30
meals
18,000
kcal
143.6
oz
12.7
cups
30
meals
18,000
kcal
143.6
oz
12.7
cups
Meal prepping — cooking large batches of food in advance for the week — saves time, reduces food waste, supports dietary goals, and cuts grocery costs. The Meal Prep Calculator determines total meals, calories, and approximate bulk quantities of protein and grains based on your household size, meal frequency, and prep duration.
A typical weekly meal prep session (90–120 minutes) can cover 5 days of lunches and dinners for two people. The key is planning meals around versatile base ingredients that can be combined differently each day: grilled chicken works in salads, grain bowls, wraps, and stir-fries; roasted vegetables complement any protein; a large batch of rice or quinoa serves as the foundation for multiple meal styles.
The calculator uses standard macronutrient ratios: approximately 30% of calories from protein, 45% from carbohydrates (grains, vegetables), and 25% from fats. Based on a typical 600-calorie meal, this means roughly 45g of protein, 67g of carbohydrates, and 17g of fat per meal. These are starting points — adjust based on your specific dietary approach (low-carb, high-protein, etc.).
Protein calculation accounts for cooking shrinkage: cooked protein is divided by 0.75 to estimate raw purchase weight (25% cooking loss). Grains volume uses the standard conversion of 1 cup dry = 180g/6.4 oz, yielding approximately 2–3 cups cooked depending on grain type.
Total meals = People × Meals per day × Days. Total calories = Total meals × Calories per meal. Protein oz (raw) = (Total meals × Calories per meal × 30% protein share ÷ 50 kcal/oz cooked) × 1.33 shrinkage factor. Dry grains cups = (Total meals × Calories per meal × 45% carb share ÷ 100 kcal/oz dry) ÷ 6.4 oz/cup.
These quantities are estimates for balanced mixed-macro meals. Adjust protein up if following a high-protein diet. The grains figure assumes about half carb calories come from grains and half from vegetables (vegetables add volume with fewer calories). Use protein_oz to estimate your grocery list for the week.
Inputs
Results
30 meals = 18,000 calories total. About 6.7 lbs of raw protein and 21 cups of dry grains for the week.
Inputs
Results
14 meals for one person over a week. About 3.45 lbs raw protein and 11 cups dry grains needed.
Cooked proteins (chicken, beef, fish): 3–4 days. Cooked grains (rice, pasta, quinoa): 3–5 days. Cooked vegetables: 3–5 days. Raw prepped vegetables (chopped, washed): 3–7 days depending on type. For 7-day prep, freeze days 5–7 portions and thaw as needed.
Chicken breast and thighs reheat well and stay moist. Ground beef and turkey are versatile for bowls, tacos, and pasta. Hard-boiled eggs last a week. Canned tuna and salmon require no cooking. Baked salmon reheats well but should be consumed within 3 days.
Cook rice with extra water (use a 1:2 ratio instead of 1:1.5). Store in airtight containers. Add 1–2 tablespoons of water before reheating in the microwave and cover with a damp paper towel. Rice stored more than 3 days in the fridge benefits from reheating with added moisture.
Breakfast items often differ in prep method — overnight oats, smoothie packs (pre-portioned and frozen), egg muffins, and chia pudding are popular meal prep breakfasts that don't overlap with lunch/dinner prep. Budget 20–30 extra minutes to prep breakfast items separately.
Glass containers (Pyrex, OXO) are durable, microwave-safe, and do not absorb odors. BPA-free plastic containers are lighter and cheaper. Compartment containers (like Bentgo) keep foods separate. For freezer meals, leave 1 inch of headspace for expansion and avoid glass for soups and liquids.
Yes, with caveats. Separate wet and dry ingredients — store dressing and wet toppings (tomatoes, cucumbers) separately from greens and dry toppings. Sturdy greens (kale, romaine) last 4–5 days prepped. Delicate greens (spinach, arugula) last 2–3 days. Mason jar salads with dressing at the bottom stay fresh up to 5 days.
Cook proteins and grains plain or simply seasoned, then vary sauces and toppings daily. Example: plain chicken breast can become Mexican (salsa, cilantro), Mediterranean (tzatziki, olives), Asian (teriyaki sauce, sesame), or American (BBQ sauce) with different condiments. This prevents meal prep boredom.
Fish is safe to meal prep but has a shorter window. Cooked fish lasts 3–4 days in the refrigerator. It is best consumed on days 1–3 after prepping. Freeze portions intended for days 4+ and thaw in the refrigerator overnight. Strongly flavored fish like salmon can make other foods in the refrigerator smell if containers are not airtight.
Studies estimate that batch meal prep saves 2–4 hours per week compared to cooking each meal individually. The savings come from single setup/cleanup, buying in bulk, and parallel cooking (roasting vegetables while cooking grains while searing protein). First-time preppers often overestimate prep time; with practice, a week of meals can be prepped in 60–90 minutes.
Sunday is the most popular choice as it prepares food for the work week. Wednesday can supplement mid-week for fresh variety. The key is picking a day when you have 1.5–2 hours with minimal interruptions. Start with a clear plan: write out your meals and grocery list before you begin cooking.
Roboculator Team
The Roboculator Team explains calculations, planning tools, and practical formulas in clear language for real-life situations.
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