Thermocouple mV ↔ °C
Convert between thermoelectric voltage and temperature with the NIST ITS-90 reference functions and inverse polynomials, reference junction at 0 °C. Each inverse result shows the error band NIST publishes for it.
Thermocouple · NIST ITS-90
v0.1.0 · SRD 60Type
Type K is live. J, T, E, N, R, S and B are next.
Type K temperature99.96 °CNIST inverse error band for this range: -0.05 to +0.04 °C
Source: NIST ITS-90 Thermocouple Database (SRD 60) · valid −270 to 1372 °C
Test vectors for this tool
The reference cases this calculator is tested against on every change. Use them to check your own software. All test vectors · Download JSON
| ID | Inputs | Expected | Tolerance | Source |
|---|---|---|---|---|
| TCK-F-01 | type = K, t_C = -200 | -5.891 mV | ± 0.0005 | NIST SRD 60 type K table, -200 °C |
| TCK-F-02 | type = K, t_C = -100 | -3.554 mV | ± 0.0005 | NIST SRD 60 type K table, -100 °C |
| TCK-F-03 | type = K, t_C = -50 | -1.889 mV | ± 0.0005 | NIST SRD 60 type K table, -50 °C |
| TCK-F-04 | type = K, t_C = 0 | 0 mV | ± 0.0005 | NIST SRD 60 type K table, 0 °C |
| TCK-F-05 | type = K, t_C = 25 | 1 mV | ± 0.0005 | NIST SRD 60 type K table, 25 °C |
| TCK-F-06 | type = K, t_C = 100 | 4.096 mV | ± 0.0005 | NIST SRD 60 type K table, 100 °C |
| TCK-F-07 | type = K, t_C = 200 | 8.138 mV | ± 0.0005 | NIST SRD 60 type K table, 200 °C |
| TCK-F-08 | type = K, t_C = 500 | 20.644 mV | ± 0.0005 | NIST SRD 60 type K table, 500 °C |
| TCK-F-09 | type = K, t_C = 1000 | 41.276 mV | ± 0.0005 | NIST SRD 60 type K table, 1000 °C |
| TCK-F-10 | type = K, t_C = 1372 | 54.886 mV | ± 0.0005 | NIST SRD 60 type K table, 1372 °C |
| TCK-I-01 | type = K, emf_mV = -5.891 | -200 °C | ± 0.08 | NIST SRD 60 type K table, -200 °C |
| TCK-I-02 | type = K, emf_mV = -3.554 | -100 °C | ± 0.06 | NIST SRD 60 type K table, -100 °C |
| TCK-I-03 | type = K, emf_mV = 0 | 0 °C | ± 0.06 | NIST SRD 60 type K table, 0 °C |
| TCK-I-04 | type = K, emf_mV = 4.096 | 100 °C | ± 0.06 | NIST SRD 60 type K table, 100 °C |
| TCK-I-05 | type = K, emf_mV = 20.644 | 500 °C | ± 0.08 | NIST SRD 60 type K table, 500 °C |
| TCK-I-06 | type = K, emf_mV = 41.276 | 1000 °C | ± 0.08 | NIST SRD 60 type K table, 1000 °C |
| TCK-I-07 | type = K, emf_mV = 54.886 | 1372 °C | ± 0.08 | NIST SRD 60 type K table, 1372 °C |
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