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formula to work out pcb trace size?

hi. i am going to be making pcb's for some of my projects wich will include different voltages, amps etc. i am new to pcb making (although i have designed some in the past) and want to know what size i need to make my traces so that they are safe, for example: a 9v 500ma circuit will use smaller traces than a 240v 13a circuit. i was just wondering if there was a formula or website for working this out?
thanks in advance - luke

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seandogue6 years ago
Don't forget t6o calculate the minimum track spacing while you're at it, especially when you're running at 240V, where arcing is a real possibility with designs in which novices only consider current carrying capability.
kelseymh6 years ago
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+1
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