Atwater General Factors Reference

Grams to Calories Conversion Chart

Quick reference table comparing caloric yields for protein (4 kcal/g), carbohydrates (4 kcal/g), fat (9 kcal/g), and alcohol (7 kcal/g).

Formula: kcal = grams × factor

Weight (g)	Protein (4 kcal/g)	Carbs (4 kcal/g)	Fat (9 kcal/g)	Alcohol (7 kcal/g)
1 g	4 kcal	4 kcal	9 kcal	7 kcal
2 g	8 kcal	8 kcal	18 kcal	14 kcal
3 g	12 kcal	12 kcal	27 kcal	21 kcal
4 g	16 kcal	16 kcal	36 kcal	28 kcal
5 g	20 kcal	20 kcal	45 kcal	35 kcal
8 g	32 kcal	32 kcal	72 kcal	56 kcal
10 g	40 kcal	40 kcal	90 kcal	70 kcal
15 g	60 kcal	60 kcal	135 kcal	105 kcal
20 g	80 kcal	80 kcal	180 kcal	140 kcal
25 g	100 kcal	100 kcal	225 kcal	175 kcal
28 g	112 kcal	112 kcal	252 kcal	196 kcal
30 g	120 kcal	120 kcal	270 kcal	210 kcal
31 g	124 kcal	124 kcal	279 kcal	217 kcal
32 g	128 kcal	128 kcal	288 kcal	224 kcal
33 g	132 kcal	132 kcal	297 kcal	231 kcal
35 g	140 kcal	140 kcal	315 kcal	245 kcal
36 g	144 kcal	144 kcal	324 kcal	252 kcal
37 g	148 kcal	148 kcal	333 kcal	259 kcal
38 g	152 kcal	152 kcal	342 kcal	266 kcal
40 g	160 kcal	160 kcal	360 kcal	280 kcal
50 g	200 kcal	200 kcal	450 kcal	350 kcal
55 g	220 kcal	220 kcal	495 kcal	385 kcal
60 g	240 kcal	240 kcal	540 kcal	420 kcal
65 g	260 kcal	260 kcal	585 kcal	455 kcal
70 g	280 kcal	280 kcal	630 kcal	490 kcal
75 g	300 kcal	300 kcal	675 kcal	525 kcal
80 g	320 kcal	320 kcal	720 kcal	560 kcal
85 g	340 kcal	340 kcal	765 kcal	595 kcal
90 g	360 kcal	360 kcal	810 kcal	630 kcal
95 g	380 kcal	380 kcal	855 kcal	665 kcal
100 g	400 kcal	400 kcal	900 kcal	700 kcal
125 g	500 kcal	500 kcal	1125 kcal	875 kcal
150 g	600 kcal	600 kcal	1350 kcal	1050 kcal
175 g	700 kcal	700 kcal	1575 kcal	1225 kcal
200 g	800 kcal	800 kcal	1800 kcal	1400 kcal
250 g	1000 kcal	1000 kcal	2250 kcal	1750 kcal
300 g	1200 kcal	1200 kcal	2700 kcal	2100 kcal
350 g	1400 kcal	1400 kcal	3150 kcal	2450 kcal
400 g	1600 kcal	1600 kcal	3600 kcal	2800 kcal
450 g	1800 kcal	1800 kcal	4050 kcal	3150 kcal
500 g	2000 kcal	2000 kcal	4500 kcal	3500 kcal
600 g	2400 kcal	2400 kcal	5400 kcal	4200 kcal
750 g	3000 kcal	3000 kcal	6750 kcal	5250 kcal
800 g	3200 kcal	3200 kcal	7200 kcal	5600 kcal
900 g	3600 kcal	3600 kcal	8100 kcal	6300 kcal
1000 g	4000 kcal	4000 kcal	9000 kcal	7000 kcal
1200 g	4800 kcal	4800 kcal	10800 kcal	8400 kcal
1500 g	6000 kcal	6000 kcal	13500 kcal	10500 kcal
2000 g	8000 kcal	8000 kcal	18000 kcal	14000 kcal

Frequently Asked Questions About Conversion Charts

How do you convert grams to calories? ↓

To convert grams of a pure macronutrient to calories, multiply its weight by its metabolizable energy factor: multiply protein by 4, carbohydrates by 4, dietary fat by 9, and alcohol by 7. For whole foods, multiply the food's weight by its specific calorie density per gram.

How many calories are in 100 grams? ↓

There is no single universal value for 100 grams. 100 grams of pure protein or carbs yields 400 kcal, 100 grams of pure fat yields 900 kcal, and 100 grams of whole food varies widely depending on moisture content (e.g. 100g cucumber is 15 kcal, while 100g olive oil is 884 kcal).

Is 100 grams equal to 100 calories? ↓

No. Grams measure physical mass on a scale, while calories measure biochemical potential energy. They are completely distinct physical units.