How Many Calories Are In A Slice Of Lemon? | Quick Facts

Calories In One Lemon Slice: Quick Math

Food datasets list 29 calories per 100 g of lemon flesh. A common wedge or round weighs about 7 g. Multiply 0.29 kcal × 7 g and you get 2 calories. That’s the standard kitchen answer.

If you trim thinner rounds or cut thicker wheels, the number shifts a hair. The table below gives realistic weights from home prep.

Cut Or Portion	Typical Weight	Calories
Thin Round	4 g	~1 kcal
Standard Wedge (1/8 lemon)	7 g	~2 kcal
Thick Wheel	10 g	~3 kcal
Twist (Peel + A Little Pith)	2 g	~1 kcal
Grated Zest (1 Tsp)	2 g	~1 kcal

That tiny number barely dents your daily calorie needs. In drinks or on a plate, a slice tastes bold yet adds near-zero energy.

Why The Count Can Change

Thickness And Trimming

Knife choice and cut style matter. A paper-thin round lands near 1 calorie. A chunky wheel pushes close to 3. Trimming away seeds and extra pith drops a fraction of a gram.

Peel Versus Flesh

Peel carries oils that pop with aroma. Flesh carries juice, sugar, and vitamin C. A full wedge with juicy flesh nudges the number higher than a peel-forward twist.

Fruit Size And Variety

Small fruit gives smaller slices. Large fruit gives heavier slices. Eureka and Lisbon types track alike for calories; the difference shows more in juice yield and aroma.

Water Loss

A slice that sat out dehydrates a touch. The scale may drop a gram, shaving a fraction of a calorie. Fresh-cut pieces align with the table above.

Lemon Wedge In Real Life: Drinks And Dishes

In a glass of water, that 2-calorie wedge brings fragrance and a light bite. Tea, sparkling water, and iced drinks get the same lift. On food, a wheel on fish, chicken, or grains adds punch with barely any energy cost.

Juice Math You Can Use

One cup of raw lemon juice holds 54 calories. That works out to about 0.22 kcal per gram. A teaspoon of juice (about 5 g) lands near 1 calorie. A tablespoon (15 g) lands near 3 calories. Handy when you’re logging a squeeze over salad or seafood.

You’ll find the baseline numbers in USDA-derived databases for lemon flesh and juice. They report 29 kcal per 100 g of flesh and 54 kcal per cup of juice, with vitamin C listed in detail. These figures line up well for home tracking.

Nutrition Per Slice: Small Calories, Bright Nutrients

A 7 g wedge delivers about 0.7 g carbohydrate, a trace of fiber, water, and roughly 3–4 mg of vitamin C. It’s tiny on energy yet handy for flavor and a touch of nutrients.

Looking at vitamin C across the day? Health agencies outline daily targets around 75–90 mg for adults, with higher needs for smokers. A few slices won’t hit that target, though they help. For exact values and daily targets, see the NIH fact sheet. For full nutrient breakdowns by portion size (including a “1 wedge or slice” entry), check the USDA-based lemon entry.

Acidity And Teeth

Lemon is tart. Frequent sips or sucking on wedges can bother enamel. Sip water after sour drinks, and give your mouth a break between acidic sips.

Buying, Cutting, And Measuring Slices

Pick And Store

Choose firm fruit with a glossy peel. Heavy lemons tend to be juicy. Keep them in the fridge crisper. They hold for a week or two.

Cut Clean Slices

Use a sharp chef’s knife for wheels and a small paring knife for wedges. Trim off stem ends first. For tidy rounds, roll the fruit under your palm to loosen juice, then slice in steady strokes.

Measure Without A Scale

No scale handy? Count cuts. An even “1 lemon into 8” gives classic wedges in the 7 g range. Thin bar-style rounds come from 10–12 slices per fruit; thicker rounds from 6–8 slices.

How A Slice Changes Common Foods

Here’s a quick view of how a wedge or two shows up in a logbook. The calorie line barely moves; the taste change is big.

Use Case	Portion	Added Calories
Water With Lemon	1 wedge (7 g)	~2 kcal
Hot Tea	1 tbsp juice	~3 kcal
Grilled Fish	2 wedges	~4 kcal
Simple Salad	2 tbsp juice	~6 kcal
Baked Chicken	4 rounds on top	~4–6 kcal

Labels, Sources, And Accuracy

Most nutrition tools draw lemon data from government datasets. The standard numbers used here—29 kcal per 100 g of flesh and 54 kcal per cup of juice—trace back to USDA-based lemon entries. For vitamin C targets and general guidance, the NIH fact sheet keeps everything tidy and current.

If you’re tracking fiber across meals, lemons contribute a little. That still helps move you toward the recommended fiber intake, even if a single wedge is small.

Portion Cheatsheet For Fast Logging

Use these set pieces when you want quick entries without pulling out a scale.

Portion	Calories	Notes
1 slice / wedge (7 g)	~2 kcal	Standard cut
2 slices	~4 kcal	Drinks or garnish
1 tsp juice (5 g)	~1 kcal	Light squeeze
1 tbsp juice (15 g)	~3 kcal	Tea or dressing
Half lemon, juice	~6 kcal	About 2 tbsp
1 medium lemon, sections (58 g)	~17 kcal	Fruit without peel

Quick Wrap-Up

A lemon slice is a flavor bomb with a tiny calorie tag—about 2 per standard cut. That makes wedges an easy pick for water, tea, seafood, grains, and salads when you want more taste without moving the needle on energy.

Want structured weight-loss math next? Try our calorie deficit guide for step-by-step planning.