Unit Converter
Convert length, area, mass, temperature, volume, speed, pressure, energy, and data units
Unit Converter — what it does
Convert between units across nine categories: length, area, mass, temperature, volume, speed, pressure, energy and data. Pick a category, enter a value and choose the units, and the conversion uses the standard definitions rather than the rounded approximations people carry in their heads.
When this tool helps
- Converting measurements between metric and imperial for a supplier, recipe or specification.
- Translating a data size, transfer rate or storage figure between units.
- Checking a temperature, pressure or energy value quoted in an unfamiliar unit.
How to use it
- Choose the unit category.
- Enter the value to convert.
- Select the source and target units.
- Read the converted value.
Accuracy, limits, and good practice
- Temperature is the exception: it has an offset as well as a scale, so 0°C is 32°F rather than 0°F, and a difference in degrees converts differently from a temperature.
- Data units are ambiguous by convention — a kilobyte can mean 1000 or 1024 bytes depending on who is counting, and drive manufacturers use the smaller one.
- Rounding accumulates through chained conversions; convert once from the original value rather than in steps.
Frequently asked questions
Are US and imperial gallons the same?
No. A US gallon is about 3.79 litres and an imperial gallon about 4.55 — a difference large enough to ruin a recipe or a fuel calculation.
Why do storage sizes never match the box?
Manufacturers count a terabyte as a trillion bytes while operating systems often count in powers of two, which loses roughly seven percent on the label.
How precise are the conversions?
They use standard definitions, so the results are exact within display rounding.
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Everything above runs inside this page. Unit Converter needs no account, no upload, and no server round trip — close the tab and nothing is left behind.
綜合單位轉換器能做什麼
在長度、面積、重量、溫度、體積、速度、壓力、能量與資料容量九大類之間換算單位。選好類別、輸入數值、指定來回單位，換算會採用標準定義，而不是大家腦中那些四捨五入的近似值。
什麼時候用得上
- 為供應商、食譜或規格在公制與英制之間換算。
- 換算資料大小、傳輸速率或儲存容量的單位。
- 確認以陌生單位標示的溫度、壓力或能量數值。
使用步驟
- 選擇單位類別。
- 輸入要換算的數值。
- 選擇來源與目標單位。
- 查看換算結果。
精確度、限制與實務建議
- 溫度是例外：它除了比例還有偏移量，所以 0°C 是 32°F 而不是 0°F，而「溫差」的換算方式又與「溫度」不同。
- 資料單位在慣例上有歧義——KB 可能指 1000 或 1024 位元組，硬碟廠商用的是較小的那個。
- 連續換算會累積捨入誤差；請從原始數值一次換算，而不是分段換。
常見問題
美制加侖與英制加侖一樣嗎？
不一樣。美制加侖約 3.79 公升、英制約 4.55 公升——差距大到足以毀掉一份食譜或油耗計算。
為什麼硬碟容量總是對不上包裝？
廠商把 TB 算成一兆位元組，作業系統常以二的次方計算，標示上因此少了約 7%。
換算有多精確？
採用標準定義，結果在顯示位數的捨入範圍內是精確的。
本站相關工具
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- 薪資換算器 — 在時薪、週薪、月薪與年薪之間進行換算
- 廣告指標計算器 — 計算 CTR、CPC、CPM、CPA、轉換率與 ROAS
以上步驟全部在這個頁面內完成，綜合單位轉換器 不需要註冊、不上傳檔案、也不經過伺服器，關閉分頁後不會留下任何資料。