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出典と基準
下の文書を、それぞれの機関の公式サイトで直接開いて確認しました。確認日は 2026-11-09 です。基準は変わることがあるため、重要な判断の前には原文を再確認してください。
長さ変換
- BIPM, The International System of Units (SI Brochure), 9th edition
Section 2.3 (definitions of metre, kilogram, second), Section 3 Table 7 (SI prefixes), Section 4 Table 8 (non-SI units) · 9th edition (2019), v4.01 June 2026 - NIST Handbook 44 (2026), Appendix C: General Tables of Units of Measurement
Tables of equivalents, C-3 to C-30 · 2026 Edition (January 2026) - NIST, Ending the Era of the U.S. Survey Foot (1959 to 2022)
Retirement of the U.S. survey foot · read 2026-11-09 - KRISS(한국표준과학연구원), 표준이야기 > 단위와 환산 > 척관법 단위의 환산
길이·면적·질량·부피 표 · 게시일 불명 (2026-11-09 확인) - 計量法施行法（昭和26年法律第208号）第4条・第5条
尺貫法の計量単位の定義 · 昭和26年(1951) 制定 (廃止済み・歴史的定義) - 計量法（平成4年法律第51号）
第8条（非法定計量単位の取引・証明での使用禁止）、別表第一 · 2025-06-01 施行の改正を確認
重さ（質量）変換
- BIPM, The International System of Units (SI Brochure), 9th edition
Section 2.3 (definitions of metre, kilogram, second), Section 3 Table 7 (SI prefixes), Section 4 Table 8 (non-SI units) · 9th edition (2019), v4.01 June 2026 - NIST Handbook 44 (2026), Appendix C: General Tables of Units of Measurement
Tables of equivalents, C-3 to C-30 · 2026 Edition (January 2026) - UK Weights and Measures Act 1985, Schedule 1
Parts IV, V, VI (units of measurement). Part VI defines units that may not be used for trade except as supplementary indications; legislation.gov.uk lists Schedule 1 as due to be omitted by 2025 c. 20 s. 11(3), so check the current text · as amended (read 2026-11-09) - KRISS(한국표준과학연구원), 표준이야기 > 단위와 환산 > 척관법 단위의 환산
길이·면적·질량·부피 표 · 게시일 불명 (2026-11-09 확인) - 計量法（平成4年法律第51号）
第8条（非法定計量単位の取引・証明での使用禁止）、別表第一 · 2025-06-01 施行の改正を確認
温度変換
- BIPM, The International System of Units (SI Brochure), 9th edition
Section 2.3 (definitions of metre, kilogram, second), Section 3 Table 7 (SI prefixes), Section 4 Table 8 (non-SI units) · 9th edition (2019), v4.01 June 2026 - NIST SP 811, Guide for the Use of the International System of Units (SI), Appendix B (Conversion Factors) and footnotes
B.5, B.8 and footnotes · Updated 2025-08-18
面積変換
- BIPM, The International System of Units (SI Brochure), 9th edition
Section 2.3 (definitions of metre, kilogram, second), Section 3 Table 7 (SI prefixes), Section 4 Table 8 (non-SI units) · 9th edition (2019), v4.01 June 2026 - NIST Handbook 44 (2026), Appendix C: General Tables of Units of Measurement
Tables of equivalents, C-3 to C-30 · 2026 Edition (January 2026) - KRISS(한국표준과학연구원), 표준이야기 > 단위와 환산 > 척관법 단위의 환산
길이·면적·질량·부피 표 · 게시일 불명 (2026-11-09 확인) - 計量法施行法（昭和26年法律第208号）第4条・第5条
尺貫法の計量単位の定義 · 昭和26年(1951) 制定 (廃止済み・歴史的定義) - 不動産公正取引協議会連合会「不動産の表示に関する公正競争規約施行規則」
第9条(16) 畳数の表示 · 2026-11-09 確認 - 計量法（平成4年法律第51号）
第8条（非法定計量単位の取引・証明での使用禁止）、別表第一 · 2025-06-01 施行の改正を確認
体積（容量）変換
- BIPM, The International System of Units (SI Brochure), 9th edition
Section 2.3 (definitions of metre, kilogram, second), Section 3 Table 7 (SI prefixes), Section 4 Table 8 (non-SI units) · 9th edition (2019), v4.01 June 2026 - NIST Handbook 44 (2026), Appendix C: General Tables of Units of Measurement
Tables of equivalents, C-3 to C-30 · 2026 Edition (January 2026) - UK Weights and Measures Act 1985, Schedule 1
Parts IV, V, VI (units of measurement). Part VI defines units that may not be used for trade except as supplementary indications; legislation.gov.uk lists Schedule 1 as due to be omitted by 2025 c. 20 s. 11(3), so check the current text · as amended (read 2026-11-09) - KRISS(한국표준과학연구원), 표준이야기 > 단위와 환산 > 척관법 단위의 환산
길이·면적·질량·부피 표 · 게시일 불명 (2026-11-09 확인) - 計量法（平成4年法律第51号）
第8条（非法定計量単位の取引・証明での使用禁止）、別表第一 · 2025-06-01 施行の改正を確認
速度変換
- BIPM, The International System of Units (SI Brochure), 9th edition
Section 2.3 (definitions of metre, kilogram, second), Section 3 Table 7 (SI prefixes), Section 4 Table 8 (non-SI units) · 9th edition (2019), v4.01 June 2026 - NIST SP 811, Guide for the Use of the International System of Units (SI), Appendix B (Conversion Factors) and footnotes
B.5, B.8 and footnotes · Updated 2025-08-18 - NIST Handbook 44 (2026), Appendix C: General Tables of Units of Measurement
Tables of equivalents, C-3 to C-30 · 2026 Edition (January 2026)
燃費変換
- NIST SP 811, Guide for the Use of the International System of Units (SI), Appendix B (Conversion Factors) and footnotes
B.5, B.8 and footnotes · Updated 2025-08-18
圧力変換
- BIPM, The International System of Units (SI Brochure), 9th edition
Section 2.3 (definitions of metre, kilogram, second), Section 3 Table 7 (SI prefixes), Section 4 Table 8 (non-SI units) · 9th edition (2019), v4.01 June 2026 - NIST SP 811, Guide for the Use of the International System of Units (SI), Appendix B (Conversion Factors) and footnotes
B.5, B.8 and footnotes · Updated 2025-08-18
エネルギー（熱量）変換
- BIPM, The International System of Units (SI Brochure), 9th edition
Section 2.3 (definitions of metre, kilogram, second), Section 3 Table 7 (SI prefixes), Section 4 Table 8 (non-SI units) · 9th edition (2019), v4.01 June 2026 - NIST SP 811, Guide for the Use of the International System of Units (SI), Appendix B (Conversion Factors) and footnotes
B.5, B.8 and footnotes · Updated 2025-08-18
仕事率・馬力変換
- BIPM, The International System of Units (SI Brochure), 9th edition
Section 2.3 (definitions of metre, kilogram, second), Section 3 Table 7 (SI prefixes), Section 4 Table 8 (non-SI units) · 9th edition (2019), v4.01 June 2026 - NIST SP 811, Guide for the Use of the International System of Units (SI), Appendix B (Conversion Factors) and footnotes
B.5, B.8 and footnotes · Updated 2025-08-18
時間変換
- BIPM, The International System of Units (SI Brochure), 9th edition
Section 2.3 (definitions of metre, kilogram, second), Section 3 Table 7 (SI prefixes), Section 4 Table 8 (non-SI units) · 9th edition (2019), v4.01 June 2026 - NIST SP 811, Guide for the Use of the International System of Units (SI), Appendix B (Conversion Factors) and footnotes
B.5, B.8 and footnotes · Updated 2025-08-18
データ容量変換
- NIST, Prefixes for binary multiples
Table of binary prefixes and examples · undated page - BIPM, The International System of Units (SI Brochure), 9th edition
Section 2.3 (definitions of metre, kilogram, second), Section 3 Table 7 (SI prefixes), Section 4 Table 8 (non-SI units) · 9th edition (2019), v4.01 June 2026
料理の計量変換（国別のカップ・スプーン）
- BIPM, The International System of Units (SI Brochure), 9th edition
Section 2.3 (definitions of metre, kilogram, second), Section 3 Table 7 (SI prefixes), Section 4 Table 8 (non-SI units) · 9th edition (2019), v4.01 June 2026 - 농촌진흥청 농식품올바로, 한식양념장 > 기초조리의 이해 > 식재료 계량하기
1컵 200 mL, 1큰술 15 mL, 1작은술 5 mL, 종이컵 약 180 mL · 2026-11-09 확인 - 国立健康・栄養研究所「重量目安表（2009年版）」
計量カップ200ml、小さじ5ml、大さじ15ml · 2009年9月（2013年7月改訂） - 農林水産省 近畿農政局「おいしい「ごはん」の炊き方（炊飯器編）」
計量カップ（180ml。炊飯器に付属） · 2018年作成のPDF - NIST Handbook 44 (2026), Appendix C: General Tables of Units of Measurement
Tables of equivalents, C-3 to C-30 · 2026 Edition (January 2026) - U.S. FDA, 21 CFR 101.9 (Nutrition labeling of food)
(b)(5)(viii) household measures: teaspoon 5 mL, tablespoon 15 mL, cup 240 mL, fluid ounce 30 mL · eCFR 2026-11-01 version (read 2026-11-09) - Health Canada, Canada's Food Guide: Measure ingredients like a pro
Conversion table (cup 250 mL, tablespoon 15 mL, teaspoon 5 mL) · 2026-11-09 accessed - UK Weights and Measures Act 1985, Schedule 1
Parts IV, V, VI (units of measurement). Part VI defines units that may not be used for trade except as supplementary indications; legislation.gov.uk lists Schedule 1 as due to be omitted by 2025 c. 20 s. 11(3), so check the current text · as amended (read 2026-11-09) - NIST Office of Weights and Measures, Metric Kitchen: Cooking Measurement Equivalencies
Approximate home-cooking equivalents · Updated 2026-04-29
靴のサイズ（足の長さ）変換
- BIPM, The International System of Units (SI Brochure), 9th edition
Section 2.3 (definitions of metre, kilogram, second), Section 3 Table 7 (SI prefixes), Section 4 Table 8 (non-SI units) · 9th edition (2019), v4.01 June 2026 - NIST Handbook 44 (2026), Appendix C: General Tables of Units of Measurement
Tables of equivalents, C-3 to C-30 · 2026 Edition (January 2026) - ISO 19407:2023, Footwear — Sizing — Conversion of sizing systems
Abstract: conversion tables based on foot length (full text not read) · 2023 (abstract only) - 국가기술표준원(KATS), 법정단위 FAQ
비법정단위 목록과 환산표 · 2026-11-09 확인
服のサイズ（身体寸法）変換
- BIPM, The International System of Units (SI Brochure), 9th edition
Section 2.3 (definitions of metre, kilogram, second), Section 3 Table 7 (SI prefixes), Section 4 Table 8 (non-SI units) · 9th edition (2019), v4.01 June 2026 - NIST Handbook 44 (2026), Appendix C: General Tables of Units of Measurement
Tables of equivalents, C-3 to C-30 · 2026 Edition (January 2026)
為替レート計算（通貨換算）
- European Central Bank, euro foreign exchange reference rates
eurofxref-daily.xml · daily, about 16:00 CET
使っていないもの・明示したもの
- 定義ではない近似値（例: mmHg）は近似値と明示しています。
- 1951年の計量法施行法は現在は廃止された法律のため、歴史的な定義としてのみ示します。
- 日本語版の畳は、単位の定義ではなく、不動産広告の規約にある最小面積の基準（1畳あたり1.62㎡以上）です。
- 正確な定義から当サイトが計算した値（英mpgの定数、psiや馬力のワット値など）は「算出値」と明示します。