How Long to Bake Sweet Potatoes?
Get a size-aware oven estimate below, then verify doneness before serving. How we calculate times.
Calculator
Estimated cooking time
51–59 min
- Oven temp
- 400°F / 200°C
Evidence-informed estimate · Cooking times vary — follow the food-specific completion and food-safety guidance.
- Times assume the food starts refrigerated, not room temperature.
Sweet potatoes by method
At typical settings. Boil is fastest at 29–34 min.
| Method | Typical time | Temp |
|---|---|---|
| Boil | 29–34 min | |
| Oven | 51–59 min | |
| Air fryer | 39–46 min |
How to bake sweet potatoes
Start checking at the early end of the 51–59 min estimate. Appliance output, size and starting state vary, so use the settings above and follow the food-specific completion and safety guidance.
Oven sweet potatoes time by size
| Size | Approximate | Time |
|---|---|---|
| Cubed (3 cm) | For mash or roasting | 30–35 min |
| Medium whole | ≈200 g | 51–59 min |
| Large whole | ≈350 g, for baking | 1 hr 2 min – 1 hr 13 min |
How to know when it's done
Test with the tip of a sharp knife or a fork — it should slide in with little resistance. sweet potatoes keep cooking slightly after they leave the heat, so check a minute early.
Food-level cooking reference: BBC Good Food — How to cook sweet potatoes (checked 2026-08-18). CookCue applies deterministic adjustments; food-safety guidance is sourced separately.
Frequently asked questions
How long does a whole sweet potato take to bake?
60–75 minutes at 200°C for a large one — fork-tender all the way through. Cubes roast in 30–35 minutes.