Ratio and Proportion Converters
Choose the units you want to convert. Each tool includes a calculator, formula and examples.
12 converters
Ratio to Percentage
→ % (a:b treated as a/b, not a/(a+b))
Percentage to Ratio
→ ratio to 1
Ratio to Fraction
→ decimal fraction (retain input pair for exact ratio)
Fraction to Ratio
→ decimal fraction (retain input pair for exact ratio)
Odds to Probability
→ probability
Probability to Odds
→ odds to 1
Aspect Ratio Converter
→ width:height ratio as decimal
Map Ratio Converter
→ m on map
Mixing Ratio Converter
→ first component quantity (remainder is second component)
Dilution Ratio Converter
→ first component quantity (remainder is second component)
Scale Ratio Converter
→ m actual
Gear Ratio Converter
→ ratio
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About these conversions
Browse 12 published tools in Ratio and Proportion Converters. Select the source and destination unit that match your measurement. Each generated calculator shows a formula, worked examples, a conversion table and detailed answers so you can check the relationship before using the result.
Choosing a unit convention
Read the unit definition beside the calculator. The same everyday name can describe a different regional or industry standard. Keep the original unit and its convention with the converted value. A unit change does not determine a missing density, duration, market rate or material property.
Checking and reporting your answer
Use a one-unit reference value to confirm the conversion direction, then compare a worked example with your own arithmetic. Keep intermediate digits and round the final answer according to the accuracy of the original measurement. Include the destination unit in a report or spreadsheet header. For work governed by a contract, protocol or technical standard, follow that document’s definition and validation requirements.
Frequently asked questions
Which tools are available in Ratio and Proportion Converters?+
This category contains 12 published calculators. Select the unit pair that matches your input and required output. Each generated guide includes the formula, examples, a reference table, conventions and detailed answers.
How do I choose the correct conversion?+
Identify the source quantity and unit, then choose the matching destination unit. Confirm regional or industry conventions before entering a value. If the calculation needs density, time, a rate or another input, use a tool that explicitly requests that information.
Are conversion results exact?+
Some unit relationships are defined exactly; others use conventional or rounded coefficients. The accuracy of a measured result still depends on the original measurement. Keep intermediate digits and round the final result according to your task.