) gives 2.206 bar, and dividing by the kPa factor (1000) gives 220.6 kPa. Type 32 into the PSI field and every other pressure unit — atmospheres, mmHg, torr, megapascals — fills in simultaneously from that same intermediate pascal value.

The two categories that need special handling

Not every quantity is a simple multiplier, and the tool handles the exceptions correctly:

Fuel economy is inverse. Miles per gallon and litres per 100 km move in opposite directions — more MPG means fewer L/100km. The tool converts through L/100km using reciprocal relationships: US MPG to L/100km is 235.215 ÷ value. This is why doubling your MPG does not double the L/100km figure; halving it does. It also keeps US and UK gallons separate (US MPG uses 235.215, UK MPG uses 282.481), a distinction that quietly corrupts a lot of road-trip maths.
Frequency includes RPM. Revolutions per minute is just hertz divided by 60, so 3000 RPM equals 50 Hz. Having RPM in the same tab as kHz, MHz, and GHz is handy when you cross between mechanical and electronic figures.

Worked example: fuel economy

A car rated at 40 mpg (US) converts to 235.215 ÷ 40 = 5.88 L/100km. The same 40 figure interpreted as UK gallons would be 282.481 ÷ 40 = 7.06 L/100km — a 20% difference that comes purely from which gallon you meant. Picking the right tab field prevents a costly misread when comparing a US-market and a European-market car.

Use cases

Engineering and physics. Move between newtons and pound-force, pascals and atmospheres, or joules and BTU without a lookup table.
Electronics and computing. Convert clock frequencies and data-transfer rates (bps through Tbps) in the same view.
Automotive. Compare fuel economy across US, UK, and metric figures correctly.
Lab and energy work. Reconcile calories, kilocalories, kilowatt-hours, and electron-volts for the same measurement.

Tips and common mistakes

Use the copy button. Each field has a copy icon that puts the full-precision value on your clipboard — copy that, not a rounded reading, if it feeds another calculation.
Remember fuel economy is reciprocal. If a converted value moves the "wrong" way as you raise your input, that is correct behaviour for L/100km, not a bug.
Mind US versus UK gallons. The two MPG units differ by about 20%; choose the one matching the source figure deliberately.
Scientific notation is exact, not vague. When a result shows as 1.602e-19, that is full precision in compact form, common for energy and force at atomic scale.
Keep your real precision in mind. Ten displayed digits do not make a two-digit measurement more accurate — the extra figures are only meaningful if your input was.

Privacy

Every conversion uses fixed constants computed in your browser. Nothing you type is sent anywhere, and the converter returns the same exact answer every time, fully offline once loaded.