Grammi in Calorie
Converti grammi in calorie per proteine, carboidrati, grassi, alcol ed etichette nutrizionali.
*Fattori di conversione energetica secondo FDA 21 CFR 101.9.
Grammi di Macronutrienti in Calorie
Calcola l'energia totale e la distribuzione percentuale dal peso dei nutrienti.
Cos'è la Conversione da Grammi a Calorie?
I grammi misurano la massa fisica mentre le calorie misurano l'energia chimica accumulata.
100 g di Proteine ≠ 100 g di Petto di Pollo
Il primo è puro macronutriente (~400 kcal). Il secondo è cibo contenente ~65% di acqua (~165 kcal).
Visualizzatore della composizione di massa ed energia
Seleziona un alimento campione e regola il cursore del peso per vedere la massa d'acqua rispetto alle calorie effettive.
A. Grammi di nutrienti in calorie
Quando si tratta di macronutrienti isolati (proteine, carboidrati, grassi, alcol), gli scienziati applicano i fattori generali standard Atwater (4, 4, 9 e 7 kcal/g). Questa è l'aritmetica utilizzata per determinare quanta energia deriva dall'assunzione pura di macronutrienti.
B. Peso del cibo in calorie
Quando si pesa il cibo su una bilancia da cucina (ad esempio, 185 g di riso, 150 g di patate dolci), le calorie dipendono dalla densità energetica del cibo. L'acqua contribuisce con grammi di massa con 0 calorie, alterando drasticamente il rapporto calorie per grammo.
Come Usare il Calcolatore da Grammi a Calorie
Scegli la modalità adatta ai tuoi obiettivi nutrizionali o culinari:
1. Calcolo Diretto da Macronutrienti
Input your daily or meal macronutrient peso in grammi for proteine, carboidrati, grassi, and alcol. The engine computes individual and total caloria, displays percentage contributions, and provides optional avanzato subtractions for insoluble fibra and polioli / alcoli dello zucchero.
Ricerca Alimenti Mode
Search over 50+ laboratory-analyzed reference foods (USDA FoodData Central). Enter your bilancia per alimenti measurement in grammi, ounces, pounds, or kilograms to calculate exact caloria, macronutrients, caloria density, and rapid 25g–500g conversions.
Reverse Mode (Caloria to Grams)
Targeting a specific caloric budget or macro allotment? Enter target caloria (e.g. 500 kcal) and select your target macronutrient or benchmark food to determine the exact peso in grammi needed to satisfy your goal.
Ridimensionamento Etichetta
Easily resolve the classic dilemma: "The nutrition facts panel lists caloria for a 30g serving, but I weighed out 75g." Enter printed caloria per serving, nominal dimensione della porzione, and actual peso to scale your exact intake instantly.
Verifica Etichetta (Macro Audit)
Verify commercial packaging math. Enter the printed caloria and macronutrients; the audit engine calculates 4-4-9 theoretical energia, computes percentage discrepancy, and explains variance based on FDA 21 CFR 101.9 rounding rules.
Switch between Standard 4-4-9 general factors and Avanzato Mode inside the calculator to fine-tune soluble/insoluble fibra and polyols.
La Formula da Grammi a Calorie
Standardizzata da Wilbur Atwater e conforme a FDA 21 CFR 101.9:
How Many Caloria Are in 1 Grammo of Proteine?
Proteins yield 4.0 kcal per gram of metabolizable energia. While crudo proteine contains ~5.65 kcal/g in laboratory bomb calorimetry combustion, human physiology cannot oxidize nitrogen, excreting it as urea and yielding 4 kcal/g.
How Many Caloria Are in 1 Grammo of Carbohydrate?
Digestible sugars and starches provide 4.0 kcal per gram. Insoluble plant cellulose passes through unabsorbed (0 kcal/g), while fermentable soluble fibers yield ~2 kcal/g via gut microbial fermentation into short-chain Grassity acids.
How Many Caloria Are in 1 Grammo of Grassi?
Dietary lipids (triglycerides) are dense hydrocarbon chains containing minimal oxygen, releasing 9.0 kcal per gram during cellular oxidation—over 2.25 times the energia density of carboidrati or proteins.
How Many Caloria Are in 1 Grammo of Alcol?
Pure ethanol provides 7.0 kcal per gram. Alcol is processed almost exclusively by hepatic alcol dehydrogenase enzymes and contains zero essential micro- or macro-nutrients.
Simulatore della Formula 4-4-9
Adjust the macronutrient sliders or click a pReimposta to see the mathematical Formula calculate in real time.
Cos'è la Regola 4-4-9?
La regola 4-4-9 (proteine: 4, carboidrati: 4, grassi: 9 kcal/g) è lo standard mondiale per l'energia degli alimenti.
4 Caloria per Grammo of Proteine
When burned in a bomb calorimeter, 1g of proteine releases ~5.65 kcal. However, human cellular respiration cannot oxidize nitrogenous amino groups into energia. The liver converts nitrogen into urea for urinary excretion, carrying away ~1.25 kcal/g. With a 92% digestive absorption coefficient, net metabolizable yield is exactly 4.0 kcal/g.
4 Caloria per Grammo of Carboidrati
Standard monosaccharides and starches oxidize completely into carbon dioxide and water with ~98% digestive efficiency, producing 4.0 kcal/g of net available cellular energia (adenosine triphosphate or ATP).
9 Caloria per Grammo of Grassi
Dietary triglycerides possess long hydrocarbon chains with very few bonded oxygen atoms. Because lipids are highly chemically reduced, cellular oxidation yields 9.0 kcal/g (with 95% digestive absorption), making fats the body\'s primary high-density energia storage medium.
Why Alcol Is Often Shown as 7 Caloria per Grammo
Pure ethanol (C2H5OH) contains 7.0 kcal/g. Although not essential for human survival, alcol is rapidly absorbed in the stomach and small intestine and metabolized ahead of grassi and glucose, suppressing lipid oxidation.
Atwater Energia Loss & Digestion Funnel
Click any nutrient to trace its energia loss from laboratory bomb combustion down to cellular ATP.
Why These Are General Factors (Atwater Specific Factors)
The 4-4-9 numbers are general average factors designed for mixed omnivorous diets. Atwater also formulated specific energy factors for individual food categories based on fiber and protein digestibility:
Under FDA 21 CFR 101.9, food manufacturers are legally permitted to use either general 4-4-9 factors or Atwater specific factors, explaining minor variances on nutrition labels.
Calorie in 100 Grammi di Cibi Comuni
Profili verificati per porzioni da 100g (USDA FoodData Central).
| Alimento | Preparazione | Calorie (100g) | Proteine | Carboidrati | Grassi | Densità |
|---|---|---|---|---|---|---|
| Chicken Breast | Cooked, skinless, roasted | 165 kcal | 31.0g | 0.0g | 3.6g | Medium |
| Chicken Breast | Raw, boneless/skinless | 120 kcal | 22.5g | 0.0g | 2.6g | Low |
| Atlantic Salmon | Cooked, baked/broiled | 206 kcal | 22.1g | 0.0g | 12.3g | Medium |
| Ground Beef (90% Lean) | Cooked, broiled | 217 kcal | 26.1g | 0.0g | 11.8g | Medium |
| Ground Beef (85% Lean) | Cooked, pan-browned | 250 kcal | 25.0g | 0.0g | 16.0g | Medium |
| Tuna (Skipjack) | Canned in water, drained | 116 kcal | 25.5g | 0.0g | 0.8g | Low |
| Whole Egg | Hard-boiled / cooked | 155 kcal | 12.6g | 1.1g | 10.6g | Medium |
| Egg Whites | Cooked or raw | 52 kcal | 10.9g | 0.7g | 0.2g | Very Low |
| Tofu (Firm) | Prepared with calcium sulfate | 76 kcal | 8.1g | 1.9g | 4.8g | Low |
| Whey Protein Powder | Isolate dry powder | 370 kcal | 82.0g | 4.0g | 2.0g | High |
| White Rice (Long Grain) | Cooked, steamed | 130 kcal | 2.7g | 28.2g | 0.3g | Medium |
| White Rice (Long Grain) | Raw, dry grain | 365 kcal | 7.1g | 80.0g | 0.7g | High |
| Brown Rice | Cooked, steamed | 123 kcal | 2.7g | 25.6g | 1.0g | Medium |
| Rolled Oats | Raw dry rolled oats | 389 kcal | 16.9g | 66.3g | 6.9g | High |
| Spaghetti / Pasta | Cooked, al dente | 158 kcal | 5.8g | 30.9g | 0.9g | Medium |
| Spaghetti / Pasta | Dry, unenriched | 371 kcal | 13.0g | 74.7g | 1.5g | High |
| Russet Potato | Baked with skin | 93 kcal | 2.5g | 21.2g | 0.1g | Low |
| Russet Potato | Raw, flesh & skin | 77 kcal | 2.0g | 17.5g | 0.1g | Low |
| Sweet Potato | Baked in skin | 90 kcal | 2.0g | 20.7g | 0.1g | Low |
| Whole Wheat Bread | Commercially prepared | 247 kcal | 13.0g | 41.0g | 3.4g | Medium |
| Black Beans | Cooked, boiled without salt | 132 kcal | 8.9g | 23.7g | 0.5g | Medium |
| Banana | Raw, ripe peeled | 89 kcal | 1.1g | 22.8g | 0.3g | Low |
| Apple (Gala/Fuji) | Raw, with skin | 52 kcal | 0.3g | 13.8g | 0.2g | Low |
| Blueberries | Raw, fresh | 57 kcal | 0.7g | 14.5g | 0.3g | Low |
| Strawberries | Raw, fresh | 32 kcal | 0.7g | 7.7g | 0.3g | Very Low |
| Watermelon | Raw, diced flesh | 30 kcal | 0.6g | 7.6g | 0.2g | Very Low |
| Avocado (Haas) | Raw, flesh only | 160 kcal | 2.0g | 8.5g | 14.7g | Medium |
| Broccoli | Raw, florets & stems | 34 kcal | 2.8g | 6.6g | 0.4g | Very Low |
| Broccoli | Cooked, boiled/steamed | 35 kcal | 2.4g | 7.2g | 0.4g | Very Low |
| Zucchini | Raw, with skin | 17 kcal | 1.2g | 3.1g | 0.3g | Very Low |
| Spinach | Raw baby spinach leaves | 23 kcal | 2.9g | 3.6g | 0.4g | Very Low |
| Cucumber | Raw, with peel | 15 kcal | 0.7g | 3.6g | 0.1g | Very Low |
| Red Tomato | Raw, ripe year-round | 18 kcal | 0.9g | 3.9g | 0.2g | Very Low |
| Carrots | Raw, mature | 41 kcal | 0.9g | 9.6g | 0.2g | Very Low |
| Greek Yogurt (0% Fat) | Plain, nonfat strained | 59 kcal | 10.2g | 3.6g | 0.4g | Very Low |
| Greek Yogurt (Whole Milk) | Plain, 4% milkfat | 97 kcal | 9.0g | 3.9g | 5.0g | Low |
| Cheddar Cheese | Natural block cheese | 403 kcal | 24.9g | 1.3g | 33.1g | Very High |
| Extra Virgin Olive Oil | Pure cold-pressed oil | 884 kcal | 0.0g | 0.0g | 100.0g | Extreme |
| Butter | Unsalted dairy butter | 717 kcal | 0.9g | 0.1g | 81.1g | Extreme |
| Peanut Butter | Smooth, with salt | 588 kcal | 25.1g | 20.0g | 50.4g | Very High |
| Almonds | Raw, unblanched | 579 kcal | 21.2g | 21.6g | 49.9g | Very High |
| Walnuts | Raw, English walnut halves | 654 kcal | 15.2g | 13.7g | 65.2g | Extreme |
| White Granulated Sugar | Pure sucrose | 387 kcal | 0.0g | 100.0g | 0.0g | High |
| Pure Honey | Commercial liquid | 304 kcal | 0.3g | 82.4g | 0.0g | High |
*Data sourced directly from USDA FoodData Central (Foundation Foods & SR Legacy analytical series).
Search exact portions in Food Mode →Tabella di Conversione da Grammi a Calorie
Tabelle rapide per proteine (4 kcal/g), carboidrati (4 kcal/g), grassi (9 kcal/g) e alcol (7 kcal/g).
Multi-Macro Energia Yield at Exact Peso
Drag the slider or click a common porzione peso to compare caloria across all 4 macronutrients simultaneously.
Proteine (4 kcal/g)
Proteine alimentari: 4,0 kcal per grammo.
Carboidrati (4 kcal/g)
Amidi e zuccheri digeribili: 4,0 kcal per grammo.
Grassi (9 kcal/g)
Grassi alimentari puri: 9,0 kcal per grammo.
Alcol (Etanolo) (7 kcal/g)
Pure ethanol energia yield: 7.0 kcal per gram.
Quanti Grammi Sono X Calorie?
Calcola il peso esatto in grammi per raggiungere il tuo target calorico.
Reverse Caloria-to-Grammo Peso Visualizer
Inserisci qualsiasi budget calorico per vedere immediatamente quanti grammi rappresentano tra nutrienti e cibi reali.
100 kcal in grammi
100 kcal200 kcal in grammi
200 kcal300 kcal in grammi
300 kcal500 kcal in grammi
500 kcal1,000 kcal in grammi
1,000 kcal3,000 kcal in grammi
3,000 kcalCalcolo Avanzato da Grammi a Calorie
Come fibre e polioli modificano le equazioni 4-4-9.
Soluble vs. Insoluble Fibra Alimentare
Not all carbohydrate grammi are metabolized equally:
- Insoluble Fibra (0.0 kcal/g): Le fibre insolubili attraversano il tratto gastrointestinale senza apportare calorie.
- Soluble Fibra (~1.5–2.0 kcal/g): Pectins, beta-glucans, and gums undergo colonic anaerobic fermentation by gut microbiota into short-chain Grassity acids (acetate, propionate, butyrate) that are absorbed and oxidized.
Polioli / Alcoli dello Zucchero (Polyols) Energia Factors
Polyols are hydrogenated carboidrati with altered intestinal absorption and low glycemic index:
Net Carboidrati & Polyol Energia Impact Simulator
Test how fibra fermentation and different sugar alcol types alter actual metabolizable caloria.
Total Carboidrati − Fibra − (0.5 × Polyols)
Starches (72) + Fermented Fibra (12) + Polyol (2)
Total Carboidrati × 4
Perché le Etichette Differiscono dal Calcolo dei Macro?
Spiegazioni su arrotondamenti di legge e composizione biochimica.
Simulatore di Discrepanze e Arrotondamenti
Inserisci i dati della confezione per verificare la conformità dell'arrotondamento.
Mandatory Caloria Rounding Thresholds
Federal regulations mandate that manufacturers round printed caloria counts:
Tolleranze Ufficiali di Arrotondamento
Proteine, carbohydrate, and grassi gram figures are also rounded to standardized increments:
How to Handle Variaziones in Your Tracking App
A cumulative discrepancy of 5% to 10% between printed caloria and 4-4-9 arithmetic is entirely typical across commercial foods. If precision is critical for your dietary goal, track crudo macronutrient grammi rather than rounded nominal totals.
Cibi Crudi vs Cotti: Peso e Calorie
L'assorbimento e l'evaporazione dell'acqua cambiano la densità calorica per 100g.
Acqua Shift & Cooking Scale Visualizer
Based on 100g of dry raw rice at 3.65 kcal/g.
Absorbs ~200g of water (hydration factor 3.0x).
If you cooked 100g dry rice into 300g and logged 300g using the raw entry, you would overcount by 730 kcal!
Crudo Rice vs. Cotto Rice
Absorbs 3x Acqua100g of dry rice absorbs ~200g of water during boiling, yielding ~300g of cotto rice. The caloria per gram drop by nearly 65%.
Crudo Pasta vs. Cotto Pasta
Absorbs 2.5x AcquaDurum wheat semolina absorbs Acqua during boiling, expanding and diluting caloric concentration per 100g on your scale.
Crudo Chicken vs. Cotto Chicken
Loses ~25% AcquaPan-searing or roasting evaporates water from muscle tissue, concentrating proteine and caloria per 100g porzione.
Dry Beans vs. Cotto Beans
Espande il peso di 2,8xLegumes absorb large amounts of water during soaking and simmering, lowering caloria density by more than 60%.
Crudo vs. Cotto Potatoes
Variazione Drastica di AcquaOven-baking causes slight moisture loss, increasing caloria from 77 to 93 kcal per 100g, while boiling maintains ~87 kcal.
Always log your food according to the exact state in which it was weighed on your bilancia per alimenti. Never log cotto rice using a crudo rice entry.
Grammi e Calorie per Grasso Corporeo e Dimagrimento
Calcola la perdita di tessuto adiposo da un deficit calorico.
Adipose Matrix & Grassi Loss Timeline Calcolatore
A 500 kcal daily deficit is widely recognized as the gold-Standard rate: it mobilizes Tessuto Adiposo while protecting lean muscle mass and minimizing metabolic downregulation.
Dietary Grassi (9 kcal/g) vs. Human Adipose Tissue (~7.7 kcal/g)
Dietary grassi in food (e.g. olive oil) is 100% pure lipid triglyceride, yielding 9.0 kcal/g. In contrast, stored human body grassi (adipose tissue) is a living biological matrix composed of approximately:
Because of this cellular water, 1 gram of stored human body grassi yields approximately 7.7 kcal (0.85 × 9.0 ≈ 7.65 kcal/g).
The 3,500 Caloria Rule (Wishnofsky Heuristic)
One pound equals 453.59 grammi. Multiplying 453.59g by 7.7 kcal/g yields approximately 3,500 kcal per pound of body grassi:
*Note: True long-term peso loss dynamics are non-linear due to adaptive thermogenesis and glycogen/water shifts.
Grammi e Calorie per Obiettivo di Dieta
Ripartizione dei macronutrienti per definizione, massa o mantenimento.
Ripartizione Macro e Grammi per Obiettivo
High protein (2.0–2.4g/kg) combined with moderate carbohydrates preserves skeletal muscle glycogen and lean body mass during an active caloric deficit.
Diete Chetogeniche e Low-Carb
Restrict net carboidrati to 20–50 grammi per day (<200 kcal). Derive 70%–80% of total caloria from healthy dietary fats (9 kcal/g) and maintain moderate proteine to maintain nutritional ketosis.
Peso Loss & Caloria Deficit
Prioritize foods with low caloria density (<1.0 kcal/g) such as vegetables and lean meats. Target 1.6–2.2g of proteine per kg of body peso to preserve lean muscle tissue in a deficit calorico.
Aumento Massa Muscolare & Bulking
Anchor daily intake with 0.8–1.0g proteine per lb body peso (~4 kcal/g). Allocate surplus energia (250–500 kcal) primarily toward carboidrati to fuel muscular glycogen storage and recovery.
Alcol & Drinking Caloria
Alcol delivers 7 kcal per gram without appearing on macronutrient panels. When drinking, log pure ethanol grammi × 7 and reduce grassi or carbohydrate grammi to maintain your caloric budget.
Errori Comuni nella Conversione da Grammi a Calorie
Evita questi 10 errori comuni quando pesi il cibo sulla bilancia.
"Porzione Blindspot" & Deficit Wipeout Simulator
Free-pouring oil into a skillet feels like a quick splash, but easily adds 24–28g of pure fat (9 kcal/g).
Assuming 100g of food = 100 calories
100g of cucumber contains 15 calories, while 100g of peanut butter contains 588 calories. Calorie density varies by nearly 40-fold across different whole foods.
Confusing food mass with nutrient mass
Weighing 150g of chicken breast does NOT provide 150g of protein. Whole meat is ~65% water and provides ~46g of actual protein.
Logging cooked food using raw entries
Using raw rice calories (365 kcal/100g) for cooked rice (130 kcal/100g) overestimates your meal calories by almost 300% due to absorbed water.
Forgetting alcohol calories (7 kcal/g)
Pure alcohol yields 7 kcal per gram, but is omitted from standard protein, carbohydrate, and fat counts on bar and restaurant menus.
Assuming all grams convert at the same rate
There is no universal grams-to-calories number. Protein and carbs yield 4 kcal/g, fat yields 9 kcal/g, and alcohol yields 7 kcal/g.
Expecting label calories to match exact 4-4-9 arithmetic
Under FDA 21 CFR 101.9, food companies legally round calories and macros to 5- or 10-kcal increments and subtract insoluble fibers.
Confusing dietary calories (kcal) with small calories
Dietary "calories" are actually kilocalories (1,000 small physics calories). 1 kcal is the energy required to heat 1 kilogram of water by 1°C.
Ignoring sugar alcohol and fiber differences
Not all polyols are non-caloric. Erythritol is ~0.2 kcal/g, but maltitol and xylitol yield 2.1–2.4 kcal/g and should be tracked accordingly.
Overlooking nominal package serving weights
Manufacturers frequently list a "serving size" as 28g (~1 oz), but actual packaged portions often contain 35g to 45g.
Using imprecise generic database entries
Boneless skinless chicken breast, roasted chicken thigh with skin, and fried chicken wings have radically different calorie profiles.
Guida alle Calorie per Categoria di Alimenti
Valori nutrizionali e calorie per gruppi alimentari.
Caloria Density & Plate Volume Spectrum
Watch how physical food mass on your scale changes across categories for the exact same 400 kcal energy budget:
Your stomach senses physical volume rather than crudo caloria. Eating low-caloria density foods fills the stomach with water and fibra, triggering vagal nerve mechanoreceptors that send powerful fullness signals to your hypothalamus.
Poultry & Lean Meats
High-protein, zero-carb whole foods with density dictated by fat and moisture.
Grains & Complex Starches
Carbohydrate-dense energy staples with massive water-absorption shifts during cooking.
Fresh Fruits
Naturally sweet, water-rich carbohydrate sources offering dietary fiber and potassium.
Tubers & Vegetables
High-volume, micronutrient-dense staples with low to very low caloric density.
Dairy & Eggs
Complete amino acid sources with flexible fat-to-protein ratios.
Nuts, Seeds & Pure Fats
Extreme calorie-density lipids providing sustained satiety and fat-soluble vitamins.
Domande Frequenti
Risposte scientifiche alle domande più frequenti su grammi e calorie.
Metodologia e Fonti Scientifiche
Database USDA FoodData Central
Database nutrizionale ufficiale del Dipartimento dell'Agricoltura degli Stati Uniti.
Rapporto Congiunto del Comitato FAO/OMS
Energia factors, mandatory rounding thresholds, and etichetta nutrizionale audit rules strictly mirror current U.S. Food and Drug Administration title 21 regulations.
NIH / AtAcqua Reference
Standard metabolizable energia coefficients are corroborated by National Institutes of Health physiological guidelines and FAO nutrient assessment standards.