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Hardtack Calories

Shelf-stable, dry sailor's biscuit

CALORIES · 100 G

371kcal

GI

70high

POTASSIUM · 100 G

130mg

FIBER · 100 G

3.1g

Quick answer

2 piece (medium) of Hardtack (56 g) has 208 calories. That works out to 371 calories per 100 g. It contains 43.5 g of carbs, 6.3 g of protein, 0.8 g of fat and 1.7 g of fiber. Its 17.4 µg of Selenium covers 32% of the Daily Value. Its glycemic index is 70 (high), so it raises blood sugar quickly.

Hardtack Nutrition Facts

Selected: 2 piece (medium) · 56 g

208

KCAL / 56G

Carbs

43.5g

· 16% DV

Protein

6.3g

· 13% DV

Fat

0.8g

· 1% DV

Fiber

1.7g

· 6% DV

DV is the share of the daily value covered, on a 2,000 kcal reference diet.

Calories come from: Carbs 84% · Protein 12% · Fat 4%

Hardtack nutrition facts table · 2 piece (medium) (56 g)

NutrientAmount% DV
Calories208 kcal
Total fat0.8 g1%
Saturated fat0.16 g1%
Trans fat0 g
Sodium364 mg16%
Total carbohydrate43.5 g16%
Fiber1.7 g6%
Protein6.3 g13%

Calories: Calories measure energy. Average daily need is 2,000 kcal. Excess calories are stored as fat, too few cause weight loss.

Carbs: Your body's primary energy source. The brain runs exclusively on carbs. Daily need: 275g.

Protein: Essential for muscle repair and cell growth. Daily need: 50g. Keeps you full and boosts metabolism.

Fat: Needed for hormone production and vitamin absorption. Daily need: 78g. Limit saturated fats, choose unsaturated.

Fiber: Critical for digestive health and satiety. Daily need: 28g. Stabilizes blood sugar, lowers cholesterol.

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How Many Calories in 2 Pieces of Hardtack?

ServingAmountCalories
2 piece (medium)56 g208 kcal
1 piece (small)28 g104 kcal
1 serving (medium)56 g208 kcal
3 piece (large)84 g312 kcal
1 serving (large)84 g312 kcal
100 g100 g371 kcal
1 pack (medium)100 g371 kcal
4 piece (extra large)112 g416 kcal

Calculated from 371 calories per 100 g.

Frequently Asked Questions About Hardtack

What is hardtack?

Hardtack is a very dry, hard biscuit traditionally made from flour and water, sometimes with salt. Its low moisture content helped it keep during long voyages when fresh bread was unavailable.

What is hardtack made of?

Traditional hardtack is made from flour and water, with salt sometimes added. The dough is baked and dried thoroughly, producing a plain, dense biscuit rather than a soft loaf.

How long does hardtack last?

Properly dried hardtack can keep for a long time if it stays dry and is stored in an airtight container. Moisture can lead to mold, so discard it if it becomes damp or develops an unusual smell.

How do you eat hardtack?

You can eat hardtack plain, but it is often easier to chew after soaking it in soup, coffee, or another liquid. Breaking it into small pieces first also makes it easier to handle.

How do you soften hardtack?

Soak hardtack briefly in a drink or soup to soften it. For a warm meal, add pieces to broth and let them sit until they are easier to bite; leaving them too long can make them fall apart.

Why was hardtack used on ships?

Hardtack was useful on ships because it was dry, compact, and less likely to spoil quickly than fresh bread. Sailors could carry it on long voyages and soften it in liquid before eating.

Why is hardtack so hard?

Hardtack is baked and dried to remove most of its moisture, which helps it keep but makes it tough to bite. Its firmness is a feature of the traditional recipe, not a sign that it is stale.

Can you make hardtack at home?

Yes. Mix flour with enough water to form a firm dough, add salt if desired, shape it into flat pieces, and bake until thoroughly dry. Cool it completely before storing it in an airtight container.

Is hardtack the same as a cracker?

No. Hardtack is generally much thicker, drier, and harder than an ordinary cracker, and traditional recipes use very few ingredients. Crackers are usually made to be crisp and ready to eat without soaking.

Why did sailors dip hardtack in coffee?

Sailors dipped hardtack in coffee to make the dry biscuit softer and easier to chew. The liquid also made a plain ration more practical to eat during a voyage.

Hardtack Vitamins & Minerals

Vitamins

B1

0.24mg · 20% DV

B3

2.74mg · 17% DV

Folate

66.08µg · 17% DV

B2

0.13mg · 10% DV

Minerals

Selenium

17µg · 31% DV

Manganese

0.4mg · 17% DV

Sodium

364mg · 16% DV

Iron

2.58mg · 14% DV

Potassium ⭐

73mg · 2% DV

Hardtack Glycemic Index

GLYCEMIC INDEX

70
High
0 Low5570100

GLYCEMIC LOAD

15.1
Medium

Accounts for portion size — a more realistic measure than GI alone.

How to Burn Off Hardtack

To burn the 208 calories in 2 piece (medium) (56 g):

🚶

51min

Walking (5 km/h)

🏃

21min

Running (8 km/h)

🚴

28min

Cycling

🏊

24min

Swimming

Times are calculated with the MET equation for a 70 kg adult. Actual burn varies with your weight, age and pace.

What is Hardtack?

Hardtack is a firm, very dry biscuit made mainly from flour and water, baked to keep well without the softness of fresh bread. It is best known as a practical ship’s biscuit, carried on long voyages because it is compact and shelf-stable.

Its hard, crisp texture makes it easy to pack, though it can be tough to bite. It may be eaten plain or softened in soup, stew or a hot drink; in places where it is less familiar, it also works as a simple base for cheese or other toppings. Hardtack is mostly carbohydrate, with little fat. If you prefer a softer bite, let it soak briefly before eating.

How Nutritious Is Hardtack?

Nutrient density

Low

22/ 100

How many vitamins, minerals and how much fiber this food carries per calorie. A high score means a lot of nutrition for few calories.

Satiety score

Medium

35/ 100

An EatBetter score computed from fiber, protein and calorie density. A high score means staying full longer on the same calories.

Both scores are calculated per 100 g and do not change with the selected portion. The satiety score is EatBetter's own calculation, not a clinical measure.

Is Hardtack Processed?

NOVA 3

Processed

1. Unprocessed

2. Minimally Processed

3. Processed

4. Ultra-Processed

NOVA classifies foods into 4 groups by industrial processing. NOVA 1 (unprocessed) is the healthiest.

Does Hardtack Contain Allergens?

Contains these allergens:

Gluten yes
Dairy free
Eggs free
Peanuts free
Tree nuts free
Fish free
Soy free
Sesame free

Which Diets Is Hardtack Good For?

Vegan

✓ Suitable

Vegetarian

✓ Suitable

Gluten-Free

— Not suitable

Dairy-Free

— Not suitable

Mediterranean

✓ Suitable

Paleo

— Not suitable

Whole30

— Not suitable

DASH

— Not suitable

Keto

— Not suitable

Low FODMAP

— Not suitable

Hardtack Fat Profile

SATURATED

0.16g

MONOUNSATURATED

0.11g

POLYUNSATURATED

0.29g

⚖️

Omega 6:3 ratio 13.5:1

Above the ideal 4:1 (13.5:1).

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Nutrition data compiled from USDA FoodData Central and scientific sources.