The amperage of 18 gauge wire depends on the type of insulation and the number of conductors in the wire. You can read our content and also benefit from other resources to make the most delicious amperage of 18 gauge wire.
18 AWG wire is good for up to 10 amps, 16 AWG for up to 13 amps, 14 AWG for up to 15 amps, 12 AWG for up to 20 amps and 10 AWG for up to 30 amps.
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https://www.alliedelec.com/Knowledge-Center/Wire-Gauge-Chart-and-Ampacity-Table