Thermocouple calculator

Temperature

Convert temperature and mV. See how the cold junction changes the measured voltage.

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Set up the thermocouple

Thermocouple type

Extension jacket colors: confirm IEC or ANSI and the cable conductors. Do not identify the type by color alone.

Curve range: -270…1372 °C

Cold junction temperature °C

Reference terminal temperature. For voltage already referenced to 0 °C, use zero.

Decimal places in mV

Calculate from

Hot junction temperature

°C

Use a comma or decimal point. For negative values, tap +/−.

Thermocouple conversion

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Hot junction

300°C

Measured voltage

11.208mV

Reference at 0 °C12.209 mV

Cold junction · 25 °C1 mV

Measured voltage11.208 mV

Voltage × temperature curve

Type K · ITS-90

Calculated pointEqual junction temperatures: 0 mV

Explore the temperature

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-270 °C1372 °C

Local sensitivity: 41.446 µV/°C

NIST ITS-90 reference functions

Reference points

The measured voltage accounts for the specified cold junction.

°C	Reference at 0 °C mV	Measured voltage mV
-270	-6.458	-7.458
-200	-5.891	-6.892
-100	-3.554	-4.554
0	0	-1
100	4.096	3.096
200	8.138	7.138
300	12.209	11.208
400	16.397	15.397
500	20.644	19.644
600	24.905	23.905
700	29.129	28.129
800	33.275	32.275
900	37.326	36.326
1000	41.276	40.275
1100	45.119	44.118
1200	48.838	47.838
1300	52.41	51.41
1372	54.886	53.886

Calculated points, not measurements. This is not a calibration certificate.

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Thermocouple conversion

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Type K · Calculate from: Hot junction temperature · Cold junction: 25 °C

Hot junction

300 °C

Measured voltage

11.208 mV

E = E₀(T) − E₀(Tjf) ≈ 12.209 − (1) ≈ 11.208 mV

Local sensitivity: 41.446 µV/°C

Voltage × temperature curve

The measured voltage accounts for the specified cold junction.

Nominal ITS-90 functions, excluding instrument uncertainty, drift, cable errors and sensor tolerance. Inverse conversion numerically solves the same forward curve. Calculated points, not measurements. This is not a calibration certificate.

Reference points

°C	Reference at 0 °C (mV)	Measured voltage (mV)
-270	-6.458	-7.458
-200	-5.891	-6.892
-100	-3.554	-4.554
0	0	-1
100	4.096	3.096
200	8.138	7.138
300	12.209	11.208
400	16.397	15.397
500	20.644	19.644
600	24.905	23.905
700	29.129	28.129
800	33.275	32.275
900	37.326	36.326
1000	41.276	40.275
1100	45.119	44.118
1200	48.838	47.838
1300	52.41	51.41
1372	54.886	53.886