Identify the cooking method first
Write down whether the original recipe is for a conventional oven, a fan oven or a particular air fryer. Keep its original temperature and time together. A unit conversion from Celsius to Fahrenheit does not adapt the recipe to a new appliance.
Also identify the programme on your machine. An appliance with several cooking modes may have different instructions for each. Its model number is more useful than the brand name alone when finding the appropriate manual.
Use a relevant tested recipe
Look for a recipe or cooking chart supplied for your model and a comparable food. Check the food form, portion size and whether the instructions assume frozen or thawed ingredients. Those details belong with the temperature and time.
An online tool that asks only for oven temperature and minutes is missing this context. Treat a general adjustment as a starting suggestion only when its source and limitations are clear, never as proof that the finished dish will be suitable.
Keep a short record of the change
For a recipe you adapt regularly, note the model, programme, quantity and arrangement you actually used. Keep the original recipe beside your notes so it is clear which details have changed.
If the result does not match the recipe, change one relevant variable at a time and use the appliance instructions to guide your next attempt. The record is more useful than a blanket percentage applied to every food.
What this site can calculate
The oven-temperature tool converts Celsius and Fahrenheit. The recipe scaler changes numeric ingredient quantities. Neither tool claims to calculate an air-fryer cooking time.
For programme settings, suitable accessories and food-specific cooking instructions, consult the manufacturer’s information for the exact appliance. A cooking conversion site can keep units clear while leaving model-dependent decisions with the relevant instructions.