Estimate reheating time for leftovers by portion weight and method.
Usage Tip
Add a splash of water and cover to stop leftovers drying out.
How Long to Reheat Food
Reheating is really two questions: which method, and how long. The method matters more than people think – the microwave is fastest but turns crisp food soft, while an oven or air fryer takes longer and brings texture back. Whatever you choose, the destination is the same: 165°F in the center, the USDA-safe temperature for leftovers. The calculator above gives a time and temperature for your food and method, and compares the methods side by side so you can pick.
Reheating Time Chart
| Food | Best method | Time |
|---|---|---|
| Pizza | Air fryer | 3–5 min @ 350°F |
| Chicken | Microwave (fast) / oven (crisp) | 2–4 min / 15–20 min |
| Pasta | Microwave | 2–3 min |
| Rice | Microwave | 1.5–3 min |
| Casserole | Oven | 20–30 min @ 350°F |
| Soup | Stovetop | 5–8 min |
| Steak | Air fryer / low oven | 3–5 min / 10–15 min |
| Seafood | Low oven | 10–15 min @ 275°F |
Microwave Reheating Guide
Fastest, but uneven and tough on texture. Cover loosely to trap steam, add a splash of water to rice and pasta, and stir or rotate halfway through. Use 50–70% power for delicate foods to avoid rubbery edges. Higher-wattage microwaves (1000W+) reheat faster than 700W models, so scale the time down for a stronger oven.
Oven Reheating Guide
The most even method and the best for keeping food crisp. Reheat most leftovers at 325–350°F, cover casseroles and saucy dishes with foil to hold moisture, and uncover anything you want crisp for the last few minutes. It is slower and uses more energy, but a tray of leftovers comes out close to fresh.
Air Fryer Reheating Guide
The air fryer is the sleeper hit of reheating: it brings back crispness faster than an oven and far better than a microwave. Set it to about 350°F, give pieces room for airflow, and check early – small portions reheat in 3–5 minutes. Ideal for pizza, fried foods, roasted vegetables, and anything that should crunch. See the Air Fryer Time Calculator for fresh-cook times.
Reheating Pizza: Methods Compared
The eternal question. Here is how the methods stack up for a slice of cold pizza:
| Method | Time | Result |
|---|---|---|
| Air fryer @ 350°F | 3–5 min | Crispiest, fastest – the winner |
| Skillet (covered) | 3–5 min | Crisp bottom, melty top |
| Oven @ 375°F | 8–10 min | Even and crisp, slower |
| Microwave | 30–60 sec | Fast but soft crust |
For crust, skip the microwave. A skillet on medium with a lid (a few drops of water steam-melts the cheese) or an air fryer gets the closest to fresh.
Leftovers Safety Guide
Reheat all leftovers to an internal 165°F, measured with a food thermometer in the thickest part. Bring soups, sauces, and gravies to a rolling boil. Reheat only once – repeated cooling and reheating both degrades food and raises risk.
| Food | Safe internal temp |
|---|---|
| All leftovers | 165°F |
| Poultry | 165°F |
| Casseroles | 165°F |
| Soups / sauces | Rolling boil |
Food Storage & Reheating
Refrigerate leftovers within two hours of cooking and use within 3–4 days; freeze anything you will not eat by then. Cold food reheats more evenly if you let it sit out briefly first (no more than the two-hour window) and spread it in an even layer. Thick or dense portions need lower heat and more time so the center catches up to the edges.
Frozen Leftovers Guide
Frozen food roughly doubles reheating time. For best results, thaw in the fridge overnight, then reheat as normal. To go straight from frozen, use the microwave defrost setting first or a covered low oven, and always verify 165°F in the center – the outside heating up does not mean the middle has. Soups and stews reheat well from frozen on the stovetop with frequent stirring.
Common Reheating Mistakes
- Microwaving crisp foods (pizza, fried chicken) and wondering why they are soggy.
- Not stirring or rotating – microwaves heat unevenly, leaving cold spots.
- Skipping the thermometer and guessing at 165°F.
- Reheating the same leftovers multiple times.
- Reheating frozen food on high without checking the center.
Frequently Asked Questions
How long to reheat pizza?
3–5 minutes in an air fryer or covered skillet for crisp crust, 8–10 minutes in a 375°F oven, or 30–60 seconds in the microwave if you do not mind a soft crust.
What temperature should leftovers be reheated to?
165°F internal, measured in the thickest part. Soups and sauces should reach a rolling boil.
Is it better to reheat in the microwave or oven?
Microwave for speed and soft foods; oven or air fryer for anything that should stay crisp or heat evenly.
How long to reheat food from frozen?
Roughly double the refrigerated time, or thaw in the fridge first. Always confirm 165°F in the center.
Can I reheat leftovers more than once?
Best not to – reheat only the portion you will eat, and discard what is repeatedly cooled and reheated.
How long are leftovers good for?
3–4 days refrigerated; freeze for longer storage.
Related Cooking Time Calculators
Food safety note: following USDA guidance, reheat leftovers to 165°F internal and soups/sauces to a boil; times vary with microwave wattage, oven calibration, portion size, and food thickness, so treat them as estimates and verify with a thermometer. Refrigerate within two hours and use within 3–4 days. General guidance, not a food-safety guarantee.