The first hurdle companies encounter when starting Google Ads is setting their budget. In short, most SMEs run campaigns with a monthly ad budget of 100,000 to 500,000 yen, making 150,000 to 650,000 yen a month the realistic range when agency management fees are included.
In this article, we thoroughly break down the cost structure of Google Ads by ad format and industry, providing a comprehensive guide from budget planning to deciding whether to outsource ad management. You will gain the knowledge needed to run your first campaigns without failure.
Google Ads cost quick reference
| Item | Market Rate | Notes |
|---|---|---|
| Monthly ad spend (Startups) | 50,000–150,000 yen | Test campaign / learning phase |
| Monthly ad spend (SMEs) | 100,000–500,000 yen | Most common tier |
| Monthly ad spend (Mid-sized and larger) | 500,000–3,000,000 yen | Full-scale campaign phase |
| Average CPC (Search Ads) | 50–500 yen | Varies significantly by industry |
| Average CPC (Display Ads) | 10–100 yen | Substantially cheaper than Search |
| Average CPC (YouTube Ads) | 3–20 yen / view | TrueView billing |
| Agency management fee (Percentage) | 15–20% of ad spend | |
| Agency management fee (Flat rate) | 50,000–150,000 yen/month | For ad spend under 100,000 yen |
| Initial setup fee | 50,000–300,000 JPY | When outsourcing |
Google Ads ad types and cost differences
There are six major ad types in Google Ads, each with different cost structures and effectiveness.
1. Search ads (listing ads)
Text ads displayed at the top and bottom of Google search results. This is the most popular ad type.
- Pricing model: Cost-per-click (CPC)
- Average CPC: ¥50–¥500
- Best suited for: Acquiring high-intent audiences, driving direct conversions
- Minimum budget: From ¥100,000/month
2. Display ads
Ads displayed across banner ad placements on Google partner sites (over 2 million sites).
- Pricing model: Cost-per-click (CPC) or cost-per-thousand-impressions (CPM)
- Average CPC: ¥10–¥100
- Best suited for: Expanding brand awareness, remarketing
- Minimum budget: From ¥50,000/month
3. YouTube ads (video ads)
Video ads displayed within YouTube, such as TrueView InStream and bumper ads.
- Pricing model: Cost-per-view (CPV) or CPM
- Average CPV: ¥3–¥20 per view
- Best suited for: Brand awareness, engagement
- Minimum budget: From ¥50,000/month
4. Shopping ads
For e-commerce businesses. Displays product images, prices, and store names in Google search results.
- Pricing model: Cost-per-click (CPC)
- Average CPC: ¥20–¥200
- Best suited for: Driving e-commerce site sales
- Required: Merchant Center setup
5. App campaigns
Ads that promote mobile app installations.
- Pricing model: Cost-per-install (CPI) or target-based
- Average CPI: ¥100–¥500
- Best suited for: Acquiring app users
6. Performance Max (P-Max) campaigns
Integrated campaigns where AI automatically optimizes across all ad placements (Search, Display, YouTube, Discover, etc.). As of 2026, it is spreading rapidly.
- Pricing model: Conversion-focused automated optimization
- Best suited for: Businesses with clear conversion targets
- Minimum budget: From ¥300,000/month (to secure sufficient learning data)
How to determine your monthly budget | 3 steps
Step 1: Determine target conversions and target CPA
月額広告費 = 目標CV数 × 目標CPAIndustry benchmarks for target CPA (2026):
- B2C e-commerce: ¥1,000–¥5,000
- B2C service bookings: ¥3,000–¥10,000
- B2B lead generation: ¥20,000–¥80,000
- Legal/professional services and consulting: ¥50,000–¥200,000
- Real estate and healthcare: ¥30,000–¥150,000
Step 2: Calculate average CPC and expected clicks
想定クリック数 = 月額広告費 ÷ 平均CPCExample: ¥300,000/month ÷ average CPC of ¥300 = 1,000 clicks/month
Step 3: Check the expected CVR (conversion rate)
想定CV数 = 想定クリック数 × 想定CVRAverage CVR by industry:
- BtoC EC: 1〜3%
- B2B lead generation: 2%–5%
- Legal/professional services and consulting: 3%–8%
- Real estate and healthcare: 1%–4%
Calculation example: 1,000 clicks/month × 3% CVR = 30 conversions/month
Check whether this figure meets your goal; if it falls short, consider increasing the budget or improving CVR (such as by revamping landing pages).
Decision criteria: Agency outsourcing vs. in-house management
| Condition | Recommendation |
|---|---|
| Monthly ad spend under ¥100,000 | In-house management |
| Monthly ad spend ¥100,000–¥300,000 | In-house management or flat-rate agency |
| Monthly ad spend ¥300,000 or more | Percentage-fee agency (15%–20%) |
| No experienced ad managers on staff | Agency (initial setup is critical) |
| Want to run across multiple ad networks simultaneously | Agency (requires substantial labor) |
Cost breakdown when outsourcing to an agency
Example with monthly ad spend of ¥300,000:
| Item | Amount |
|---|---|
| Ad spend (actual media cost) | ¥300,000 |
| Management fee (20%) | ¥60,000 |
| Initial setup fee (first month only) | ¥150,000 |
| First-month total | ¥510,000 |
| From the second month onward | ¥360,000/month |
7 tips to boost cost-effectiveness with Google Ads
1. Maximize Quality Score
In Google Ads, a higher Quality Score allows your ad to rank higher even with the same bid. The three factors that determine Quality Score are:
- Ad relevance to keywords
- LP (landing page) quality
- Expected click-through rate
Aiming for a Quality Score of 8 or above out of 10 can reduce CPC by 30% to 50%.
2. Thoroughly configure negative keywords
Prevent ads from appearing on irrelevant search queries. For example, if you offer a paid service, add "free" or "complimentary" as negative keywords.
3. Narrow down locations, devices, and schedules
Concentrate ad delivery on the conditions where conversions occur. For example, in B2B, simply narrowing delivery to "weekdays 9:00–18:00" and "Tokyo, Osaka, Nagoya" can cut CPA in half.
4. Properly configure conversion tracking
Rather than relying on Google Ads alone, tracking conversions in integration with GA4 is essential. Without accurate conversion tracking, machine learning optimization cannot function properly, leading to wasted budget.
5. Leverage remarketing
A tactic to re-engage users who have visited your site before. It typically yields a CVR 2 to 5 times higher than standard display advertising.
6. Run continuous A/B tests
Continuously A/B test ad copy and landing pages to keep improving click-through and conversion rates. Google's Responsive Search Ads (RSA) automatically conduct A/B testing for you.
7. Utilize Performance Max appropriately
In Google Ads as of 2026, P-Max has become mainstream. However, note that because initial data is required during the learning period (typically 2 to 4 weeks), learning will not progress smoothly without a budget of ¥300,000/month or more.
Frequently asked questions (FAQ)
Q. What is the minimum budget required to start Google Ads?
A. In theory, you can start from as little as ¥1,000 per month, but realistically we recommend starting from ¥50,000 to ¥100,000 per month. Below this level, you cannot gather statistically significant data, making it impossible to run effective PDCA cycles.
Q. Which is more effective, Google Ads or Yahoo Ads?
A. Based on search market share, feature depth, and available learning resources, it is most efficient to start with Google Ads first. Consider Yahoo Ads as an additional channel after seeing results with Google Ads.
Q. Should we use "Smart Bidding" to automatically optimize budgets?
A. If your ad spend is ¥300,000/month or more, you should actively use it. Optimization via machine learning can improve ROI by 20% to 40% compared to manual management. However, this presupposes that conversion tracking is properly configured.
Q. How many ad copy variations should we prepare?
A. With Google's Responsive Search Ads (RSA), the maximum limits are 15 headlines and 4 descriptions. Preparing at least 10 headlines and 3 descriptions maximizes the effectiveness of automated optimization.
Q. What causes clicks not turning into inquiries?
A. The three main causes are as follows:
- Mismatch between ad copy and landing page content: Failing to meet user expectations
- Weak above-the-fold content on the landing page: Failing to convey value within 3 seconds
- The form is too long: Minimize input fields
For details, see Key Improvement Points to Double CVR with Entry Form Optimization (EFO).
Q. What is the difference between a 15% and a 20% agency fee rate?
A. Generally, 15% covers "ad management only (including reporting)," while 20% covers "ad management + creative production + landing page improvement recommendations." As a benchmark, choose 20% if monthly ad spend is ¥300,000 or more, and 15% if below that.
Summary: Clarify your goals and spend your budget wisely
Google Ads is an advertising channel where results are determined by the quality of management rather than budget size. When managed appropriately, even a ¥100,000/month budget can yield a lower CPA than an unplanned ¥1,000,000/month campaign.
Before getting started, organize the following:
- Objective: Inquiry generation, e-commerce sales, or brand awareness
- Target conversions: How many results are needed per month
- Target CPA: How much you can afford to pay per conversion
- Ad type: Search / Display / YouTube / Shopping
- Management structure: In-house or agency
Deciding these five points before launching your ads will substantially reduce the risk of failure.
Related articles
- Listing Advertising Cost Guide | Monthly Budgets and Agency Fee Benchmarks — Detailed cost benchmark breakdown
- How to Get Started with Listing Ads: Setup Guide to Driving Results from ¥50,000/Month — Specific setup steps
- Online Customer Acquisition Strategies for SMBs: Ads, SEO, or Social Media—Where Should You Start? — Organizing your overall strategy
30-minute free consultation — We'll share an ad management plan tailored to you
If you are interested in Google Ads but unsure if it fits your business, please take advantage of our 30-minute free consultation.
- Ad type recommendations tailored to your business model
- Budget calculations backwards-engineered from your target conversions
- Decision support for choosing between in-house management and agency outsourcing
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