Converters

Unit Converter

Convert between different units of measurement online free

About

Unit converter covering 13 categories: Length, Mass, Volume, Temperature, Area, Speed, Time, Data Storage, Pressure, Energy, Frequency, Angle, and Fuel Economy. Displays the conversion formula used, supports swapping source/target units, saves favorite conversions, and includes a batch convert mode for converting a single value to all units in a category at once.

Unit conversion requires knowing exact conversion factors and handling many unit systems. This tool centralizes all common categories with formula transparency so users can verify calculations and convert across any pair of units.

Who should use this tool?

Engineers, scientists, students, travelers, cooks, and anyone who needs to convert measurements between different unit systems (metric, imperial, etc.).

Common use cases

Convert kilometers to miles for a road trip distance calculation
Convert Celsius to Fahrenheit with the formula displayed for verification
Batch-convert 100 MB to all data storage units (KB, GB, TB, etc.)
Swap gallons and liters for a recipe measurement
Save a frequently used conversion (e.g., pounds to kilograms) to the favorites panel
Compare fuel economy between mpg and L/100km for car shopping

How to Use

Select a category from the 13 options (Length, Mass, Volume, etc.) using the icon grid.

Enter a value in the source input; select the source and target units from their respective dropdowns.

View the converted result with the mathematical formula shown below (e.g., "°C × 9/5 + 32 = °F").

Click the swap button to exchange source and target units.

Click the star icon to save the current conversion pair to your favorites for quick access.

Use Batch Convert to see the input value converted to all units in the category in a single table.

Examples

Input: Category Temperature, 100°C → °F → Output: 212°F, formula: (100 × 9/5) + 32 = 212

Input: Category Data Storage, 1024 MB, Batch Convert → Output table: 0.0009766 TB, 1 GB, 1024 MB, 1073741824 bytes, etc.

Best Practices

Use Batch Convert when you need a value in multiple units (e.g., recipe scaling)
Favorite conversions you use daily (e.g., cm ↔ inches, kg ↔ lbs) for one-click access
Verify the formula shown to ensure you understand the conversion factor
Double-check the category — Speed (km/h ↔ mph) and Fuel Economy (L/100km ↔ mpg) are different
Use the swap button to quickly reverse a conversion rather than re-selecting units

Common Mistakes

Confusing Mass (kg, lb) with Force (N, lbf) — they share the "pound" name but are different categories
Using the wrong Temperature scale — Fahrenheit and Celsius use linear offsets, not just factors
Assuming 1 MB = 1000 KB (SI) vs. 1024 KB (binary) — the tool shows both where applicable
Mixing US liquid volume (cups, fluid oz) with imperial volume (UK pints) — they differ
Forgetting that Frequency (Hz) and Angular Velocity (rad/s) are related but not directly convertible without context

FAQ

Does the converter handle binary prefixes (KiB, MiB) vs. decimal prefixes (KB, MB)? Yes

Data Storage shows both binary and decimal values in batch mode.

Are conversion formulas always exact? Most are exact by definition (e.g., 1 inch = 25.4 mm). Some, like temperature, use exact formulas.

Can I add custom units or categories? Custom units are not supported yet

use favorites to save frequently used conversion pairs.

What precision is used? Results are displayed with up to 10 significant figures; very large or small numbers use scientific notation.

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Learning Resources

Dive deeper with our comprehensive guides and tutorials.

Unit Converter - Beginner's Guide

5 min read

Unit Converter Advanced Techniques

8 min read

Unit Converter

Convert between different units of measurement online free

Who should use this tool?

Engineers, scientists, students, travelers, cooks, and anyone who needs to convert measurements between different unit systems (metric, imperial, etc.).

Common use cases

Convert kilometers to miles for a road trip distance calculation
Convert Celsius to Fahrenheit with the formula displayed for verification
Batch-convert 100 MB to all data storage units (KB, GB, TB, etc.)
Swap gallons and liters for a recipe measurement
Save a frequently used conversion (e.g., pounds to kilograms) to the favorites panel
Compare fuel economy between mpg and L/100km for car shopping

How to Use

Select a category from the 13 options (Length, Mass, Volume, etc.) using the icon grid.

Enter a value in the source input; select the source and target units from their respective dropdowns.

View the converted result with the mathematical formula shown below (e.g., "°C × 9/5 + 32 = °F").

Click the swap button to exchange source and target units.

Click the star icon to save the current conversion pair to your favorites for quick access.

Use Batch Convert to see the input value converted to all units in the category in a single table.

Best Practices

Use Batch Convert when you need a value in multiple units (e.g., recipe scaling)

Favorite conversions you use daily (e.g., cm ↔ inches, kg ↔ lbs) for one-click access

Verify the formula shown to ensure you understand the conversion factor

Double-check the category — Speed (km/h ↔ mph) and Fuel Economy (L/100km ↔ mpg) are different

Use the swap button to quickly reverse a conversion rather than re-selecting units

Common Mistakes

Confusing Mass (kg, lb) with Force (N, lbf) — they share the "pound" name but are different categories

Using the wrong Temperature scale — Fahrenheit and Celsius use linear offsets, not just factors

Assuming 1 MB = 1000 KB (SI) vs. 1024 KB (binary) — the tool shows both where applicable

Mixing US liquid volume (cups, fluid oz) with imperial volume (UK pints) — they differ

Forgetting that Frequency (Hz) and Angular Velocity (rad/s) are related but not directly convertible without context

FAQ

Does the converter handle binary prefixes (KiB, MiB) vs. decimal prefixes (KB, MB)? Yes

Data Storage shows both binary and decimal values in batch mode.

Are conversion formulas always exact? Most are exact by definition (e.g., 1 inch = 25.4 mm). Some, like temperature, use exact formulas.

Can I add custom units or categories? Custom units are not supported yet

use favorites to save frequently used conversion pairs.

What precision is used? Results are displayed with up to 10 significant figures; very large or small numbers use scientific notation.

Unit Converter

About

Who should use this tool?

Common use cases

How to Use

Examples

Best Practices

Common Mistakes

FAQ

Related Tools

Same Category — Converters

JSON to CSV Converter

CSV to JSON Converter

JSON to TypeScript

Timestamp Converter

Popular Tools

JSON Formatter

Base64 Encoder/Decoder

JWT Decoder

Learning Resources

Share

Unit Converter

About

Who should use this tool?

Common use cases

How to Use

Examples

Best Practices

Common Mistakes

FAQ

Related Tools

Same Category — Converters

JSON to CSV Converter

CSV to JSON Converter

JSON to TypeScript

Timestamp Converter

Popular Tools

JSON Formatter

Base64 Encoder/Decoder

JWT Decoder

Learning Resources

Share