Resistor tolerance and self-heating
Estimate resistance at temperature including entered steady dissipation and thermal resistance.
Development preview. Check the assumptions below before relying on a result. Calculations run in your browser.
How it calculates
Model: T = Ta + Pθ; R(T) = Rref[1 + TCR(T−Tref)10⁻⁶]
Assumptions
- Dissipation is an independent fixed input, not recomputed from temperature-dependent R. Thermal resistance and linear TCR must come from the actual part and mounting.
Worked example
These are the calculator's default inputs. Change any input above to recalculate.
Inputs
- Reference resistance
- 1000 Ω
- Manufacturing tolerance
- 1 %
- Signed TCR
- 100 ppm
- Ambient temperature
- 25 °C
- Reference temperature
- 25 °C
- Applied steady dissipation
- 0.1 W
- Thermal resistance
- 100 K/W
Results
- Resistance at temperature
- 1001 Ω
- Estimated element temperature
- 35 °C
- Minimum resistance
- 990.99 Ω
- Maximum resistance
- 1011.01 Ω
- Thermal drift
- 1000 ppm