What is -273.15 °C in kelvin?

-273.15 Celsius is equal to 0.00 kelvin.

What is −273.15 °C in kelvin?

−273.15 °C equals exactly 0 K (absolute zero). This is the lowest possible temperature, where a system has its minimum thermal energy. The Kelvin scale is defined so that 0 K = −273.15 °C exactly.

How do you calculate the conversion?

The formula is K = °C + 273.15. Plugging in: -273.15 + 273.15 = 0.00 K.

Is -273.15 °C hot or cold?

-273.15 °C (0.00 K) is an extreme cold temperature, dangerous without proper protection. Exposed skin can develop frostbite within minutes.

-273.15 Celsius to Kelvin (°C to K) – Instant & Accurate

Last updated: February 28, 2026

-273.15 °C = 0.00 K

Using the formula K = °C + 273.15: -273.15 + 273.15 = 0.00 K

Temperature Converter

Celsius (°C)

Kelvin (K)

How to convert from Celsius to Kelvin

It is easy to convert a temperature value from Celsius to Kelvin by using the formula below:

K = °C + 273.15

To change -273.15° Celsius to Kelvin, just add 273.15 to the Celsius value.

Step-by-step Solution:

Write down the formula: K = °C + 273.15
Plug the value in the formula: -273.15 + 273.15
Add 273.15: 0.00 (answer)

Nearby Conversions

Celsius to Kelvin Conversion Table (1–100 °C)

Celsius	Kelvin	Celsius	Kelvin
1	274.15	2	275.15
3	276.15	4	277.15
5	278.15	6	279.15
7	280.15	8	281.15
9	282.15	10	283.15
11	284.15	12	285.15
13	286.15	14	287.15
15	288.15	16	289.15
17	290.15	18	291.15
19	292.15	20	293.15
21	294.15	22	295.15
23	296.15	24	297.15
25	298.15	26	299.15
27	300.15	28	301.15
29	302.15	30	303.15
31	304.15	32	305.15
33	306.15	34	307.15
35	308.15	36	309.15
37	310.15	38	311.15
39	312.15	40	313.15
41	314.15	42	315.15
43	316.15	44	317.15
45	318.15	46	319.15
47	320.15	48	321.15
49	322.15	50	323.15
51	324.15	52	325.15
53	326.15	54	327.15
55	328.15	56	329.15
57	330.15	58	331.15
59	332.15	60	333.15
61	334.15	62	335.15
63	336.15	64	337.15
65	338.15	66	339.15
67	340.15	68	341.15
69	342.15	70	343.15
71	344.15	72	345.15
73	346.15	74	347.15
75	348.15	76	349.15
77	350.15	78	351.15
79	352.15	80	353.15
81	354.15	82	355.15
83	356.15	84	357.15
85	358.15	86	359.15
87	360.15	88	361.15
89	362.15	90	363.15
91	364.15	92	365.15
93	366.15	94	367.15
95	368.15	96	369.15
97	370.15	98	371.15
99	372.15	100	373.15

Related Temperature Conversions

Temperature Converters

Popular Celsius to Kelvin conversions

More Temperature Conversions

1 K → °F

Absolute Zero

−273.15 °C is absolute zero (0 K), the lowest temperature permitted by the laws of thermodynamics. At this point, a perfect crystal would have zero entropy (Third Law of Thermodynamics, formalized by Walther Nernst in 1906). In practice, quantum mechanics requires that particles retain zero-point energy even at 0 K, so thermal motion never fully stops. The current experimental record, achieved using nuclear adiabatic demagnetization, has brought matter to within 100 picokelvin of absolute zero.

Data Accuracy

The Kelvin is the SI base unit for thermodynamic temperature, defined since 2019 by fixing the Boltzmann constant at exactly 1.380 649 × 10⁻²³ J/K. All conversions on this page apply the relation K = °C + 273.15, computed in double-precision floating point and rounded to one decimal place for display.

About This Page

Content maintained by the CelsiusFahrenheit.co editorial team. All conversions follow the International Temperature Scale of 1990 (ITS-90) as defined by the Bureau International des Poids et Mesures (BIPM). Calculations use IEEE 754 double-precision arithmetic. Last reviewed: February 2026.