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Delisle to Rankine Converter

Convert Delisle to Rankine and Rankine to Delisle instantly. Bidirectional temperature converter with formula and common values.

°De

Rankine

617.67

°R

45 °De = 617.67 °R

°R = (373.15 − °De × 2/3) × 9/5

Delisle to Rankine: To convert delisle to rankine, apply °R = (373.15 − °De × 2/3) × 9/5. Unlike linear unit conversions, delisle and rankine use different zero points, so a fixed multiplier is not sufficient.

How to Convert Delisle to Rankine

Converting between delisle and rankine requires both a scale factor and an offset because the two scales use different zero points. The formula below handles both adjustments.

Conversion Formula

  • Delisle to Rankine: °R = (373.15 − °De × 2/3) × 9/5
  • Rankine to Delisle: °De = (373.15 − °R × 5/9) × 3/2

Delisle to Rankine Conversion Chart

Delisle (°De)Rankine (°R)
0.1671.55
0.25671.37
0.5671.07
1670.47
2669.27
3668.07
5665.67
10659.67
20647.67
25641.67
50611.67
100551.67
250371.67
1000-528.33

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FAQ

How do you convert Delisle to Rankine?

First convert Delisle to Kelvin using K = 373.15 − °De × 2/3, then multiply by 9/5 to get Rankine. For example, 45°De: (373.15 − 45 × 2/3) × 9/5 = 617.67°R.

What is the Delisle temperature scale?

The Delisle scale was invented by Joseph-Nicolas Delisle in 1732. It runs in reverse: higher Delisle values mean colder temperatures. Water boils at 0°De and freezes at 150°De.

What is 0 Delisle in Rankine?

0°De (the boiling point of water) equals 671.67°R.

Why does the Delisle scale run backwards?

Delisle originally measured the contraction of mercury from the boiling point of water. As temperature drops, mercury contracts more, giving higher readings. This reverse convention was kept.

How do you convert rankine back to delisle?

Use the inverse formula: °De = (373.15 − °R × 5/9) × 3/2.

Why isn't delisle-to-rankine a simple multiplication?

Delisle and Rankine use different zero points, so the relationship includes both a scale factor and an offset. The scale factor alone gives the rate of change but not the absolute value.