UNIT CONVERTER
Convert measurements across 10 categories instantly.
Everything runs locally in your browser. Your data never leaves your device - no uploads, no servers, no data transmission.
All processing happens directly on your machine using JavaScript. Close the tab and all data is released.
Conversion category
Converter
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Choose category
Select measurement type
Enter value
Type value and select units
Get result
Instant conversion appears
Why choose this unit converter?
10 categories, 81 units, 8-decimal precision, 4 number separator formats
Thousand separator
4 custom formats: auto (language-based), comma (1,000,000), space (1 000 000), or dot (1.000.000). Perfect for international use.
Smart unit search
Search across all 81 units in 10 categories. Type partial names and find the exact unit you need instantly.
10 Categories
Convert length, weight, temperature, volume, speed, area, time, data, energy, and pressure.
Metric & Imperial
Support for both metric and imperial units, plus scientific measurements.
High Precision
Accurate results up to 8 decimal places using standard conversion formulas.
Swap & copy
Swap input and output units with one click. Copy converted result to clipboard - formatting is auto-stripped for clean paste.
Frequently Asked Questions
Everything about unit conversion
What is a unit converter?
A unit converter transforms measurements from one unit to another within the same category (e.g., kilometers to miles, pounds to kilograms).
How accurate is this unit converter?
This converter provides precision up to 8 decimal places using SI-based reference values and standard conversion formulas.
Which units are supported?
This tool supports metric, imperial, and scientific units across 10 categories: Length, Weight, Temperature, Volume, Speed, Area, Time, Data, Energy, and Pressure - 81 units total.
How do I convert temperature?
Select the Temperature category, enter your value, choose the input unit (e.g., Celsius), and select your output unit (e.g., Fahrenheit). The conversion is instant. Temperature uses dedicated non-linear formulas (not simple multipliers) for Celsius, Fahrenheit, and Kelvin.
Is my data safe with this tool?
Everything runs locally in your browser using client-side JavaScript. No values are transmitted to any server. Close the tab and all data is released.
Technical Details
How this unit converter online tool processes 500+ unit pairs
Conversion Engine
This unit converter online tool processes conversions across 10 categories (length, weight, temperature, volume, speed, area, time, data, energy, pressure) with 81 units and 500+ possible conversion pairs. Each conversion uses SI-based reference values with up to 8 decimal places of precision - matching international measurement standards.
Temperature Formulas
Temperature conversions use dedicated formulas rather than simple multipliers. Celsius to Fahrenheit: (C x 9/5) + 32. Celsius to Kelvin: C + 273.15. This convert units tool handles all six bidirectional temperature conversions (Celsius, Fahrenheit, Kelvin) with mathematically exact results - no rounding errors from chained multiplication.
Smart Unit Search
The dropdown search indexes all 81 units across all 10 categories simultaneously. Type partial names and the engine filters with sub-10ms response time, prioritizing the currently selected category. Keyboard navigation with arrow keys and Enter for zero-mouse operation. This unit converter supports metric, imperial, and scientific units.
Zero-Upload Architecture
Every calculation runs entirely in your browser using JavaScript. No values are transmitted to any server - zero data collection, zero analytics on your inputs. Four number separator formats (auto, comma, space, dot) adapt to international conventions. Close the tab and everything is gone.