How the meal prep cost calculator works
This calculator multiplies three numbers you control: household size, meals per person per week, and a per-meal cost baseline that depends on the diet style you pick. The result is what your groceries should actually cost if you buy, portion, and cook the meals yourself instead of ordering delivery.
The per-meal baselines come from mid-2020s US grocery price data. They assume you're shopping at a mainstream supermarket (Kroger, Safeway, Publix, HEB), not a premium store like Whole Foods and not a warehouse club like Costco. Bulk shopping typically brings prices down 10–15%; convenience foods like pre-cut vegetables and marinated protein push them up by roughly the same amount.
The four diet-style baselines
- Standard ($3.25/meal): Balanced plate — a palm-size protein, a fist of starch, a fist of vegetables. Mix of chicken, ground turkey, occasional beef, rice, potatoes, pasta, frozen and fresh vegetables.
- High-Protein ($4.10/meal): Lean meats (chicken breast, sirloin, 93/7 ground beef), eggs, Greek yogurt, cottage cheese. Roughly 35–45g protein per meal. Used by readers lifting weights or on a calorie-controlled plan.
- Vegetarian ($2.60/meal): Lentils, chickpeas, black beans, tofu, eggs, cheese, whole grains, hearty vegetables. Lower cost because pulses and grains per pound are significantly cheaper than animal protein.
- Budget ($2.10/meal): Heavy on rice, beans, eggs, oats, frozen vegetables, chicken thighs (cheaper than breast), and whole chickens. The blueprint from the budget meal prep guide.
Methodology
We track grocery prices monthly from a basket of roughly 120 meal-prep staples at three mainstream US supermarket chains, then calculate cost-per-meal based on portion sizes that match the Dietary Guidelines for Americans. The "eating out" benchmark of $14.50 comes from 2025 BLS food-away-from-home data (average combined restaurant + fast food + delivery). Real results vary by city, store, and how much you throw away — the usual culprits for going over budget are unplanned restaurant meals mid-week and produce that spoils before you cook it.
How meal prepping actually saves money
The savings don't come from groceries being cheap. They come from avoiding the 60–80% markup restaurants charge for prepared food. A rotisserie chicken at Costco is $5. The same chicken at a casual restaurant, divided into portions, becomes four $13 plates. Meal prep captures that markup for your household.
Secondary savings come from a place most people underrate: fewer impulse decisions. When dinner is already cooked and in the fridge, you don't open a delivery app at 7pm because you're tired. The average DoorDash order with tip and service fees runs close to $30 for a single person, $45 for two. Cutting two of those a week is $200–300 a month, or $2,500–3,500 a year — without changing what you actually eat.
Realistic savings brackets
- Light switch (2 meals/week replaced): About $1,170/year saved.
- Typical switch (5 meals/week replaced): About $2,925/year saved.
- Heavy switch (10 meals/week replaced): About $5,850/year saved.
- Full switch (15 meals/week replaced): About $8,775/year saved.
Those numbers assume groceries stay constant, which isn't quite right — when you prep more, you spend slightly more at the store. The calculator above nets it out so you see the real delta, not the gross eating-out total.
Getting started without blowing the budget
New meal preppers almost always overspend in week one. The usual reasons: buying specialty ingredients for recipes you'll make once, filling three shopping carts worth of containers before you've cooked anything, and stocking up on "healthy" snacks that aren't on the meal plan. Here's a cheaper first week:
- Pick 2 proteins, 2 carbs, 2 vegetables. Rotate, don't multiply. Your first month of prep should use the same 6 ingredients cooked three different ways.
- Shop Sunday or Monday, cook once. Spreading shopping over multiple days is how convenience items sneak into the cart.
- Use containers you already own. Mason jars, deli containers, even Tupperware lids work. Buying a 12-pack of glass containers is a nice-to-have, not a starter requirement.
- Cook enough for leftovers, not a spreadsheet. Four of the same lunch is fine. Nobody gets bored on a Thursday.
If you want the step-by-step system — weekly menu templates, grocery lists, timing plans for 90-minute Sunday prep sessions — we wrote the meal prep guide and the Meal Prep Masterplan for that.
Cost vs convenience: when eating out still wins
Meal prep saves money. It doesn't always save time. Realistic weekly cost includes about 90 minutes of cooking plus 30 minutes of shopping. That's roughly two hours. If your time is worth more than $30/hour and you're only saving $60 a week, the numbers still favor prep — but not by enough to motivate a behavior change.
What does motivate it: knowing your food is clean, knowing the portions match your goals, and not having to think about dinner on a Tuesday night. See the full breakdown at meal prep vs eating out: full cost comparison.
Using the calculator for a family
Family meal prep math works slightly differently. Bulk shopping at warehouse clubs (Costco, Sam's Club, BJ's) drops the per-meal cost by 10–15%, not because the food is cheaper per pound but because you waste less (bigger packs, fewer single-serving items, fewer trips). Families of four or more typically come in under the calculator estimate if they shop weekly and freeze leftovers.
Prep for kids often costs less per meal, not more: smaller portions, cheaper ingredients (PB&J, cheese sticks, simpler pasta), and less variety needed. If you want a version tuned for families, the meal prep guide walks through batch-cooking for 4+ including freezer strategy.
Ready to plan the actual week? Try the weekly grocery list template, then come back and re-run the calculator with your refined numbers.