Running Google Ads on a Small Budget for BtoB — How to Design and Run a Weekly Routine That Delivers Results on a Few Tens of Thousands of Yen a Month

“I’m interested in Google Ads, but I can only spare a few tens of thousands of yen a month at most — is that even worth doing?” This question comes up often. The short answer: a small BtoB budget works, as long as you get the narrowing right. This article is the practical guide to that narrowing.

The overall division of labor between SEO and ads is laid out in SEO and Google Ads for Technical B2B Sites. This article goes deeper on one specific question: what to cut, and what to keep, when the budget is small. As a premise, the sequencing argument that you should fix your landing spot (the service page) and your funnel (the form) before you touch ads is covered in Increasing Inquiries on BtoB Sites — the Full Map of What to Fix, in What Order; refer to that first.

1. The bottom line first — what to do and what not to do on a small budget

The enemy of a small budget is dispersion. A small budget by itself isn’t the problem — the problem is thinly spreading that small budget across broad keywords and broad placements.

2. Understanding how the budget mechanism actually works — “1,000 yen a day” isn’t literally 1,000 yen a day

Start by getting the billing mechanics exactly right. What you set in Google Ads is an average daily budget, and the amount spent day to day fluctuates. On high-traffic days, up to twice the average daily budget can be spent in a single day, and on a monthly basis the billing cap is average daily budget × 30.4 (any amount beyond that cap is not billed to you).¹

In other words, setting “1,000 yen a day” really means, in practice, “a pool of a bit over 30,000 yen a month, which Google allocates day by day based on search demand.” Don’t react to day-to-day swings — judge by monthly spend and monthly results. Conversely, if you’re working backward from a monthly budget, set your average daily budget to “monthly budget ÷ 30.4.”

3. What to decide before you launch — never skip conversion tracking

Precisely because the budget is small, set things up first so you can judge the meaning of every single click. Google itself lists accurate conversion data and a measurement foundation (tags, enhanced conversions, consent mode) as the groundwork for running ads.²³

At minimum, do these two things:

1. Register “inquiry form submission” as a conversion. Track either the display of the confirmation page or the form-submit event itself. If phone calls are your main channel, register phone-click conversions too.
2. Send a test submission and confirm the conversion is recorded in the dashboard. Skip this, and months of ad spend teach you nothing.

One more real-world pitfall worth checking: the form can submit successfully while its notification email never actually reaches you. Before launching ads, it’s worth reviewing Why Contact Form Emails Don’t Arrive, and How to Fix It as a safety check.

4. Keyword design — keep only the words from people who “want to hire someone right now”

At a few tens of thousands of yen a month, the clicks you can afford number in the dozens, depending on CPC. Spend every one of those dozens of clicks on searches with strong inquiry intent.

BtoB search terms broadly split into two layers.

Match types govern which search terms a keyword matches, and there are three: broad match, phrase match, and exact match. Broad match shows your ad for a wide range of searches related to the keyword, which makes it easy to burn through a small budget on unintended searches.⁴ On a small budget, starting with phrase match and exact match, then expanding while watching the search terms report, is easier to control.

At the same time, register negative keywords from day one. A negative keyword stops your ad from showing on searches containing a specified term.⁵ For a BtoB contract-work business, the usual candidates include:

• “jobs,” “hiring,” “salary” (job-seeker searches)
• “free,” “free software,” “do it yourself” (searches with no intent to hire out the work)
• “what is,” “meaning,” “beginner’s guide” (learning-oriented searches)

5. Trim waste in your delivery settings — location and time of day

After keywords, the next lever is delivery conditions. Google Ads lets you target the areas where your ad shows by country, prefecture/state, city, or a radius from a location.⁶ For a business with a fixed trade area (locally-focused development, maintenance, licensed professional services, and so on), restricting delivery to just your service area alone visibly cuts wasted clicks. For a local business, it makes sense to think about this setting together with building out your local SEO.

If phone conversions are your primary channel and you can only answer calls during business hours, there’s an option to weight your ad schedule toward those hours. But if form submissions are your primary channel, late-night searches can still turn into inquiries, so it’s better not to restrict time-of-day too aggressively from the start.

6. Ad copy and landing pages — don’t send traffic to the homepage

Send traffic (the landing page) to the service page that matches search intent. Landing page experience is one of the components of ad quality evaluation, and a mismatch between the search term and the page content directly hurts your ad’s cost-effectiveness.⁷ Someone who searched “Windows app development outsourcing” and lands on your homepage, then has to go hunt for the service page — that alone increases drop-off.

Write your ad copy not as a rephrasing of the search term, but as a compressed version of the reason to talk to you. Work candidates for your headlines around who it’s for (e.g., “for revamping an existing Windows application”), what your edge is (e.g., “handles migrations that include COM/ActiveX”), and what happens next (e.g., “you can start by just discussing your current situation”). For the details of building responsive search ads, see section 4.5 of SEO and Google Ads for Technical B2B Sites.

If you feel your service page itself is weak, fix the page before you touch ads. The approach to structuring it is covered in How to Build a Service Page — an Organizing Framework for Technical B2B.

7. Bidding on a small budget — automate only once the data has accumulated

Google’s automated bidding (Smart Bidding) optimizes your bid for every single auction based on your conversion data.⁸ It’s powerful, but the material it learns from is your actual conversion history. On a small account generating only a handful of conversions a month, handing it a target with so little to learn from tends to make delivery unstable.

The realistic approach is staged:

1. At launch: use Maximize Clicks with a max CPC cap, or manual CPC, so you control yourself how much you’re willing to pay per click.
2. Once conversions start recording steadily: move to a conversion-based automated strategy such as Maximize Conversions or Target CPA.
3. Treat the 2-4 weeks after switching as a learning period, and avoid touching the settings frequently.

The point of this sequence isn’t “never use automated bidding” — it’s to first build the state automated bidding needs to learn from (accurate tracking plus a baseline volume of conversions).

8. The weekly operating routine — 15 minutes is enough to check search terms

Once your ads are live, run this weekly, 15-minute routine.

1. Open the search terms report. This shows the actual search terms that triggered your ad, along with their performance.⁹
2. Add mismatched terms to your negative keyword list. This is where the biggest gains happen in the first month or two.
3. Note down the terms that converted. These are candidates for promotion to exact-match keywords, and at the same time they’re demand data worth feeding back into SEO — your articles’ and service pages’ headings and FAQs.
4. Monthly, log spend, clicks, conversions, and cost per conversion.

That fourth item — the log — is what gives you the basis for deciding whether to keep going, stop, or increase budget. Whether “30,000 yen for one inquiry a month” is expensive or cheap can only be judged against that inquiry’s close rate and deal size. Review not just the numbers in the ads dashboard, but the substance of the inquiries themselves — how promising each one actually was — every month.

Summary

Running Google Ads on a small BtoB budget comes down to this pattern.

• Mechanics: average daily budget × 30.4 is your monthly billing cap. Judge by the month, not by day-to-day swings.
• Preparation: never skip conversion tracking setup. Send traffic to the service page.
• Narrowing: keep only strong-intent-to-hire terms, on phrase match and exact match. Negative keywords from day one. Narrow location and placement to match your trade area too.
• Operation: a weekly search terms report check. Automate bidding only once conversion data has built up.

Even on a small budget, ads hand you demand data every single week — which search terms actually turn into inquiries. Feeding that data back into your service pages and SEO, on top of running the ads themselves, is where the real value of small-budget advertising lies.

We can help with the design of the service pages your ads land on and the setup of conversion tracking through website development, and with prioritizing your overall approach through technical consulting and design review.

Related articles

• SEO and Google Ads for Technical B2B Sites
• Increasing Inquiries on BtoB Sites — the Full Map of What to Fix, in What Order (From Traffic to the Form)
• How to Build a Service Page — an Organizing Framework for Technical B2B
• Why Contact Form Emails Don’t Arrive, and How to Fix It
• Make Your Site Show Up for Local-Name Searches — A Practical Local SEO Guide for SMEs
• Website Production Costs for SMEs — a Pricing Quick-Reference and How to Read a Quote

Related consulting areas

• Website Development
• Technical Consulting & Design Review
• Contact

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Frequently Asked Questions

Common questions about the topic of this article.

How much budget do I need to start?

Mechanically, you can advertise for just a few hundred yen a day. But BtoB search ads often carry a cost per click in the hundreds to low thousands of yen, so if the budget is too small you'll only buy a handful of clicks a day, and it takes a long time to accumulate enough data to judge anything. As a rough guideline, budget for 30-50 clicks a month at your expected CPC; if that's out of reach, narrow your keywords even further down to a single theme you absolutely want to win.

With a small budget, should I prioritize SEO or ads?

Assuming your landing page (service page) and inquiry flow are already solid, ads show results faster. SEO takes months to show effect, while ads give you data — which search terms, landing on which page, leading to which inquiries — starting the very week you launch. The efficient approach on a small budget is to run both in a cycle: feed the search terms that performed well in ads back into your SEO articles and service pages.

Should I also run P-Max or display ads?

For a small BtoB budget, a search campaign alone is enough to start. P-Max and display reach much broader placements, and with a monthly budget of just a few tens of thousands of yen, that spend tends to spread thin across clicks with weak inquiry intent. Once search ads have identified the search terms that actually convert and your budget has more room, it's not too late to consider them.

Should we run this ourselves, or hire an agency?

With a monthly budget of a few tens of thousands of yen, an agency's management fee (typically around 20% of ad spend, or a fixed minimum) often ends up being disproportionately large. Within the scope covered in this article — one search campaign, high-intent keywords, a weekly search-terms check — running it yourself is entirely workable. That said, the initial setup of conversion tracking is the one part that trips people up most often, so a practical split is to bring in a specialist just for that piece and handle the day-to-day running in-house.

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Go Komura

Representative of KomuraSoft LLC

Focused on Windows software development, technical consulting, and investigations into failures that are difficult to reproduce.