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.
数字を英語の単語表現に変換。
メートル法とヤード・ポンド法の長さ単位を変換。
メートル法とヤード・ポンド法の重量単位を変換。
摂氏、華氏、ケルビン間で温度を変換。
異なる速度単位間で変換。
異なる面積単位間で変換。
異なるタイムゾーン間で時間を変換。
異なる体積単位間で変換。
バイト、KB、MB、GB、TB 間で変換。
異なる時間単位間で変換。
異なる圧力単位間で変換。
ローマ数字とアラビア数字を相互変換。
世界各国の通貨間で換算。
各国の靴サイズ規格間で換算。
異なる GPS 座標形式間で変換。
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.