Accurately forecasting a Google Ads budget is a critical task for any PPC specialist. Our calculator helps you predict campaign costs based on real data from Google Keyword Planner, so you can plan effectively before launching.
What is a PPC Budget Calculator?
A PPC Budget Calculator is a planning tool that estimates your advertising spend based on keyword data. By analyzing search volumes, competition levels, and cost-per-click (CPC) rates, it predicts how much budget you'll need to achieve your marketing goals. This tool is essential for agencies, freelancers, and in-house teams looking to present data-driven projections to clients or stakeholders.
How Does Budget Forecasting Work?
The forecasting process follows a simple formula: we take your total keyword search volume, multiply by your expected Impression Share (IS), then by Click-Through Rate (CTR) to get predicted clicks. Multiplying clicks by average CPC gives you the base budget. Add VAT if applicable, and you have your forecast. Our calculator also projects conversions based on your Conversion Rate (CR) and calculates ROMI to show campaign viability.
Budget = Volume × IS × CTR × Avg CPC × (1 + VAT%)Key Metrics Explained
Impression Share (IS) — the percentage of available impressions your ads will capture. Higher IS means more visibility but also higher costs.
Click-Through Rate (CTR) — the percentage of impressions that result in clicks. Industry average is 2-5% for search ads.
Conversion Rate (CR) — the percentage of clicks that become conversions (leads, sales). Typical e-commerce CR is 1-3%.
Cost Per Click (CPC) — the average amount you pay for each click. Varies by industry and competition.
Return on Marketing Investment (ROMI) — shows profitability: (Revenue - Cost) / Cost × 100%.
How to Use This Tool
Export keyword data from Google Keyword Planner as XLSX file
Upload the file and map columns if needed
Adjust settings: IS, CTR, CR, Average Order Value, and VAT
Review projected budget, clicks, leads, and ROMI
Optionally upload a Google Ads report to compare forecast vs actual performance
Frequently Asked Questions
How accurate is the budget forecast?
Accuracy depends on the quality of your input data. Using real Google Keyword Planner data with realistic IS/CTR/CR settings typically yields 80-90% accuracy compared to actual campaign spend.
What file format should I use?
For keyword data, use XLSX files exported from Google Keyword Planner. For comparison reports, use CSV or TSV exports from Google Ads.
Can I use this for any industry?
Yes! The calculator works with any keyword data. Just adjust your CR and Average Order Value based on your industry benchmarks.
Industry Analytics 2025-2026
Industry sectors in Google Ads are usually counted for analytics (benchmarks). Most major reports distinguish between 20 and 25 main sectors.
Business Services (B2B)
Lawyers, marketing, IT consulting.
Consumer Services (B2C)
Beauty salons, cleaning, repairs (your niche).
Other Major Sectors
Finance, Real Estate, Healthcare, Education, Auto, E-commerce.
The Math of One Conversion
How many views do you need for a result?
To get 1 conversion:
Important: For local businesses (like shoe repair), numbers can be better because clients search 'here and now'.
Glossary & Formulas
Decoding all abbreviations and their calculation formulas.
CTR (Click-Through Rate)
Click-through rate of ad
CR / CVR (Conversion Rate)
Conversion Rate (percentage of visitors who became customers)
CPC (Cost Per Click)
Cost per click
CPA / CPL (Cost Per Action / Lead)
Cost per action or lead
ROAS (Return on Ad Spend)
Return on ad spend
ROMI (Return on Marketing Investment)
Return on marketing investment
IS (Impression Share)
Impression share
AOV (Average Order Value)
Average Order Value (average amount spent per order)
Margin (Margin)
Profit margin percentage
ROI (Return on Investment)
Return on Investment (profit generated vs cost)
VAT (Value Added Tax)
Tax added to advertising budget