Set your microwave
Tap the cog, choose your microwave’s cooking output wattage, and save. CookWatt remembers it for next time.
CookWatt support
Different watts.No mental maths.
Quick microwave time conversions, made for your microwave. Find a little help below, or get in touch.
Email supportStart here
A few taps. That’s it.
Check the pack
Swipe the wattage row and tap the power listed in the cooking instructions. Enter the cooking time with the keypad.
See your estimate
Your converted time appears straight away. Change the pack’s time or wattage and the result updates with it.
A little extra help
Common questions
Which wattage should I use for my microwave?
Use the cooking output power, not the electrical input power. Check the label on the door, the appliance’s manual, or the manufacturer’s specifications. In Settings, choose a wattage button or enter a whole number between 100 and 3000 W.
How do I enter minutes and seconds?
The last two digits are seconds. Type 130 for 1 minute 30 seconds, 200 for 2 minutes, or 45 for 45 seconds. Use C to clear the time or backspace to remove the last digit.
How does rounding work?
Open Settings and choose Round up or Round down. For example, a calculated time of 45.6 seconds becomes 46 seconds when rounding up, or 45 seconds when rounding down. Tap Save settings to apply your choice.
Can I change the appearance?
Yes. In Settings, choose Light, Dark, or Follow system, then save. Follow system is the default and follows your iPhone’s appearance. The Home Screen icon’s appearance is controlled separately by iOS.
Does CookWatt need an account or an internet connection?
No account is needed, and cooking-time calculations work offline. Your microwave wattage, rounding choice, and theme preference are saved on your device. See the privacy policy for more detail.
Are converted cooking times guaranteed?
No. CookWatt estimates a cooking time using the ratio between the pack’s wattage and your microwave’s wattage. Food, appliances, containers, and cooking programmes vary. Follow all other cooking instructions, including stirring and standing times, and check that food is piping hot throughout.
Still need a hand?
Let’s sort it out.
Email apps@andydoyle.org for help, feedback, or feature suggestions.
For a problem report, include your iPhone model, iOS version, CookWatt version (at the bottom of Settings), and what happened. Please don’t send passwords or other sensitive information.