How much is a ramen shop’s profit margin? Calculating the money left in your hand

The line formed again this month. The sales numbers aren’t bad either. And yet, once you pay the loan repayment and your own living costs, almost nothing is left in the bankbook.

Whether a ramen shop is making money is decided not by sales, but by the profit left after subtracting expenses. And in a shop run as a sole proprietor, the profit on the books and the money actually left in the owner’s hand are not the same. Taisei Kikai Kogyo, a noodle-machine manufacturer, has put together — based on Japan Finance Corporation’s materials — how to think about a ramen shop’s profit margin and how to calculate the money left in your hand.

1. How much of sales is left as a ramen shop’s profit?

A ramen shop’s profit is found by subtracting four expenses from sales. The four expenses are the cost of ingredients and the like, the labor cost such as staff wages, rent, and other expenses such as utilities, advertising, and loan interest.

A document that Japan Finance Corporation put together for people starting a food-service business lists average cost ratios and labor-cost ratios by industry. There are no figures for ramen shops alone, but for Chinese restaurants, a close category, the cost ratio is 36% and the labor-cost ratio 39%.

Source: Japan Finance Corporation, “To those newly starting a food-service business: Guide to Founding a Business Plus” (September 2025), p.12. The original data is the industry-average management indicators from the JFC Research Institute’s “Survey of Management Indicators of Small Enterprises 2023”. The “remainder after the two are subtracted from sales” is calculated by us (confirmed October 26, 2026).
*If the table is cut off, scroll sideways to view it.

With the Chinese-restaurant average, by the time you’ve paid cost and labor, only a quarter of sales is left. From that 25% you pay rent, utilities, loan interest, and the like, and what remains after that becomes profit. For a shop that uses, say, 15% of sales on rent, utilities, and such, the profit works out to about 10% of sales. That’s why whether you can lower the cost ratio and the labor-cost ratio by a few points each is the dividing line for whether profit remains.

2. How do you calculate profit?

Calculating profit is easier to organize by laying out one month’s figures in the same form as Japan Finance Corporation’s business-founding plan. The same guide carries a worked example of a food-service business-founding plan. It isn’t a ramen-shop example, but it’s enough to learn the shape of the calculation.

Source: the worked example of the business outlook (monthly average) on p.10 of Japan Finance Corporation’s “Guide to Founding a Business Plus”. The profit margin (in parentheses) is calculated by us. The labor cost in the worked example does not include the proprietor’s (owner’s) own portion in the case of a sole proprietorship.

In the worked example, as sales grow, the profit margin too rises from about 13% to about 17%. Rent stays at 200,000 yen even as sales increase, so the more sales grow, the lower the share of rent against sales, and the profit share increases by that much. Conversely, if sales fall below the outlook, the share of fixed costs such as rent rises, and profit drops sharply. The JFC guide, too, recommends estimating sales on the low side and expenses on the high side, and building an income-and-expenditure plan that still holds up.

3. How do the profit on the books and the money left in hand differ?

In a ramen shop run as a sole proprietor, the profit on the books is not money the owner can freely use as it is. As the worked example’s note states, the labor cost of a sole-proprietor shop does not include the owner’s own salary, so the owner’s living costs are paid out of profit. If you’ve borrowed startup funds, the loan repayment too is paid out of profit.

In Japan Finance Corporation’s business-founding plan, the money left in hand is checked with the following two formulas.

Source: the “Repayment plan” field of the business-founding plan in Japan Finance Corporation’s “Guide to Founding a Business Plus” (confirmed October 26, 2026).

For instance, suppose the at-founding shop in the worked example has a monthly profit of 340,000 yen, a monthly loan principal repayment of 100,000 yen, and the owner’s household living costs of 250,000 yen a month (the principal repayment and living costs are placeholder figures for the calculation). With depreciation of 50,000 yen a month, the money left in hand is 340,000 + 50,000 − 100,000 − 250,000 = 40,000 yen. Even a shop with a 13% profit margin leaves the owner only about 40,000 yen a month.

4. Common causes at shops where no profit remains

The reason no profit remains is, in most cases, not one thing but several overlapping. The following four are each a separate cause, so check separately which one your own shop fits.

• High cost ratio: you haven’t reflected ingredient price rises in the selling price, there’s a lot of prep waste, the plating amount varies.
• High labor-cost ratio: prep takes time, and you’re assigning people to work outside business hours.
• Fixed costs such as rent are heavy against sales: against the location, sales aren’t reaching the outlook.
• The sales outlook was optimistic: in the pre-opening plan you overestimated sales and underestimated expenses.

The cost ratio and the labor-cost ratio are shares you can change by the shop’s own efforts. Rent is fixed by contract, and the sales outlook depends on location and customer count, so they can’t be changed quickly. To raise profit, tackling the cost ratio and the labor-cost ratio first is realistic. For the detailed way to review the cost ratio, see our column the benchmark and calculation method for ramen’s cost ratio.

5. With noodle and soup, how much can you raise profit?

What’s easiest to lower in a ramen shop — both the cost ratio and the labor-cost ratio at once — is the noodle and the soup used in every bowl every day.

How does making the noodle in-house change the profit margin?

A ball of supplier noodle contains, besides the flour cost, the supplier’s margin and the delivery cost, and by making the noodle yourself you can take that off the cost. In our research, supplier noodles are about 40-50 yen per ball and in-house noodles about 18-26 yen, a difference of about 24 yen (as of October 2026, our research).

At a shop doing 100 bowls a day, 25 days a month, the difference comes to 60,000 yen a month, about 720,000 yen a year. For a shop with a 900-yen bowl and monthly sales of 2.25 million yen, 60,000 yen a month amounts to about 2.7% of sales, so the profit margin works out about 2.7 points higher. The 60,000 yen a month exceeds the money the owner had left in hand in the section 3 calculation (40,000 yen a month). Against sales it’s a difference of a few percent, but seen in money left in hand it becomes a large difference. That said, the machine’s lease or rental fee, electricity, and the labor time for making noodles cost extra, so the profit you actually gain is the amount after subtracting those.

With in-house noodles, you can decide the noodle’s thickness, hydration, and blend to match your own soup, so you can differentiate with the noodle while raising profit. At shops with few bowls, the machine cost can be the larger figure, and it may not pay off.

What goes down when you change how you simmer the soup?

The soup is a process that, on top of the cost of bones and the like, takes gas costs for long simmering and the time of a person watching the fire. The pressure stockpot of Meiwa Seisakusho, in the same Tenpos group, can cut prep time to about half that of an ordinary stockpot, and at a shop that installed the 90 L model, the gas cost for pork-bone soup fell from 150,000 yen a month to 70,000 yen (the size of the reduction varies by prep volume and operating conditions). For details, see the explanation of cost reduction with a commercial pressure stockpot.

A shop owner who actually installed a pressure stockpot, at a chicken-paitan specialty shop, describes the change in the labor time of prep as follows.

If prep time drops, either the labor cost that was paid for that time, or the owner’s own time to rest, is freed up. It’s a part that’s hard to see in the profit calculation, but as a means of lowering the labor-cost ratio, how you simmer the soup is also worth reviewing.

6. How to try in-house noodles (with the Taisei noodle machine)

The Taisei noodle machine is a commercial noodle machine with over 30 years of history: Taisei Kikai Kogyo handles design and manufacturing, and the sole distributor Kitchen Techno handles sales and post-installation training. There are ways to check how much profit rises without buying a machine outright.

• Free ramen school: a one-day hands-on demonstration that Kitchen Techno holds once a month each in Tokyo and Osaka, and irregularly in Sapporo. You make trial noodles and soup on real equipment, and can learn opening and management know-how too.
  Tokyo venue: Tenpos Tokyo Ramen Senmonkan (2-1-14 Higashi-Ayase, Adachi-ku, Tokyo)
  Osaka venue: Tenpos Osaka Ramen Senmonkan (2-1-8 Kitajima, Suminoe-ku, Osaka)
• Rental: from 62,000 yen a month, you can place it in your own kitchen and check the cost and prep time for real. You can also discuss switching to a purchase once satisfied.
• Early delivery: the standard No.2 keeps stock for early delivery and, when in stock, can be delivered within 1-2 weeks domestically. A reconditioned used machine, when in stock, can be delivered in as little as one week.

There are three models — the No.1 for small shops and trials, the standard No.2 chosen by the most shops, and the No.3 for large-volume preparation — and every model comes standard with a mixer. Body prices are 1,688,000 yen for the No.1, 1,875,000 yen for the No.2, and 2,475,000 yen for the No.3 (all excl. tax, as of October 2026); a Stainless Version, resistant to rust and free of paint peeling, has also begun build-to-order across all models (price on inquiry).

7. Frequently asked questions

Try writing out, once, this month’s sales and the cost, labor, rent, and other expenses. Once you know the profit margin and the money left in hand after subtracting repayment and living costs, where to start comes into view.