How many volts does a calculator give out?

I need to know how much volts a small calculator can give out to power an iPhone

A calculator runs on 1.5 volts, and you can't power an iPhone using that small amount of power.

I don't know why you'd want to use a calculator though.

Does your calculator have a USB port? If not, you might as well ask how to charge an iPhone by plugging it into a kitty litter box.

A USB port has 5 volts. The voltage must be the correct amount to charge any device, and 5 is the correct amount. The rate of charge and the chance of a current overload message are related to the current, not the voltage. Most USB ports provide about 500mA of current. The solution to current overload is a powered hub.

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