How Many Calories Are in a Slice of Pizza?
A “slice” is a fraction of a pie, not a unit of mass. One-eighth of a 14-inch regular cheese pizza is about 285 kcal, 12 g protein, 36 g carbohydrate, and 10 g fat on USDA-style rows; pepperoni on the same pie is often ~310 kcal, thin crust drops toward 200–230, and deep dish climbs toward 350–400.
A slice from a 16-inch pie is simply more pizza. Count slices with a diameter and a cut, not with optimism.
Typical 1/8 slices (style and size)
These are ballparks for an eighth of the pie. Six-cut large slices are heavier.
| Pie diameter | Style | Approx. kcal / 1/8 slice |
|---|---|---|
| 12-inch | Regular cheese | ~210 |
| 12-inch | Pepperoni | ~230 |
| 14-inch | Thin cheese | ~210 |
| 14-inch | Regular cheese (USDA-style) | ~285 |
| 14-inch | Regular pepperoni | ~313 |
| 14-inch | Deep dish cheese | ~360 |
| 16-inch | Regular cheese | ~360 |
Stuffed crust, extra cheese, and a side of ranch are not in the table. One ranch cup can add 100–200 kcal. Olive oil on the crust or a garlic-butter dip is the same fat math as a tablespoon of oil (~119 kcal) if that is what was brushed on.
Chain PDFs beat a guess when the shop publishes them — same habit as restaurant estimates. Type diameter and toppings into the pizza calorie calculator when you know the pie and the cut.
Key takeaway: A USDA 14-inch regular cheese eighth is about 285 kcal. “A slice” without diameter is how 210 and 360 get treated as equals.
Diameter, cut count, and the New York fold
Area scales with diameter squared. An eighth of a 16-inch pie is not “a bit more” than an eighth of a 12-inch pie. It is a lot more pizza.
Cut count matters as much as inches. Six slices from a large pie are each bigger than eight slices from the same pie. A personal pan cut into four can look like “two slices” and still be most of a small pie.
Worked example. Two slices of 14-inch regular cheese: ~570 kcal. That can be lunch. Two slices of 16-inch pepperoni plus garlic knots is often 900+ before the drink. People search “how many calories for one slice of pizza” because they want a single number. The honest answer is a range plus the diameter.
Homemade pizza can be lighter if you weigh the dough and cheese — homemade meal calories is the method. Shop pizza is built for pull and browning, which means oil.
If you have a menu description (size, crust, toppings), the restaurant menu analyzer is the draft. Then add dips you used.
Key takeaway: Inches and how many ways the pie was cut decide the piece. The word slice does not.
How pizza gets mis-logged
MyFitnessPal’s first “pizza slice” hit might be a thin personal-pan row. Cronometer is better with a USDA 14-inch cheese item if that is what you ate. MacroFactor will scale grams if you weigh a leftover triangle. Garmin and Apple Health will show a tidy dinner total that is 400 kcal light if you logged a 12-inch eighth and ate a 16-inch third.
| Before | After | What was wrong |
|---|---|---|
| “1 slice pizza,” 200 kcal, twice | Two 14-inch regular cheese eighths | 400 → ~570 kcal |
| Thin-crust row for a fold-over shop slice | Large-diameter, regular crust | 210 → 300–400+ kcal |
| Two slices, no dips | Two slices + ranch cup + garlic knots | +200–400 kcal |
A 72 kg lifter’s Friday log that says “pizza, 600” after four large slices and a soda is not a rounding error. It is a missing pie.
Key takeaway: Match the row to the pie you ordered. Then add the cup of ranch. Trackers cannot see the box.
Two slices, four slices, and the rest of the day
Pizza is bread, cheese, and usually meat. Two measured slices and a salad you actually dressed lightly can fit a day. Four slices plus breadsticks is a different day.
The Dietary Guidelines still count those grains and protein foods. They also count oils. You do not need a punishment workout. You need the log to show the pieces.
A sandwich lunch and pizza dinner is two bread meals. That can be planned. It is messy if both were logged as “something small.”
If you only have a photo of the leftover box, the meal analyzer can draft a split. Then bump oil if the crumb shone.
This is educational food math, not medical advice. Cheese and processed meats are still foods with sodium and fat you may be watching for other reasons. The calorie line is still the slice mass plus the dip.
Key takeaway: Two 14-inch cheese slices ≈ 570 kcal and can be a meal. Four large slices plus extras is most of many people’s day.
How to log a slice without lying
- Note diameter and cut (6 vs 8 vs “I cut it myself”).
- Note cheese vs meat vs deep vs stuffed.
- Add visible oil and dips.
- Do not log a New York fold-over as a thin personal pan.
- Prefer the chain sheet when you have the exact pie.
Pizza is not a moral event. It is energy-dense bread. Two measured slices beat a “I’ll be good tomorrow” rewrite more often than a new diet name.
When you know the size and toppings, run them through the pizza calorie calculator and log that number — then decide whether the next slice is still lunch or already dinner.
Key takeaway: Diameter, cut, and crust first. Then toppings and dips. “Slice” is not a unit until those are named.