Advanced options
Times assume a large (~300g) baking potato: Maris Piper and King Edward fluff best. Done = 98C in the centre or a skewer meeting no resistance. The energy-saving trick that works: microwave most of the way, then 15-20 mins in a hot oven for real skin. Never foil-wrap in the oven: it steams the crisp away.
What The Jacket Potato Calculator Works Out
- Cooking time: a large 300g baker takes 1 hour 15 minutes at 200C (180C fan) in the oven, the same for one potato or a shelf full; 45 to 55 minutes at 200C in an air fryer, in batches if they will not sit in one layer; or 8 to 10 minutes per potato in the microwave followed by 15 to 20 minutes at 220C for real skin. Done is 98C in the centre or a skewer meeting no resistance.
- Prep: scrub, dry, prick all over, rub with oil and flaky salt, and bake straight on the shelf for all-round air. Choose large floury varieties: Maris Piper, King Edward or anything sold as a baker. Never foil-wrap in the oven; it steams the crisp away.
- Toppings for the table: about 50g of grated cheese per potato or half a 400g tin of beans each, with butter in quantities more than feel responsible. Beans and cheese is the eternal ticket; the whole assembly lands under a pound of potato and pennies of energy.
- Potato size (advanced): small 200g potatoes come out about 15 minutes sooner in the oven and need less microwave time; 400g monsters need 15 minutes more. Times move with size, not with how many are in.
- Your oven (advanced): the setting translated for fan (180C, or 200C for the final crisp) and gas (mark 6 or 7), with the preheat allowance.
- Into the oven at (advanced): enter a serving time and the calculator counts back through the method's total time and the preheat, so dinner at 7pm means the oven on at about 5:30pm.
- Electricity for this method (advanced): kilowatt-hours at the current Ofgem price cap unit rate: an oven averaging 1.5kW for 87 minutes including preheat is about 2.2 kWh (around 55p), an air fryer about 1.4 kWh, and the microwave-then-crisp hybrid less still for one or two potatoes. The oven's one economy is parallelism: a shelf of potatoes costs the same as one.
- Chosen topping (advanced): a shopping list for cheese and beans, tuna mayo, chilli or coleslaw scaled to the number of potatoes, in tins, blocks and tubs.
- Potatoes to buy (advanced): the total weight at your size, plus extras to batch-bake, cool, fridge and reheat for 10 minutes at 200C, feeding a week of lunches from a single heating of the oven. Skin on, the potato brings potassium, fibre and slow carbohydrate under whatever the topping decides.