According to Home Guides, a ceiling fan uses somewhere between 0.5 and 1 amp. When compared to other cooling methods, such as air conditioning, ceiling fans use significantly less power.
In most cases, the exact amp usage of a ceiling fan will be known by the fan's manufacturer. The easiest way to find out the exact amount of amps that a ceiling fan uses is to contact the manufacturer. The amount of amps used can of course depend on certain factors, such as its speed and type. One amp used by a ceiling fan is approximately equivalent to 120 watts of electricity.