Temperature Coefficient of Resistance Calculator

When a conductor heats up or cools down, its electrical resistance changes — the Temperature Coefficient of Resistance Calculator tells you exactly how much. Enter your initial resistance value, TCR (in ppm/°C — copper is ~3930, platinum ~3850), reference temperature, and target temperature to get the final resistance at the new temperature. Secondary outputs include resistance change, percentage change, and the temperature difference between your two points.

ppm/°C

Typical values: Copper ~3930, Platinum ~3850, Carbon resistors -500 to -1000

°C

Standard reference temperature (usually 20°C or 25°C)

°C

Results

Final Resistance

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Resistance Change

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Percentage Change

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Temperature Difference

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Frequently Asked Questions

What is Temperature Coefficient of Resistance (TCR)?

TCR is the relative change of resistance value due solely to either the cooling or heating of a resistor. It is typically expressed in parts per million per degree Celsius (ppm/°C).

What are typical TCR values for common materials?

Copper has a TCR of approximately +3930 ppm/°C, platinum around +3850 ppm/°C, and carbon resistors typically range from -500 to -1000 ppm/°C. Positive values mean resistance increases with temperature.

Why is the reference temperature important?

The reference temperature is the baseline at which the initial resistance value is measured. Standard reference temperatures are usually 20°C or 25°C, and all calculations are relative to this point.

How do I interpret positive vs negative TCR values?

Positive TCR means resistance increases with temperature (like metals), while negative TCR means resistance decreases with temperature (like carbon or semiconductors).

What is the accuracy of TCR calculations?

TCR calculations are most accurate for small temperature changes. For large temperature differences, the linear approximation may introduce errors, and higher-order temperature effects should be considered.

Can I use this calculator for PT100 RTD sensors?

This calculator provides basic linear TCR calculations. For high-precision PT100 calculations, specialized tools that account for the Callendar-Van Dusen equation are recommended.

How does temperature affect electrical circuits?

Temperature changes can significantly affect circuit performance by altering resistance values. This impacts current flow, voltage drops, and overall circuit behavior, making temperature compensation important in precision applications.