Conversions in this category
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What is Unit Converter
Unit Converter gives you quick, reliable conversions across length, weight, temperature, data, and time. Switching between meters and feet, Celsius and Fahrenheit, or bytes and bits can slow you down. The free Unit Converter by FlexiTools.io solves that with a clean picker for category, units, and value - plus a one-click swap and a full table of related units. In the next 60 seconds, you can enter a value, convert it, copy the result, and download a CSV of all conversions in the current category.
How to Use Our Unit Converter
- Pick a category and enter a value
- Choose Length, Weight, Temperature, Data, or Time from the Category menu. Type your number in the Value field.
- Select From and To units
- Use the From and To dropdowns to set your source and target units. Click Swap to reverse them in one step.
- Convert and read the result
- Click Convert or press Enter. The result appears as a readable line and you can copy it with Copy result.
- See all equivalents and export CSV
- Below the result, you’ll see a table listing every unit in the chosen category with its value. Click Download CSV to save the table as Unit, Symbol, and Value for your records.
Why FlexiTools.io Offers the Best Unit Converter
Fast, local, and precise
Everything runs in your browser, so your inputs stay on your device. You get instant conversions with sensible formatting for small and large numbers.
Five core categories in one tool
Convert length, weight, temperature, data, and time without switching tabs. The tool remembers smart defaults for each category to speed you up.
Clear result plus full table
You get both - a clean “A = B” result you can copy, and a full table of equivalents you can export to CSV.
Keyboard-friendly and easy to fix
Press Enter to convert. Used the wrong direction? Tap Swap and try again.
FlexiTools.io vs typical alternatives
- FlexiTools.io: Local, instant results - Alternatives: Slower loads or extra steps
- FlexiTools.io: One-click Swap and Copy result - Alternatives: Manual re-entry
- FlexiTools.io: Full category table with CSV export - Alternatives: Single-line result only
- FlexiTools.io: Simple status messages - Alternatives: Vague or no feedback
A Deeper Look at Units, Scales, and Conversion Accuracy
Ratios vs offsets - why temperature is special
Most conversions are simple ratios. Length, weight, data (in the same prefix system), and time units scale by fixed factors - multiply to go to a base unit, divide to reach the target. For example, 1 meter = 100 centimeters and 1 kilogram = 1,000 grams, so the math is straightforward.
Temperature adds an offset. Celsius and Fahrenheit do not share the same zero point, and Kelvin starts at absolute zero. That’s why the tool uses dedicated formulas for temperature: it converts any input to a base (Celsius) before moving to the target. This two-step approach prevents common mistakes like treating temperature as a pure ratio.
Decimal vs binary data units
You’ll often see two families of data units:
- Decimal prefixes - KB, MB, GB, TB as powers of 10 (1 KB = 1,000 bytes).
- Binary prefixes - KiB, MiB, GiB, TiB as powers of 2 (1 KiB = 1,024 bytes).
Why both? Storage makers usually use decimal. Operating systems often show binary. The tool includes both, and also supports bits and bit-based prefixes (kb, Mb, Gb, Tb). That makes it easy to compare a spec sheet with what a system reports and explain the difference to a teammate or client.
Choosing good defaults - and why Swap helps
Defaults matter. For length, the tool starts at meters-to-kilometers, for weight it’s kilograms-to-pounds, and for temperature it’s Celsius-to-Fahrenheit. These pairings cover common day-to-day checks. If you need the reverse, Swap flips the units in one click. That saves typing and avoids small mistakes, especially on mobile.
Precision, formatting, and very large or small values
Conversion is only half the task - making results readable is just as important. The tool formats numbers with up to 10 significant digits and switches to scientific notation for very large or very small outputs. That keeps the table compact while preserving meaning. Curious about the mechanics of formatting? MDN’s guide to number formatting explains how software presents numbers in a friendly way. And if you’ve ever wondered why tiny rounding quirks appear in some tools, MDN’s overview of floating-point precision is a helpful primer.
Time is simple - until calendars enter the chat
Time units in this tool use fixed seconds: milliseconds, seconds, minutes, hours, days, and weeks. That covers timers, durations, and throughput. Calendar units like months and years are trickier because their length varies. For consistent results, convert with fixed units here, then decide how to interpret the duration in a calendar context if needed.
A quick example you can relate to
Say you’re prepping print specs for a sign. You have a 2.4 meter width from the client, but your template needs feet and inches. Enter 2.4, set From to meters and To to feet, and click Convert. Copy result gives you the quick line for your notes. Scroll the table and you’ll see inches, yards, and miles too. If the client flips to imperial, click Swap and you’re done in a second.
Confidence through transparency
A trustworthy converter shows its work. This interface gives you a clear result line plus a full table of equivalents in the same category, so you can spot-check edge cases. If a value looks off, change the category or units and compare. Simple status messages - Converted, Cleared, Copied - confirm each action so you always know what happened.
Pro-Tips for Getting the Most Out of Unit Conversion
- Use Swap after a quick check - it’s the fastest way to reverse a conversion without retyping.
- Export the CSV when you need to share or audit a calculation set - it includes Unit, Symbol, and Value columns for the whole category.
- For temperature, double-check the target system used in your specs. Celsius, Fahrenheit, and Kelvin solve different needs.