How Long to Cook a Sweet Potato in the Microwave (Times by Size)
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A medium sweet potato, around 8 ounces, needs 5 to 8 minutes in the microwave on full power, flipped once halfway through. If you are wondering how long to cook sweet potato in microwave for other sizes, the short answer is roughly 4 minutes for a small one, 8 to 10 minutes for a large one, and 10 to 12 minutes for a very large one over a pound. It is done when a fork slides into the thickest part with no resistance.
The Fast Method, Step by Step
Microwaving is the quickest way to get soft, sweet, spoonable flesh without heating your oven for an hour. The process is simple, and the only real mistakes are skipping the fork holes or guessing at doneness instead of checking.
- Scrub the sweet potato under running water and pat it dry. Leave the skin on, since it holds moisture in and is completely edible.
- Pierce it 6 to 8 times all over with a fork. This lets steam escape so it does not burst.
- Set it on a microwave-safe plate. No wrapping needed, though a damp paper towel over the top helps if your microwave runs dry.
- Microwave on full power for 4 minutes, then flip it with tongs or a towel and continue in 1 to 2 minute bursts.
- Test with a fork or a thin knife at the thickest point. If it glides in, you are done.
- Let it rest for 2 to 3 minutes before splitting it open. The center keeps cooking during that time.
Microwave Times by Sweet Potato Size
Weight matters more than length. A long, skinny sweet potato cooks faster than a short, fat one of the same weight because heat travels a shorter distance to the center. These times assume a 1000 watt microwave on full power.
| Size | Approximate weight | Time on full power | Flip at |
|---|---|---|---|
| Small | 4 to 5 oz | 3 to 4 minutes | 2 minutes |
| Medium | 7 to 9 oz | 5 to 8 minutes | 3 to 4 minutes |
| Large | 10 to 14 oz | 8 to 10 minutes | 5 minutes |
| Extra large | 16 oz and up | 10 to 12 minutes | 6 minutes |
| Two medium at once | 14 to 18 oz total | 9 to 12 minutes | 5 minutes |
| 1-inch cubes, covered | 2 cups | 5 to 7 minutes | stir at 3 minutes |
If your microwave is 700 to 800 watts, add roughly 30 to 40 percent more time. If it is 1200 watts, start checking a minute or two early. Always cook to texture, not to the clock.
Microwave vs. Oven vs. Air Fryer
The microwave wins on speed and loses on skin. Steam is the cooking force here, so the skin stays soft rather than turning papery and crisp. Dry heat methods take longer but build more caramelized flavor as surface sugars concentrate.
| Method | Time for one medium | Skin | Flesh |
|---|---|---|---|
| Microwave | 5 to 8 minutes | Soft, steamed | Moist and loose |
| Oven at 400F | 45 to 55 minutes | Dry and crisp | Fluffy, deeply sweet |
| Air fryer at 380F | 30 to 40 minutes | Crisp and blistered | Fluffy, very sweet |
| Boiling | 20 to 30 minutes | Slippery, usually removed | Wet, best for mashing |
A good compromise is the hybrid approach. Microwave for 4 to 5 minutes to soften the interior, then finish in a 425F oven or air fryer for 10 to 15 minutes for crisp skin. If you prefer the all air fryer route, see our walkthrough on baking a sweet potato in an air fryer.
How Cooking Method Changes Taste and Texture
Sweet potatoes contain starch and an enzyme that converts some of that starch into maltose as the vegetable heats slowly. A microwave races past that window, which is why microwaved sweet potatoes taste a little less candy sweet than oven baked ones. They are still plenty sweet, just cleaner and more vegetal.
Cooking time and method also affect how the starches behave once digested, which is covered in more detail in our post on the sweet potato glycemic index. For a full tour of varieties, storage, and nutrition, our complete sweet potato guide is the place to start. If you are cooking with a specific health or nutrition goal in mind, talk with your doctor or a registered dietitian about what makes sense for you.
Troubleshooting Common Microwave Problems
Hard center, soft ends
This is the most common issue and it means the potato needed more time, not more power. Flip it, add 90 seconds, and let it rest 3 minutes so residual heat finishes the middle.
Dry, leathery patches
Usually caused by hot spots or overcooking. Drape a damp paper towel over the potato and rotate it a quarter turn each time you check.
Exploded or split potato
Not enough fork holes. Steam builds with nowhere to go. Pierce generously next time and you will be fine.
Watery flesh
You steamed it too enthusiastically inside a sealed wrap or covered dish. Cook it uncovered on an open plate instead.
Frequently Asked Questions
Do I need to wrap a sweet potato in plastic or a paper towel?
Neither is required. A damp paper towel helps keep the surface from drying out, but an uncovered potato on an open plate works well and gives you slightly less watery flesh.
Should I poke holes in a sweet potato before microwaving?
Yes. Six to eight fork punctures let steam escape and keep the potato from bursting. It takes ten seconds and prevents a mess.
Can I microwave two sweet potatoes at the same time?
You can. Space them apart on the plate and expect roughly 9 to 12 minutes total for two medium ones, flipping and rotating at the halfway mark. Try to pick potatoes of similar size so they finish together.
Is it better to microwave or bake a sweet potato?
Baking gives crisper skin and deeper sweetness, while the microwave gets you dinner in under 10 minutes. For weeknights, microwave. For a showpiece side, bake. For both, microwave first and finish in a hot oven.
How do I know when a microwaved sweet potato is done?
Slide a fork or thin knife into the thickest part. If it meets no resistance and the potato gives when you squeeze it with a towel, it is ready. Any firmness in the center means another minute or two.
When You Do Not Want to Cook at All
Some days even eight minutes and a fork test is more effort than you have. That is exactly why we make Yammy sweet potato sticks, which are made from real sweet potato and never deep-fried. They are chewy like a fruit leather, with 4g of fiber and 3g of protein per serving, and they are naturally vegan and gluten-free. Our Original, Salt & Pepper, and Sriracha flavors have no added sugar, so the sweetness comes from the sweet potato itself. Keep a bag in your desk drawer for the afternoons when the microwave is too far away.