How many calories are in a slice of key lime pie?
A restaurant slice of key lime pie weighs 150 g and carries 483 calories. Per 100 g the pie runs 322 calories, which puts it at the top of the pie case: denser than cherry, denser than berry, denser than a fast-food apple pie. The green filling looks light. The sweetened condensed milk under it is not.
You'd need to walk about 97 minutes to burn the 483 calories in one slice (150 g).
How long does it take to burn off key lime pie?
One slice (150 g) is 483 kcal. Enter your weight and the amount you ate to see how long it takes you to burn that off:
lb
| Activity | Time to burn 483 kcal |
|---|---|
| Walking, brisk | 1 hr 37 min |
| Cycling, moderate | 1 hr |
| Swimming, moderate | 1 hr 9 min |
| Jogging | 57 min |
| Weight training, moderate | 1 hr 47 min |
Times are for a 155 lb adult at a steady pace; change the weight to see yours. The amount is set to the portion in the text (150 g); change it to what you actually ate. BodyPal works this out from your steps automatically.
On this page
- Key lime pie quick facts
- US servings, from one ounce to the whole pie
- Slices, whole pies and store-bought versions
- Saturated fat, not calories, is the row to watch
- How does key lime pie compare to other pies?
- Most popular key lime pie brands
- Key lime pie FAQs
Key lime pie quick facts
The number people need is the one for the plate in front of them, so the base record here is FNDDS 2708001, "Pie, key lime" from the 2021-2023 survey release. It describes a finished pie — citrus custard filling on a graham cracker crust, no whipped cream, no meringue — which is exactly the pie in the photo above and the one that arrives at a diner table.
Branded frozen and bakery pies are separate commercial recipes with their own numbers, and they sit further down the page rather than being blended into this row. Averaging a homemade custard pie with a factory one would produce a figure that matches neither.
| Nutrient | Per 100 g | Per 1 slice (150 g) | % Daily Value |
|---|---|---|---|
| Calories | 322 | 483 | — |
| Total fat | 14.92 g | 22.4 g | 29% |
| Saturated fat | 7.59 g | 11.4 g | 57% |
| Carbohydrate | 42.16 g | 63.2 g | 23% |
| Dietary fiber | 0.3 g | 0.5 g | 2% |
| Total sugars | 35.88 g | 53.8 g | — |
| Protein | 5.78 g | 8.7 g | 17% |
| Sodium | 182 mg | 273 mg | 12% |
% Daily Value is based on a 2,000-calorie diet.
Verified nutrition data
Numbers on this page come from USDA FoodData Central, the U.S. Department of Agriculture’s food composition database, and from manufacturer labels where a branded product is named. Last verified September 2026. How we verify our data →
Two rows you would see on a supermarket label are missing here: added sugars and trans fat. This FNDDS edition does not publish either value for the record, so they are left out rather than guessed at, and total sugars carry no %DV of their own. The same slice also brings 59 mg of cholesterol (20% DV) and 384 mg of potassium (8% DV), the potassium coming mostly from the dairy in the filling. The FDA Daily Value reference is the source for every percentage in the column.
US servings, from one ounce to the whole pie
| Serving | Weight | Calories |
|---|---|---|
| 1 oz | 28 g | 91 kcal |
| One slice, any size | 150 g | 483 kcal |
| 1 cup, cut up | 250 g | 805 kcal |
| One whole pie, any size | 1600 g | 5152 kcal |
| Per 100 g | 100 g | 322 kcal |
The 150 g slice, the 250 g cup and the 1,600 g whole pie are USDA household measures for this record, not our inventions. The ounce is our own arithmetic from the USDA 100 g figure, useful only because bakery counters price by weight.
The cup is the trap. Cut a slice into cubes, press them into a measuring cup, and you have 250 g of pie — 805 calories, or 322 more than the slice you started from. Custard pies compact in a way that a scoop of ice cream does not, and a cup of key lime pie works out to roughly one and two-thirds of a normal restaurant slice. Weigh it once and you will never trust a cup again.
Slices vary more than any other number on this page. A 1,600 g pie cut into eleven gives roughly the 150 g USDA slice at 483 calories; cut into twelve, each piece is about 133 g and roughly 429 calories — our own arithmetic from the 100 g figure, not a USDA serving.
Slices, whole pies and store-bought versions
| Version | Per 100 g | Typical piece | Calories |
|---|---|---|---|
| Key lime pie slice, USDA reference | 322 kcal | 1 slice (150 g) | 483 kcal |
| Whole key lime pie | 322 kcal | 1 pie (1600 g) | 5152 kcal |
| Key lime pie by the ounce | 322 kcal | 1 oz (28 g) | 91 kcal |
| Frozen store slice, Edwards | 359 kcal | 1 slice (92 g) | 330 kcal |
| Mini key lime pie, Hail Merry | 488 kcal | 1 package (43 g) | 210 kcal |
| Bakery key lime pie, Kenny's | 341 kcal | 3 oz (85 g) | 290 kcal |
Here is the counterintuitive part. The Edwards frozen slice is denser than the reference pie — 359 calories per 100 g against 322 — yet a portion costs you less, 330 calories against 483, because the factory cuts a 92 g slice where a restaurant cuts 150 g. Buying the richer pie in a smaller piece wins. Edwards also lists a bigger 1/8-of-a-pie serving at 128 g and 451 calories, which lands right back near a bakery slice.
The single-serve versions push that further in both directions. Hail Merry's 43 g mini pie is the most calorie-dense product on the list at 488 per 100 g, but the package is so small it comes to 210 calories — the lightest branded serving here. Kenny's 3 oz bakery slice sits at 341 per 100 g and 290 calories. Per gram they get richer; per serving they get smaller. Portion size beats recipe every time.
Saturated fat, not calories, is the row to watch
A slice is 483 calories, about a quarter of a 2,000-calorie day. Its saturated fat is 11.4 g, or 57% of the 20 g Daily Value — more than twice as demanding as the calorie share. That is the honest headline for this dessert: the calories are ordinary for a pie, the saturated fat is not. The Dietary Guidelines for Americans advise keeping saturated fat under 10% of daily calories, and one slice uses more than half of that allowance on its own. Butter in the graham crust and the fat in sweetened condensed milk do it, not the limes.
Sugar is the other big number, 53.8 g of total sugars per slice. It cannot be compared against the added-sugars Daily Value, because USDA does not split added from natural sugars for this record — the table shows the total, and that is all the data supports.
Sodium is milder than people expect: 273 mg, 12% DV, about an eighth of a teaspoon of table salt across the whole slice. And protein is genuinely respectable for a dessert at 8.7 g, 17% DV, courtesy of the eggs and condensed milk in the custard. If you are choosing a dessert while watching saturated fat, this is a poor pick; if you are choosing one that will hold you until dinner, it is a surprisingly good one.
How does key lime pie compare to other pies?
| Pie | Per 100 g | Same 150 g slice | Calories |
|---|---|---|---|
| Key lime pie | 322 kcal | 1 slice (150 g), USDA serving | 483 kcal |
| Apple pie, fast food | 316 kcal | 150 g, our arithmetic | 474 kcal |
| Cherry pie | 311 kcal | 150 g, our arithmetic | 467 kcal |
| Berry pie | 306 kcal | 150 g, our arithmetic | 459 kcal |
USDA lists those three pies by piece without a gram weight in this release, so the fair comparison is a matched 150 g slice, scaled by us from each 100 g figure.
Our take: key lime is the heaviest of the four per 100 g, and it is heaviest by almost nothing. Twenty-four calories separate a key lime slice from a berry slice of the same weight — less than one bite. Swapping fruit pie for key lime to save calories is wasted effort; cutting a 100 g slice instead of a 150 g one saves 161, roughly seven times more. Where key lime genuinely differs is composition: nearly double the protein of cherry pie and a much bigger saturated fat load, since its filling is dairy and eggs rather than fruit. For a dessert that fits an ordinary day, MyPlate guidance points the same way this data does — keep the piece small and let the rest of the plate carry the meal.
Most popular key lime pie brands in the United States
Ranked by how widely each product appears among foods sold in the United States, from the BodyPal food database of over 3.3 million products. Calories are the figures printed on each Nutrition Facts label, checked against USDA FoodData Central.
| Product | Calories (per 100 g) |
|---|---|
| Edwards Key Lime Pie | 359 cal |
| Edwards Key Lime Pie (1/8 pie) | 352 cal |
| Hail Merry Key Lime Pie | 488 cal |
| Pie in the Sky Bakery Key Lime Pie | 468 cal |
| Divine Pie Key Lime Pie | 406 cal |
| Kenny's All Natural Key Lime Pie | 341 cal |
Brand popularity: BodyPal food database. Nutrition: manufacturer labels / USDA FoodData Central.
Key lime pie FAQs
How many calories are in a slice of key lime pie?
A 150 g slice is 483 calories, the USDA serving for this record. That slice brings 22.4 g of fat, 11.4 g of it saturated, and 63.2 g of carbohydrate. A smaller diner cut of 100 g lands at 322 calories, so the knife decides more than the recipe does.
How many calories are in a whole key lime pie?
A whole 1,600 g key lime pie is 5,152 calories. That is the USDA weight for a full pie, any size, and it divides into roughly eleven 150 g slices at 483 calories each. Cut twelve slices instead and each one drops to about 429 calories, our own arithmetic, not a USDA serving.
How much sugar is in key lime pie?
A 150 g slice holds 53.8 g of total sugars, scaled from 35.88 g per 100 g. That is the whole sugar figure, natural and added together: USDA does not publish added sugars for this FNDDS record, so the row carries no %DV. Sweetened condensed milk does most of the work.
Is key lime pie healthier than cherry pie?
Barely. Key lime runs 322 calories per 100 g against 311 for USDA's cherry pie, an 11-calorie gap that disappears the moment one slice is cut bigger. Key lime does carry more protein, 5.78 g per 100 g versus 2.95 g, because of the eggs and condensed milk in the filling.
How many calories are in Edwards key lime pie?
One Edwards frozen slice of 92 g is 330 calories, and the brand's 1/8-of-a-pie serving of 128 g is 451. The frozen pie is denser than the USDA reference, 359 calories per 100 g against 322, so the smaller factory slice still costs less than a 150 g bakery cut.
How much saturated fat is in key lime pie?
A 150 g slice carries 11.4 g of saturated fat, 57% of the FDA Daily Value of 20 g. That is the harshest number on this page, since the same slice is only about a quarter of a 2,000-calorie day. Butter in the graham crust and condensed milk in the filling drive it.
Does key lime pie have protein?
More than most desserts: 8.7 g in a 150 g slice, 17% of the Daily Value, from 5.78 g per 100 g. Eggs and sweetened condensed milk in the custard filling do that. It is not a protein food, but it beats cherry pie's 2.95 g per 100 g by roughly double.
What is a standard serving size of key lime pie?
USDA uses 150 g for one slice of key lime pie, any size, and 483 calories with it. A cup of cut-up pie is 250 g and 805 calories, and a whole pie is 1,600 g. Restaurant slices vary widely, so weigh yours once and you will know your own cut.
Similar foods
- Bolillo — 372 cal per medium roll
- Pork Roll — 197 cal for 2 slices
- Spinach Tortilla — 132 cal per tortilla
- Corn Muffin — 345 cal per medium muffin
- Mooncake — 469 cal per large round Moon Cake
- Garlic Bread — 143 cal per slice
Count it without the math
Point the camera at the plate and BodyPal counts the slice for you, crust and filling together.
