RV 30 amp vs 50 amp calculator: what can run at once?

Will the breaker trip? Tick what you want to run at the same time and see it against your campsite hookup: 30 amp, 50 amp or a household outlet.

Your hookup30 amp (TT-30, 3 prongs)50 amp (14-50, 4 prongs)20 amp household outlet15 amp household outlet

Running at the same time (typical watts - use the label on your own appliance)

• Roof air conditioner, 13,500 BTU (start-up ~2,700 W)W
• Roof air conditioner, 15,000 BTU (start-up ~3,000 W)W
• MicrowaveW
• Electric water heaterW
• Space heaterW
• Fridge on electricW
• Converter / battery chargerW
• Coffee makerW
• Electric kettleW
• Hair dryerW
• Induction cooktopW
• ToasterW
• TV and streaming boxW
• LED lights and fansW

30 amp vs 50 amp

• 30 amp (TT-30 plug, 3 prongs): one 120-volt line, 3,600 watts in all - usually one air conditioner plus small loads.
• 50 amp (14-50 plug, 4 prongs): two 120-volt lines ("legs") of 50 amps, 6,000 watts each and 12,000 watts in all - enough for two air conditioners and the kitchen.
• Household outlet (15 or 20 amp): 1,800 or 2,400 watts - fine for a battery charger and lights, rarely for an air conditioner.
• Loads that run for hours should stay under 80% of the rating. An air conditioner needs a short extra surge when it starts.
• Campground listings say whether a site has electric hookups; the amperage per site is on the campground's reservation page.

The watts shown are typical values; the label on your own appliance is what counts. Use the right adapter and a surge protector, and never plug a 50 amp rig into a dryer outlet.