Cooking at Home Saves ¥42,000 a Year — If You Know Where the Money Actually Goes

“Home cooking saves money” — but does it, really?

You buy chicken breast at the supermarket and make salad chicken at home. It feels cheaper than buying from a convenience store. But have you ever added up the electricity cost and seasonings and actually compared the numbers?

I hadn’t. I’d been operating on “home cooking is probably cheaper” for 20 years.

Then in April 2026, BRUNO (a Japanese home appliance brand) actually did the math. Four staples — salad chicken (sous vide–style cooked chicken breast, a Japanese convenience store staple), karaage (Japanese fried chicken), corn potage soup, and grated daikon radish — were measured head-to-head against their store-bought counterparts. The result: annual savings of up to ¥42,000. The study was picked up by CLASSY. magazine and has been circulating widely over the past month.

Honestly, my first reaction was “this sounds like marketing math.” A home appliance brand saying “home cooking is cheaper” has an obvious incentive. That’s what you’d expect them to say.

But when I read the methodology, I found it was backed by actual data: the Ministry of Agriculture, Forestry and Fisheries food price survey and Tokyo metropolitan retail price data. Electricity was calculated at ¥31/kWh. “This is worth verifying,” I thought.

So today I’m recalculating that ¥42,000 figure using my own household budget — and then going one step further to plan where that money actually goes. The goal isn’t to end with a savings tip. It’s to design the money’s next destination.

BRUNO Actually Measured 4 Staples Against Store-Bought

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First, let me lay out what BRUNO measured. The press release, titled “Is Home Cooking Really Cheaper? BRUNO’s Real-World Test,” was distributed through PR TIMES in April 2026 and picked up in full by CLASSY.

The four items tested:

Item	Comparison	Annual savings from home cooking
Salad chicken	Convenience store purchase vs. home sous vide	~¥16,500
Karaage (400g)	Supermarket deli vs. home air fryer	~¥6,500
Corn potage soup	Ready-made packet vs. homemade	~¥8,300
Grated daikon	Pre-grated / frozen vs. home blender	~¥10,500

Total: approximately ¥42,000. That’s the “up to ¥42,000 annually” figure.

Looking at the numbers, the salad chicken figure of ¥16,500 stood out immediately. That’s based on buying from a convenience store 5 times a week — which is plausible for busy dual-income households. I know people who genuinely eat convenience-store chicken breast 4–5 times a week.

Karaage at ¥6,500 was smaller than I expected. Based on 400g once a week for a family of four, that’s a pretty typical frequency. The gap between supermarket deli and homemade turns out to be fairly modest.

“Home cooking saves ¥42,000 a year” sounds dramatic as a headline. But break it down by item and you can see which ones give you real leverage — and which ones don’t. That’s an important distinction for actual household budgeting.

Opening Up the ¥42,000 Calculation With a Budget-Tracking Eye

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BRUNO’s study rests on three assumptions. Understand those or the number means nothing.

First: food prices are drawn from the Ministry of Agriculture, Forestry and Fisheries food price survey (March–April 2026). This is a monthly publication of average retail prices across approximately 470 supermarkets nationwide. I used this data regularly during my advertising agency days. It’s a reliable primary source.

Second: Tokyo metropolitan retail price data from March 2026 is used as a supplementary source. Tokyo food prices tend to run higher than the national average, so households outside Tokyo may see a smaller gap.

Third: electricity is calculated at ¥31/kWh — the standard reference rate used by Japan’s Fair Trade Council for Household Appliances. Actual electricity costs vary by plan and region. If you’re on a new electricity provider or a time-of-use plan, you’ll pay less.

The key point: this number moves depending on your assumptions. A household that doesn’t eat salad chicken 5 times a week. A family that has karaage once a month. A household in a rural area with cheaper produce. In all of these cases, the ¥42,000 conclusion changes.

Most personal finance articles never show the assumptions. “Save ¥XX,000 a year” circulates on its own. What makes this BRUNO study trustworthy is that they published every calculation assumption. That’s worth noting.

I wasn’t always comfortable with numbers. Three years in advertising, watching KPIs daily, taught me that “a number without its assumptions means nothing” — and that instinct applies equally to household budgeting. When you hear “¥42,000 a year,” the next question isn’t “great, let me start” — it’s “in my household, what’s the actual number?” Work that out first. That’s the first step in protecting a household budget.

I Re-Ran All Four Items on My Own Household Budget

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Now the main event. What follows is not BRUNO’s data applied directly — it’s my own independent calculation using my household’s actual numbers. Where my assumptions differ from BRUNO’s, I’ll say so.

My household: me, my husband, and one young child. Three people total. I’m mostly at home with occasional freelance work. My husband is out visiting clients most days. Our child is pre-school age.

Salad chicken. My husband sometimes buys convenience-store chicken breast on the road, but nowhere near 5 times a week. More like twice a week. Applying BRUNO’s formula at that frequency: around 40% of ¥16,500, so roughly ¥6,600 annually. Still meaningful.

Karaage. This one we cook at home frequently — about 1.5 times a week. Supermarket pre-made is roughly ¥500 for 400g; home-cooked (chicken thigh ¥280 + oil and seasonings) comes to around ¥350. That’s ¥150 per session × 1.5 sessions/week × 52 weeks = approximately ¥11,700 annually. Higher than BRUNO’s ¥6,500. Why? We’re a family of three — adults and a small child — and we often can’t finish a full store-bought portion in one sitting. Cooking at home lets us make exactly the right amount. “Less food waste by making the right portion size” is a hidden benefit of home cooking I hadn’t thought to calculate.

Corn potage soup. Honestly, this one doesn’t generate much savings in my household. I make corn soup only two or three times a month, and we don’t buy the packaged version often either. BRUNO’s ¥8,300 assumes daily or near-daily consumption. That’s not our household. I’d estimate maybe ¥2,000 for us annually.

Grated daikon. Frequency-dependent here too. We have grilled fish roughly once a week, and I add grated daikon. I already own a ceramic grater from a ¥100 shop, so no appliance needed. That brings the savings well below BRUNO’s number — roughly ¥3,000 annually.

My household total: approximately ¥23,300 per year. Roughly half of BRUNO’s ¥42,000. “Only half?” Fair reaction — but that still works out to just under ¥2,000 per month. In our household, ¥2,000 a month covers one extracurricular activity for our child. That’s substantial.

The realization here: BRUNO’s number is the maximum — the ceiling if every assumption aligns. Salad chicken 5x/week, finishing every batch of karaage, habitual corn soup, daikon every other day. The household that hits all of those gets ¥42,000. For everyone else, the realistic number is lower — but even half is ¥20,000+ annually.

One trap worth flagging: If you decide to make salad chicken five times a week and go all-in, your family will probably get bored by week three. That happened to me. I made batches ahead, my family lost interest, and I ended up throwing out two servings — roughly ¥600 in waste. Annualized, that’s ¥7,200 in food loss. BRUNO’s calculations don’t include food waste, so you have to subtract that yourself.

In other words: calculate both the ceiling of savings and the floor of waste, then arrive at the real net figure. For salad chicken, I now run a two-week cycle: two consecutive weeks of making it, two weeks off. Zero waste, and the per-session average still makes the math work. Small but important.

Of the four items, where should you start? Based on my calculations, I’d apply two filters:

First: start with the item you buy most frequently. Savings scale with frequency. If you’re eating something five times a week, the gap is significant. If it’s twice a month, it’s small. Pull up last month’s receipts and find the item you bought most often. Switching that one first gives you the fastest feedback.

Second: prioritize items you can start with tools you already own. Before buying new appliances, lock in the items that work with what’s in your kitchen now. Once you see results, that’s the time to consider equipment. Reverse that order and you end up with a new appliance that sits unused — a very common pattern.

In our household, karaage was the first item we switched. High frequency (1.5x/week), doable in a regular frying pan, and the leftovers work as next-day bento. All three conditions were met. That’s why it stuck.

Writing “Where the ¥42,000 Goes” Into the Household Budget

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This is the real point of today’s piece. With ¥42,000 saved — or ¥23,300 in my household’s case — where does it go?

About 95% of personal finance articles stop before this question. “You can save ¥42,000 a year!” is the ending. But that’s where household finances don’t actually change. Money that’s “freed up” quietly gets absorbed somewhere else.

Three years ago, I hit a monthly savings goal of ¥10,000 and felt proud of myself. Six months later I opened my budget tracker and was stunned. ¥60,000 that should have been there wasn’t. Stress shopping. Eating out. New subscriptions. All “just this once” that stacked up invisibly.

Since then, I’ve kept a column in my budget called “redeployment” — right next to “savings.” Whatever gets freed up gets moved to a different category in the same month. Without that move, savings just becomes “I feel like I have more money to spend.”

Here’s how I’d redeploy ¥42,000 — or in my case ¥23,300.

Half (¥11,500) goes to increasing my NISA contributions. Japan’s NISA is a tax-advantaged investment account (similar to a Roth IRA in the US or an ISA in the UK — gains are tax-free within the account). I currently contribute ¥30,000/month in index funds. Adding ¥1,000/month (¥12,000/year) isn’t a huge jump, but compound interest matters. At 5% annual return over 20 years, ¥1,000/month becomes roughly ¥410,000. ¥1,000 a month in savings becomes ¥410,000 at retirement. That’s what “beyond savings” means in numbers.

The other half (¥11,500) goes to family experiences. Once a year, a one-night family trip — me, my husband, our child. This isn’t “spending” in my mental accounting; it’s “converting money into family memory.” Our child may or may not remember it when grown. But I will. My husband will.

Why half-and-half between investing and experiences? Because a household budget runs on both “future security” and “present happiness.” All savings and you lose the joy of now. All experiences and you’re anxious about later. Half-and-half is the balance that works for us.

Your ratio will be different. If your child’s education expenses are approaching, 70% savings makes sense. If you’re a dual-income couple without children, 30% savings / 70% experiences might fit better. What matters isn’t the split — it’s the rule: freed-up money gets a destination assigned to it. That’s the only rule.

When I brought this proposal to my husband, his first reaction was essentially “so I’m being conscripted into the food budget savings plan now?” I understood. So I offered a modification: half of his saved lunch budget goes into a ring-fenced pot for his own hobbies — an extra ¥3,000/month to spend on whatever he wants. That landed. The moment it became “also good for me,” he was cooperative. Same principle as advertising incentive design, now applied to household negotiations.

Households where financial improvement doesn’t stick usually have a split dynamic: one person bearing the cost of discipline, the other not. The person absorbing all the discipline burns out within six months. Design the savings so that everyone gets a small win, and the whole family moves in the same direction. That’s the foundational condition to set before thinking about appliances at all.

3 Rules for Making the Home Cooking Shift Actually Stick

If you’ve gotten this far and are thinking “we should shift to more home cooking” — check these three things first. Learned through trial and error.

Rule 1: Don’t buy new appliances first.

BRUNO’s study used a sous vide cooker, a glass air fryer, and a multi-stick blender. Buying all three new would run ¥30,000–40,000. Year one math wouldn’t break even.

Start with the tools you already own for one month first. Salad chicken can be made in a saucepan. Karaage works in a frying pan with shallow oil. Grated daikon just needs a cheap grater from a ¥100 shop. Confirm you can actually sustain the habit before considering equipment upgrades. Reverse the order and you get a common pattern: new appliance, habit that doesn’t stick.

Rule 2: Set a frequency and write it on a calendar.

Without making “how many times a week, which items” visible, “too tired today, let’s get convenience food” wins every time. I have a small whiteboard stuck to the side of the fridge: Monday = salad chicken, Wednesday = karaage. Fixed schedule means no decision-making required in the moment. That’s what makes it sustainable.

Rule 3: Get both partners on the same page before starting.

This seems obvious, but it’s the most important one. A home cooking shift tends to become a system where the person who cooks carries all the effort. My household made this mistake at the start. I was putting in the work, my husband was still buying convenience lunches. That’s not fair — and it doesn’t hold.

I had a numbers-based conversation with my husband: “We want to free up ¥X per month from food costs. Can you cut from convenience lunch five days a week down to three?” Talking in numbers makes each person’s contribution visible. That’s what makes agreements stick.

Wrap-Up: One Item, This Month

That was a lot. One action to take away.

Switch one of the four items this month. Just one.

Trying to do all four at once leads to failure. Salad chicken only, karaage only — pick whichever one. Sustain it for a month. If it feels manageable, add another item next month.

BRUNO’s ¥42,000 is the maximum. Going for the maximum from day one is how you burn out. Half is fine. A third is enough. Gradually increasing the home-cooked ratio and redirecting the savings to a designated category — that’s all it takes to actually move a household budget.

I’ve been doing this for three years: average monthly food savings of ¥8,000, an extra ¥96,000 in savings annually. It started with salad chicken only. ¥1,200 freed up in month one. That ¥1,200 is what compounded into ¥96,000 three years later.

Household finance isn’t about home runs. It’s about consistent singles. What BRUNO’s study gave us is proof that home cooking has real, calculable savings — not just a feeling. No more or less than that.

The flip side: if a savings claim can’t be explained with numbers, you don’t have to trust it. The “I saved ¥XX,000 this year” anecdotes that circulate on social media often don’t show their assumptions. You can borrow the calculation framework from this piece directly. Once you have the template — “what’s the number for my household’s frequency?” — you can apply it to any other savings idea that comes along.

Trust the numbers. Apply them to your household. Give every freed-up yen a destination. That’s what I believe “a budget that protects the family” looks like.

What will you start with this month? Open the fridge and pick one item. That’s where it begins.

Sources

• Is Home Cooking Really Cheaper? BRUNO’s Real-World Test (PR TIMES, April 2026)
• Is Home Cooking Really Cheaper? BRUNO’s Real-World Test (CLASSY., 2026)
• Ministry of Agriculture, Forestry and Fisheries Food Price Survey
• Tokyo Metropolitan Retail Price Trends (March 2026)