Updated 19 July 2026 · Written by Daniel Wright
To adjust cooking time for a different microwave wattage, multiply the stated time by the recipe wattage divided by your wattage. A lower-wattage microwave needs more time, a higher-wattage one needs less. For example, a 1000-watt time run in a 700-watt microwave needs about 1.4 times as long.
New time equals recipe time multiplied by recipe wattage divided by your wattage. Lower wattage means longer cooking; higher wattage means shorter. Check food a little early to avoid overcooking.
How Wattage Affects Cooking Time
Higher wattage cooks faster
A 1100 or 1200-watt microwave delivers more energy, so food heats faster and needs less time than the recipe’s stated wattage.
Lower wattage cooks slower
A 700 or 800-watt microwave delivers less energy, so the same food needs noticeably more time to reach the same result.
The simple formula
New time equals recipe time times recipe wattage divided by your wattage. Find your wattage on a label inside the door or on the back of the unit.
Time Conversion for a 5-Minute 1000W Recipe
| Your microwave wattage | Approximate time |
|---|---|
| 700 W | 7 minutes |
| 800 W | 6 minutes 15 seconds |
| 900 W | 5 minutes 35 seconds |
| 1000 W | 5 minutes |
| 1100 W | 4 minutes 30 seconds |
| 1200 W | 4 minutes 10 seconds |
Common Mistakes to Avoid
- Assuming all microwaves cook at the same speed regardless of wattage.
- Not checking food early, which leads to overcooking on a high-wattage unit.
- Guessing your wattage instead of reading it from the door label.
Frequently Asked Questions
How do I convert microwave cooking time for a different wattage?
Multiply the recipe time by the recipe wattage divided by your wattage. So a 1000-watt, 5-minute dish in a 700-watt microwave needs about 7 minutes.
Where do I find my microwave’s wattage?
Look for a label inside the door frame, on the back of the unit, or in the manual. It is usually listed as output wattage, such as 1000 W.
Does higher wattage always cook better?
Not always, but higher wattage cooks faster and often more evenly. Lower-wattage microwaves simply need more time to achieve the same result.
