Conversion library

All conversion topics

Browse conversion topics by measurement domain, from everyday units and kitchen measures to digital, scientific, and engineering systems. Choose a topic to find the conversion relationship, calculator, assumptions, and reference values you need.

From topic to result

Find a conversion. Understand its basis.

Start with a subject, choose a conversion, then check the reference behind the result. Here’s one example:

Measurement domain: Everyday; Measurements for daily use
Topic: Cooking; Ingredients and kitchen measures
Conversion relationship: Cups to grams; From volume to mass
Reference basis: Ingredient & cup size; The ingredient’s density and cup volume determine the result.

Everyday

Kitchen & Drinks

Kitchen and drink conversions, from cups and grams for specific ingredients to dilution and brewing calculations.

4 topics

Core Measurements

Convert units of length, weight, volume, temperature, speed, and time across familiar measurement systems.

6 topics

Show 2 more topics

Everyday Applications

Find fuel economy, nautical, and pace conversions, alongside clothing size mappings and animal-age estimates.

5 topics

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Animal Age

Digital & Creative

Digital & Media

Data storage and screen conversions, plus image and audio file-size estimates based on format settings.

6 topics

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Imaging, Design & Production

Focal-length, light, typography, and 3D-printing conversions, with sensor, display, or material settings where needed.

4 topics

Space & Advanced Domains

Astronomical distance, wavelength, frequency, and battery-energy conversions, alongside battery-runtime estimates.

7 topics

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Science & Engineering

Physics & Electricity

Convert electrical and physical units, including voltage, current, resistance, capacitance, and inductance.

9 topics

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Chemistry & Materials

Conversions for material density, thermal conductivity, surface tension, and solution concentration, with substance-specific references where needed.

7 topics

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Historical & Ancient Measures

Historical length, mass, volume, and temperature conversions, with the period or unit definition stated.

6 topics

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Engineering & Applied

Convert engineering units for pressure, energy, power, density, flow, and other mechanical, thermal, or radiation measurements.

17 topics

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Ingredient, material & solute directories

Browse by ingredient or material

Already know what you’re measuring? Start with an ingredient, material, or solute to find its reference values and available conversions. These directories offer another way into the conversion system, alongside browsing by topic.

Cooking ingredients

Find an ingredient’s reference values and conversions between cups, spoons, grams, and other kitchen measures.

Browse cooking ingredients

Beverage ingredients

Choose a drink ingredient to find density-based conversions between grams, milliliters, fluid ounces, and cups.

Browse beverage ingredients

Materials & density

Find a material’s density reference and use it to convert between mass and volume for that substance.

Browse materials

Solutes & concentration

Choose a solute to find the molecular reference data and available conversions for solution concentration.

Browse solutes

Methods and reference basis

How different conversion types are handled

Meters to feet uses a fixed factor. Cups to grams depends on the ingredient and cup size, while a file-size estimate needs format settings. Check the reference basis and required inputs before using a result.

Know the reference basis

Fixed definitions: Unit conversions such as meters to feet use a defined factor.
Material-dependent values: Cups to grams needs an ingredient, its density, and a cup size.
Profiles and estimates: File sizes, battery runtime, and contextual mappings depend on stated inputs and limits.

Read the methodology

Check how results are verified

Verification checks factors, formulas, reference values, and assumptions, along with consistency between calculator results, tables, and reverse conversions.

Reported issues are reviewed alongside examples and stated limitations. When a shared rule changes, the conversions that use it need to be checked too.

How we verify

Use the same logic in software

For supported conversions, software can request structured results using the same calculation rules as the pages.

The API is an experimental public preview. The documentation lists supported requests, required inputs, and response formats.

API & Agents