Free online unit converters for length, weight, temperature, speed, area, volume, data storage, time, pressure, and more. Also includes specialized converters: shoe size converter (US, UK, EU, CM), bra size calculator, ring size calculator, online ruler (pixel/cm/inches), coordinate converter (GPS DD/DMS/DDM/UTM), world clock, timezone converter, and Roman numeral converter. All conversions use standard formulas and reference tables.
將數字轉換為英文或中文文字表示。
在公制與英制長度單位之間轉換。
在公制與英制重量單位之間轉換。
在攝氏、華氏與克氏溫度之間轉換。
在不同速度單位之間轉換。
在不同面積單位之間轉換。
在不同時區之間轉換時間。
在不同體積單位之間轉換。
在 Byte、KB、MB、GB、TB 之間轉換。
在不同時間單位之間轉換。
在不同壓力單位之間轉換。
在羅馬數字與阿拉伯數字之間轉換。
在世界各國貨幣之間換算。
在不同國家的鞋碼標準之間換算。
在不同 GPS 座標格式之間轉換。
Ideal for cooking and baking measurements, DIY and construction projects, travel and navigation, online shopping for international sizes, scientific calculations, fitness tracking, and clothing size conversions.
All conversions use internationally standardized conversion factors. Length, weight, and temperature converters use NIST-tested formulas. Currency converter uses live exchange rates updated every 10 minutes.
Yes. Every unit converter supports both metric (SI) and imperial/US customary units, with full cross-conversion between systems. Results include all supported units for easy comparison.
Stand on a piece of paper, trace your foot, measure from heel to longest toe in centimeters, and use our shoe size converter. We support US, UK, EU, and CM sizing for men, women, and kids.
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Every tool works in your browser — no sign-up, no data collection.