# Unit converters

- Human page: https://happytails.ai/en/unit-converters/
- Markdown: https://happytails.ai/en/unit-converters.md
- Structured JSON: https://happytails.ai/agents/en/unit-converters/index.json
- Visibility: public

## Page guide

Find the tool you need, then open it to get started.

## All unit converters

- [Angle](https://happytails.ai/en/unit-converters/angle/): Convert between degrees, radians, and turns. ([Markdown](https://happytails.ai/en/unit-converters/angle.md))

- [Area](https://happytails.ai/en/unit-converters/area/): Convert between square meters, square feet, acres, and other area units. ([Markdown](https://happytails.ai/en/unit-converters/area.md))

- [Celsius to fahrenheit](https://happytails.ai/en/unit-converters/celsius-to-fahrenheit/): Direction-specific preset and reverse mode. ([Markdown](https://happytails.ai/en/unit-converters/celsius-to-fahrenheit.md))

- [Cm to inches](https://happytails.ai/en/unit-converters/cm-to-inches/): Preset cm/inches with decimal/fraction choices. ([Markdown](https://happytails.ai/en/unit-converters/cm-to-inches.md))

- [Data storage](https://happytails.ai/en/unit-converters/data-storage/): Convert between bits, bytes, decimal storage units, and binary storage units. ([Markdown](https://happytails.ai/en/unit-converters/data-storage.md))

- [Energy](https://happytails.ai/en/unit-converters/energy/): Convert between joules, calories, watt-hours, and kilowatt-hours. ([Markdown](https://happytails.ai/en/unit-converters/energy.md))

- [Fahrenheit to celsius](https://happytails.ai/en/unit-converters/fahrenheit-to-celsius/): Direction-specific examples and reverse mode. ([Markdown](https://happytails.ai/en/unit-converters/fahrenheit-to-celsius.md))

- [Grams to ounces](https://happytails.ai/en/unit-converters/grams-to-ounces/): Distinguish avoirdupois from troy ounces. ([Markdown](https://happytails.ai/en/unit-converters/grams-to-ounces.md))

- [Inches to cm](https://happytails.ai/en/unit-converters/inches-to-cm/): Decimal/fraction input and explicit output rounding. ([Markdown](https://happytails.ai/en/unit-converters/inches-to-cm.md))

- [Kg to lb](https://happytails.ai/en/unit-converters/kg-to-lb/): Preset kg/lb direction, reciprocal input and precision. ([Markdown](https://happytails.ai/en/unit-converters/kg-to-lb.md))

- [Km to miles](https://happytails.ai/en/unit-converters/km-to-miles/): Use international mile. ([Markdown](https://happytails.ai/en/unit-converters/km-to-miles.md))

- [Lbs to kg](https://happytails.ai/en/unit-converters/lbs-to-kg/): Direction-specific input and examples with verified constant. ([Markdown](https://happytails.ai/en/unit-converters/lbs-to-kg.md))

- [Length](https://happytails.ai/en/unit-converters/length/): Convert between meters, feet, inches, and other length units. ([Markdown](https://happytails.ai/en/unit-converters/length.md))

- [Liters to gallons](https://happytails.ai/en/unit-converters/liters-to-gallons/): US liquid versus Imperial gallon selector visible by default. ([Markdown](https://happytails.ai/en/unit-converters/liters-to-gallons.md))

- [Meters to feet](https://happytails.ai/en/unit-converters/meters-to-feet/): Decimal feet versus feet-and-inches outputs explicitly separated. ([Markdown](https://happytails.ai/en/unit-converters/meters-to-feet.md))

- [Mm to inches](https://happytails.ai/en/unit-converters/mm-to-inches/): Decimal/fractional inches and precision controls. ([Markdown](https://happytails.ai/en/unit-converters/mm-to-inches.md))

- [Mph to kmh](https://happytails.ai/en/unit-converters/mph-to-kmh/): Preset speed direction and consistent decimal precision. ([Markdown](https://happytails.ai/en/unit-converters/mph-to-kmh.md))

- [Power](https://happytails.ai/en/unit-converters/power/): Convert between watts, kilowatts, megawatts, and horsepower. ([Markdown](https://happytails.ai/en/unit-converters/power.md))

- [Pressure](https://happytails.ai/en/unit-converters/pressure/): Convert between pascals, kilopascals, bar, atmospheres, and psi. ([Markdown](https://happytails.ai/en/unit-converters/pressure.md))

- [Speed](https://happytails.ai/en/unit-converters/speed/): Convert between meters per second, kilometers per hour, miles per hour, and knots. ([Markdown](https://happytails.ai/en/unit-converters/speed.md))

- [Temperature](https://happytails.ai/en/unit-converters/temperature/): Convert between Celsius, Fahrenheit, and Kelvin. ([Markdown](https://happytails.ai/en/unit-converters/temperature.md))

- [Time units](https://happytails.ai/en/unit-converters/time-units/): Convert between milliseconds, seconds, minutes, hours, days, and weeks. ([Markdown](https://happytails.ai/en/unit-converters/time-units.md))

- [Volume](https://happytails.ai/en/unit-converters/volume/): Convert between liters, milliliters, and US or Imperial volume units. ([Markdown](https://happytails.ai/en/unit-converters/volume.md))

- [Weight](https://happytails.ai/en/unit-converters/weight/): Convert between kilograms, pounds, ounces, and other mass units. ([Markdown](https://happytails.ai/en/unit-converters/weight.md))

## Convert the quantity, not just the number

A unit conversion expresses the same quantity using another scale. Prefixes, regional conventions and similarly named units can change the conversion factor, so selecting the exact source and destination units matters.

## How to choose your next step

Check whether the measurement is length, area, volume, mass or another quantity. A conversion factor for length cannot be applied unchanged to area or volume.

## Common questions about unit converters

### Why are some conversions not simple multiplication?

Some scales include an offset as well as a factor. Temperature scales are a familiar example, so use the appropriate formula for the selected units.

### Can more decimal places make a measurement more accurate?

No. Extra displayed digits do not add precision to the original measurement. Keep rounding consistent with the accuracy of the input.