The conversion of -210 degrees Celsius to Fahrenheit can be calculated using the following formula:

°F = (°C × 9/5) + 32

Substituting the value -210°C into the formula, we get:

°F = (-210 × 9/5) + 32

°F = (-1890/5) + 32

°F = -378 + 32

°F = -346

Therefore, -210°C is equal to -346°F.