Calculateur fait maison ou acheté en magasin
Guide détaillé à venir
Nous préparons un guide éducatif complet pour le Calculateur fait maison ou acheté en magasin. Revenez bientôt pour des explications étape par étape, des formules, des exemples concrets et des conseils d'experts.
The Homemade vs Store-Bought Calculator answers the practical question: 'Is it actually cheaper to make X at home?' for common food categories like bread, pasta, yogurt, granola, salsa, pizza dough, hummus, and kombucha. The calculation factors in raw ingredient cost, batch yield, your time investment, and the value of your time. Some items (granola, bread, hummus, salsa) are dramatically cheaper homemade and worth the effort; others (yogurt, kombucha) reach near-break-even after factoring time cost; a few (pasta, kimchi made from scratch) can actually cost more homemade once your time is valued at typical hourly rates. The homemade-vs-store-bought question has become culturally significant. Sourdough culture exploded during 2020 lockdowns; the maker-food movement (DIY bread, fermenting, scratch cooking) intersects with both frugality and quality-of-food concerns. Specialty store-bought options have proliferated — artisan bread, premium yogurt, craft kombucha — creating wider price ranges that change the math compared to comparing homemade to budget-tier store equivalents. A $3 store loaf of mass-market bread is much cheaper to replicate at home than a $9 artisan sourdough loaf. The calculation has three components beyond raw ingredient cost. First, batch yield: a single bread bake produces one loaf (low yield, time cost concentrated); a batch of granola produces 6–8 cups (high yield, time amortized). Second, active vs passive time: 30 minutes of active work for a 4-hour sourdough rise is very different from 30 minutes of continuous attention. The calculator uses active time only. Third, hourly value: a retiree with abundant time may value time at $0–10/hour; a busy professional at $50–100/hour. The same recipe can be cheaper or more expensive depending on this single input. This calculator helps you make item-by-item economic decisions about which homemade projects are worth your time. Enter the food category, your typical batch ingredient cost and yield, store equivalent price and yield, active prep time, your hourly time value, and weekly consumption frequency. The calculator outputs homemade cost per unit (with and without time), store cost per unit, and annual savings — both with time cost included (the realistic measure) and money-only (relevant if you cook for enjoyment regardless of time).
Homemade True Cost per Unit = (Ingredient Cost / Batch Yield) + (Active Time/60 × Hourly Value / Batch Yield); Annual Savings = (Store per Unit − Homemade True Cost) × Weekly Frequency × 52
- 1Step 1 — Select the Food Category: Choose from bread, pasta, yogurt, granola, salsa, pizza dough, hummus, kombucha, or 'other.' Each category has typical patterns: bread is medium-yield (1 loaf) with moderate active time; granola is high-yield (6+ cups) with low active time; pasta is medium-yield with high active time (rolling/cutting is labor-intensive). Category selection helps you set realistic expectations.
- 2Step 2 — Enter Homemade Section: Input total ingredient cost for one batch (sum of flour, water, yeast, salt for bread, for example) and batch yield (1 loaf, 6 cups, etc.). Be honest about ingredients — don't omit kitchen staples that you'll buy on your next shopping trip anyway. For sourdough, factor in flour and starter feeding maintenance cost.
- 3Step 3 — Enter Active Time and Hourly Value: Active time is hands-on work only. Bread: ~30 minutes of mixing, kneading, shaping. Sourdough: ~30 minutes mixing + 5 minutes for each of 3 stretches = 45 minutes total. Granola: ~15 minutes mixing and baking attention. Hourly value: your wage rate, or $0–10 if cooking is leisure for you.
- 4Step 4 — Enter Store-Bought Section: Cost of comparable store-bought product. Use mid-range comparable quality. A $3 mass-market loaf may be the realistic alternative to homemade for most users, but if you typically buy $9 artisan sourdough, use that as the store comparison. Store yield: package size in same units as homemade batch.
- 5Step 5 — Set Weekly Consumption Frequency: How many units do you actually eat per week? Bread: 1–2 loaves. Yogurt: 1 quart. Granola: 2–4 cups. Don't inflate this — projecting savings based on unrealistic consumption produces misleading results.
- 6Step 6 — Calculate Per-Unit Costs: Calculator computes Homemade per Unit (ingredients only) = IC / BY. Time Cost per Unit = (Active Minutes / 60 × Hourly Value) / BY. Homemade True Cost = Homemade + Time Cost. Store per Unit = SP / SY. Compare True Cost vs Store Per Unit to see which is genuinely cheaper.
- 7Step 7 — Review Annual Savings: Calculator projects savings = (Store per Unit − Homemade True Cost) × Weekly Frequency × 52. Positive value means homemade saves money including time cost; negative means store-bought is cheaper when time is valued. Also shown: money-only savings (ignoring time) for users who cook recreationally regardless of time value.
Bread baking is hobby, not frugality — money-only savings $3/loaf, $312/year
Pure ingredient cost ($1.50) is dramatically cheaper than store ($4.50). But adding 30 min × $25/hr = $12.50 time cost makes the true cost $14/loaf — far more expensive than store. The $312/year money-only savings is real if you bake as a hobby (counting time at $0), but if your time has $25/hour value, you're losing $988/year baking bread vs buying. Conclusion: bake bread for love, not money savings — or accept lower hourly value during baking sessions.
High batch yield amortizes time cost; granola is genuinely cheaper homemade
8 cups from a single 15-minute batch means 1.87 minutes of time per cup = $0.78 time cost. Plus $0.63 ingredient cost = $1.41 true cost vs $2 store. Net savings $0.59/cup × 4 cups × 52 weeks = $123 (with time); money-only savings without time accounting would be $285/year. Granola is a 'high-leverage' homemade project — minimal time investment produces 8+ servings.
Yogurt makes sense for quality preference, not pure economics — time cost dominates
Even with only 10 minutes active time, 1 batch yields 1 quart so time cost is $4.17/quart. Total $8.17 exceeds store $5.99. Money-only ($1.99 savings/quart × 52 = $103) is real if you enjoy making yogurt. The unique benefit of homemade yogurt: full control over ingredients (milk quality, culture strain, sweetener choice). Better motivation than economics for most home yogurt makers.
Hummus is dramatically cheaper homemade — store hummus has high markup
Specialty store hummus ($5.99/cup) carries massive markup over ingredient cost ($2 makes 1.5 cups). 10 minutes active time × $25/hr / 1.5 cups = $2.78 time per cup. True cost $4.11 vs $5.99 store = $1.88 savings per cup. Even valuing time at $25/hour, homemade hummus saves nearly $100/year for weekly users — and homemade is generally fresher and customizable to taste.
Sourdough hobbyists checking if their hobby is actually frugal or just enjoyable — quantifying the 'paying for quality with time' tradeoff
Bulk-cooking enthusiasts deciding which categories give best ROI for time investment to focus weekly meal prep on highest-impact items
Anyone evaluating fermenting projects (yogurt, kombucha, sauerkraut, pickles) for cost savings vs convenience
Beginning home cooks identifying gateway projects (granola, hummus) that build skills without requiring large time investments
Budget-conscious cooks identifying which store-bought items have the highest markup and biggest savings potential through home preparation
| Item | Homemade Cost | Store Cost | Time | Best For |
|---|---|---|---|---|
| Granola (per cup) | $0.63 | $2.00 | 1.9 min/cup | Always cheaper, easy |
| Hummus (per cup) | $1.33 | $5.99 | 6.7 min/cup | Dramatic savings, popular item |
| Salsa (per cup) | $1.50 | $4.50 | 10 min/cup | Fresher, easy to customize |
| Pizza Dough (per pizza) | $0.75 | $3.99 | 10 min/pizza | Strong savings + quality |
| Bread (per loaf) | $1.50 | $4.50 | 30 min/loaf | Money saver if hobby |
| Pasta (per lb) | $1.50 | $1.50 | 30 min/lb | Equal cost, time-intensive |
| Yogurt (per quart) | $4.00 | $5.99 | 10 min/quart | Quality > cost |
| Kombucha (per gal) | $3.00 | $15.00 | 30 min/gal + 14d | Time-intensive but big savings |
Which foods are most worth making at home?
Highest ROI for time and money: granola, hummus, salsa, pizza dough, bread (if you love baking), pesto. These items have high store markup over ingredient costs, decent batch yield, and reasonable active time. Lowest ROI: pasta (cheap to buy at $1–2/lb, time-intensive to make from scratch), kombucha (specialty store price already competitive with home brew supplies plus time), and items requiring specialty equipment (sausages, cheeses) where equipment cost amortizes slowly.
Should I count my time as a cost?
Depends on context. If cooking is genuine leisure (you enjoy it for its own sake), don't count time — the activity has intrinsic value beyond the food output. If cooking is work (you'd rather do something else), count time at your hourly value. Most people fall in between for different items: bread baking might be leisure (no time cost), but pasta-making might be work (full time cost). Be honest about which category each item falls into for you specifically.
How do I factor in equipment costs?
Spread equipment cost across expected lifetime use. A $100 stand mixer used weekly for 5 years = $0.38/use. A $300 sourdough setup (banneton, scoring lame, Dutch oven, scale) used twice weekly for 5 years = $0.58/use. Add these per-use costs to ingredient cost when comparing. One-time tools (banneton, baking steel) become essentially free at 100+ uses. Specialty equipment (yogurt makers, kombucha vessels) requires more careful amortization at lower use frequencies.
What about the quality difference?
Hard to monetize but real. Homemade bread is often dramatically better than mass-market store equivalents, though comparable to artisan bakery quality at $7–12/loaf. Homemade granola can be customized to your exact taste preferences. Homemade hummus is typically fresher and more flavorful than store. For some items, quality difference alone justifies the time investment regardless of cost economics. Frame homemade as 'paying for quality with time' rather than 'saving money.'
How do I avoid waste with homemade?
Match batch yield to consumption. Don't make a 2-loaf bread bake if you'll only eat 1 loaf this week — the second loaf may go stale. Granola stores 2–3 weeks airtight. Yogurt 2 weeks refrigerated. Hummus 5–7 days refrigerated. Pizza dough freezes well for 3 months. Plan batch size around realistic consumption to capture the per-unit savings without wasting half the batch.
Is making bread really cheaper than buying it?
Money-only: yes (typically $1.50 ingredients vs $3–5 store). Time-included: usually no for most people. A $1.50 ingredient cost + 30 minutes active time at $25/hour = $14 true cost per loaf — far more than the $5 store equivalent. Bread baking is best framed as a hobby with the food as a byproduct, rather than a frugality strategy. The 30+ minutes you spend mixing, kneading, and shaping have to compete with everything else you could do with that time.
How long do homemade items last vs store equivalents?
Generally shorter — homemade lacks preservatives. Bread: 2–3 days (vs 7+ for store). Yogurt: 2 weeks (vs 4+ for store). Hummus: 5–7 days (vs 2 weeks for store with preservatives). Granola: 2–3 weeks airtight (similar to store). Salsa: 5–7 days (vs 2 weeks for store). Plan consumption around shorter shelf life — make smaller batches more frequently rather than large batches that go to waste.
Conseil Pro
Start with high-yield items (granola, hummus, salsa) that have short active time and produce large batches lasting 1–2 weeks. These give the best learning curve and ROI before scaling to time-intensive items like sourdough that require ongoing technique investment. Use the calculator's money-only savings (ignoring time) to identify which items would be worth doing as hobbies vs items that need actual cost savings to justify the effort.
Le saviez-vous?
The 'cottage food' movement — selling homemade food from your residence — has been legal in most US states since 2010 with varying restrictions. Bread, jams, granola, baked goods, and dried herbs are typically allowed; meat products, dairy, and acidic canning typically require commercial kitchen certification. Some home bakers run profitable side businesses selling sourdough bread at $8–12/loaf to local customers, transforming what this calculator might show as 'unprofitable hobby' into actual income through the price-quality premium of artisan home baking.
Obtenez des conseils mathématiques hebdomadaires
Rejoignez les abonnés 12 000+ qui reçoivent des conseils sur la calculatrice chaque semaine.