To convert 70 degrees Fahrenheit to Celsius, you can use the formula:
$$C = \frac{5}{9}(F - 32)$$
By substituting 70 for F, the calculation is as follows:
$$C = \frac{5}{9}(70 - 32)$$ $$C = \frac{5}{9}(38)$$ $$C = \frac{190}{9}$$ $$C ≈ 21.11$$
Therefore, 70 degrees Fahrenheit is equal to approximately 21.11 degrees Celsius.