To convert Jeff's height from centimeters to feet using the ratio 1 foot = 30.48 centimeters, you can use the following formula:
\[ \text{Height in feet} = \frac{\text{Height in centimeters}}{30.48} \]
Plugging in Jeff's height:
\[ \text{Height in feet} = \frac{183 \text{ cm}}{30.48 \text{ cm/foot}} \approx 6.003937 feet \]
Therefore, Jeff is approximately 6.00 feet tall.