rからcへの変換 (°R → °C)

1 °R = -272.594444°C. 測定カテゴリ間をスムーズに切り替え、リアルタイムで全単位マトリックスを計算し、瞬時に結果をコピーできます。

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温度 Converter

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Formula: --

⚡ All Temperature Scales

Real-time simultaneous conversions across standard thermodynamic and regional scales.

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Celsius

Metric standard (Water freezes at 0°, boils at 100°)

°C

-- °C

Fahrenheit

US customary scale (Water freezes at 32°, boils at 212°)

°F

-- °F

Kelvin

SI thermodynamic absolute zero reference

-- K

Rankine

Absolute thermodynamic scale using Fahrenheit increments

°R

-- °R

Réaumur

Historical scale (Water freezes at 0°, boils at 80°)

°Ré

-- °Ré

∑

Step-by-Step Mathematical Derivation

Verified SI Standard

➡️ Convert r to c

Value in °C = Value in °R × 0.5555556

To convert any quantity from r to c, multiply the quantity by the constant conversion factor 0.5555556.

⬅️ Convert c to r (Inverse)

Value in °R = Value in °C × 1.8

To reverse the operation, multiply your c figure by 1.8 (or divide by 0.5555556).

🔢 Step-by-Step Calculation Procedure:

Identify the starting value in r (°R).
Apply the exact linear conversion factor: 1 °R = 0.5555556 °C.
Multiply the input value by 0.5555556 to obtain the exact measurement in c (°C).
Verify precision against standard BIPM / NIST SP 811 statutory guidelines.

⚡

All-Units Instant Matrix

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c --

°C

f --

°F

k --

r --

°R

reaumur --

°Ré

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Temperature Reference Sheet

Standard SI Base Unit: 1 c

aiunitconverters.com

10/14/2026

Unit Name	Symbol	System	Equivalent in c
Celsius	°C	Standard	1 °C = 1 c
Fahrenheit	°F	Standard	1 °F = 0.5555555555555556 c
Kelvin	K	Standard	1 K = 1 c
Rankine	°R	Standard	1 °R = 0.5555555555555556 c
Réaumur	°Ré	Standard	1 °Ré = 1.25 c

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Academic & Research Citation Exporter

Cite this mathematical formula and conversion factor in research papers and wikis

BibTeX / APA / IEEE

@misc{ai_unit_converter_r_to_c,
  author       = {AI Unit Converters Standards Board},
  title        = {Exact r to c Conversion Factor and Mathematical Derivation},
  year         = {2026},
  howpublished = {\url{https://aiunitconverters.com/ja/temperature/r-to-c}},
  note         = {Derived from NIST Special Publication 811 and BIPM SI Brochure}
}

AI Unit Converters. (2026). r to c conversion formula & metric standard. Retrieved from https://aiunitconverters.com/ja/temperature/r-to-c

[1] AI Unit Converters Standards Board, "r to c conversion factor," 2026. [Online]. Available: https://aiunitconverters.com/ja/temperature/r-to-c. [Accessed: Oct 14, 2026].

\[ 1\text{ r} = \text{factor} \times 1\text{ c} \]

📊基準換算表

r (°R)c (°C)

-40°R	-295.3722°C
-20°R	-284.2611°C
0°R	-273.15°C
10°R	-267.5944°C
20°R	-262.0389°C
25°R	-259.2611°C
30°R	-256.4833°C
37°R	-252.5944°C
50°R	-245.3722°C
75°R	-231.4833°C
100°R	-217.5944°C
150°R	-189.8167°C
200°R	-162.0389°C
250°R	-134.2611°C
300°R	-106.4833°C
500°R	4.6278°C

c (°C)r (°R)

-40°C	419.67°R
-20°C	455.67°R
0°C	491.67°R
10°C	509.67°R
20°C	527.67°R
25°C	536.67°R
30°C	545.67°R
37°C	558.27°R
50°C	581.67°R
75°C	626.67°R
100°C	671.67°R
150°C	761.67°R
200°C	851.67°R
250°C	941.67°R
300°C	1,031.67°R
500°C	1,391.67°R