What changes
21.0, 21.5, 22.0 and 22.5 °C become 42, 43, 44 and 45 °G. Whole-number settings can be faster to scan and compare.
Design rationale
Why Galliera?
A simple rescaling of Celsius can change how everyday temperatures feel to read and set — without changing the underlying measurement.
Core idea
Simple on purpose.
The Galliera scale is not a new thermodynamic quantity, new calibration method, or claim of extra precision. It is a numerical rescaling of Celsius intended for human-facing communication.
TG = 2TC
For numerical scale readings, multiply Celsius by two or divide Galliera by two. The Celsius zero point remains zero: 0 °G = 0 °C. For interval size, 1 °G = 0.5 °C.
4020.0°C
4120.5°C
4221.0°C
4321.5°C
4422.0°C
4522.5°C
The practical motivation
Half a Celsius degree becomes one whole °G.
Many thermostats and HVAC interfaces use 0.5 °C increments. Galliera maps the same sequence onto consecutive integers. The information content is identical; the display convention is different.
What does not change
A sensor that resolves 0.5 °C resolves 1 °G. Galliera does not magically make the sensor more accurate or precise.
A second design advantage
Galliera is finer in whole numbers than both Celsius and Fahrenheit.
This statement has a precise meaning: keep the physical temperature span identical, then count one-degree intervals. It is a property of the notation—not a claim that the physical measurement has become more accurate.
Same physical spanCelsiusFahrenheitGalliera
0 → 40 °C
common human/environmental span407280
common human/environmental span407280
0 → 50 °C
extended hot-weather span5090100
extended hot-weather span5090100
Water: freezing → boiling
at 1 atm100180200
at 1 atm100180200
How to read the numbers: a span from 0 to 40 contains 40 one-degree intervals, although there are 41 integer labels if both endpoints are counted.
2×
versus Celsius
Galliera gives twice as many whole-degree intervals across every identical physical span. A 0.5 °C change becomes exactly 1 °G.
+11.1%
versus Fahrenheit
A Galliera degree is 10% smaller than a Fahrenheit degree, so an identical physical span contains about 11.1% more whole-degree intervals.
0
still means freezing
Unlike Fahrenheit, Galliera keeps the intuitive Celsius zero reference: 0 °G = 0 °C.
The combined design claim: Galliera preserves Celsius's simple zero and direct conversion, yet offers more whole-number granularity than Fahrenheit for the same physical range.
Design choice
Familiar, without copying Fahrenheit.
Several possible formulas could have made Galliera resemble Fahrenheit more closely. The final design rejected offsets and extra arithmetic in favor of an exact factor of two.
Zero still means freezing
The familiar Celsius reference remains intact: 0 °G = 0 °C.
Everyday values spread out
Room temperature is around 40–44 °G, body temperature is around 74 °G, and extreme outdoor heat can approach 100 °G.
Conversion stays mental
No offset is needed between Galliera and Celsius: simply multiply or divide by two.
Design philosophy: if the human-interface benefit required a complicated formula, the scale would lose much of its reason to exist.
Why the letter G?
The symbol has a story.
The mathematical definition came first. The letter G then fit the concept in several satisfying ways. These are mnemonics and design rationales, not part of the physics.
G
Galliera
Like Celsius, Fahrenheit, Kelvin and Rankine, the name follows the historical convention of an eponymous temperature scale.
C→G
Visual kinship
In many typefaces, a capital G resembles a C with an added stroke — apt for a scale derived directly from Celsius.
F G H
Alphabetic mnemonic
G follows F, a small mnemonic connection to Fahrenheit, and precedes H — an informal reminder of the scale's human-centered goal.
Paris
Cultural coincidence
Palais Galliera is the fashion museum of Paris. It is unrelated to the temperature scale; the shared name is simply an interesting coincidence.
Non-goals
What Galliera does not claim.
Clear limits are part of the proposal.
Is Galliera an SI unit?
No. Kelvin remains the SI base unit for thermodynamic temperature, and Celsius remains a standard SI-derived way of expressing temperature.
Is it more accurate than Celsius?
No. It changes numerical representation, not the underlying measurement or sensor quality.
Does 100 °G mean a maximum?
No. It is simply 50 °C / 122 °F, a memorable extreme-weather reference. The scale has no special upper limit.
Is body temperature always 74 °G?
No. 74 °G = 37 °C is a familiar nominal reference. Human body temperature varies by person, measurement method and time of day.