About CostZap
CostZap is a growing collection of free online calculators and tools for business, finance, marketing, and SEO. Our mission is simple: make powerful, accurate tools accessible to everyone — no paywalls, no signups, no limits.
Whether you're splitting a dinner bill, working out a loan payment, pricing a product, estimating your first AdSense paycheck, or fine-tuning a title tag for search, CostZap gives you a fast, reliable answer in seconds.
Why We Built CostZap
We kept finding ourselves jumping between spreadsheets, browser tabs, and half-broken websites just to answer simple questions: What's 18% of this bill? How much will this loan cost me? What's my real profit margin? How much could I earn at 100,000 page views? Will my title tag get cut off in search results?
None of the existing tools quite hit the mark — they were either behind a paywall, cluttered with ads, required a signup, or simply gave inaccurate results. So we built our own. CostZap started as a small set of calculators and grew into a full platform of everyday calculators, business and marketing tools, revenue estimators, and SEO utilities.
Today CostZap covers everything from quick percentage math and loan payments to ad revenue estimation, profit margins, and technical SEO — all in one place, all free.
What We Offer
Everyday Calculators
Free, no-fuss calculators for the quick math that comes up every day — at the store, at a restaurant, or at your desk:
- Standard Calculator — A clean online calculator for everyday addition, subtraction, multiplication, and division, with keyboard support.
- Percentage Calculator — Find percent of a number, what percent one number is of another, and percentage change.
- Discount Calculator — Work out the sale price and exactly how much you save, including stacked discounts.
- Sales Tax Calculator — Add tax to a price or reverse it out of a tax-inclusive total.
- Tip Calculator — Calculate the tip, total, and per-person amount when splitting a bill.
- BMI Calculator — Find your Body Mass Index and healthy weight range in metric or imperial units.
- Age Calculator — Calculate your exact age in years, months, and days, plus your next birthday.
- Loan & EMI Calculator — Estimate monthly payments and total interest for loans and mortgages.
Revenue & Ad Calculators
Estimate earnings across every major monetization platform — from display advertising to video and social:
- AdSense Calculator — Estimate Google AdSense earnings from page views, CTR, and CPC. Plan your revenue targets before you hit publish.
- YouTube Money Calculator — Calculate YouTube earnings from views and CPM. Accounts for YouTube's 55% revenue share to give you your actual take-home.
- Ezoic Calculator — Estimate Ezoic EPMV revenue for any traffic level. Compare how Ezoic performs against your current network.
- Mediavine Calculator — See how much you could earn on Mediavine. Includes niche-specific RPM presets and an AdSense comparison.
- CPC Calculator — Solve for cost per click, total spend, or number of clicks with two inputs.
- CPM Calculator — Calculate cost per thousand impressions for display ad campaigns.
- RPM Calculator — Calculate revenue per mille and project monthly or annual earnings from any traffic volume.
- Website Worth Calculator — Estimate the market value of any website based on monthly revenue, traffic, and domain age.
Business & Marketing Calculators
Tools for pricing, campaigns, and growth decisions, whether you're running a store or a marketing budget:
SEO & Content Tools
Our SEO tools cover the full optimization workflow, from technical markup to content analysis:
- Meta Tag Generator — Generate complete HTML meta tags including title, description, Open Graph, and Twitter Cards in one click.
- Keyword Density Checker — Analyze keyword frequency and TF-IDF scores to avoid over-optimization.
- Open Graph Generator — Build OG tags for better social media sharing previews on Facebook, LinkedIn, and WhatsApp.
- Robots.txt Generator — Create a properly formatted robots.txt file to control crawler access to your site.
- Word Counter — Count words, characters, sentences, paragraphs, and reading time instantly.
- SERP Preview — Preview how your page title, URL, and description will appear in Google search results on desktop and mobile.
- Slug Generator — Convert any title into a clean, SEO-friendly URL slug with stop word removal and length limiting.
- Schema Markup Generator — Generate JSON-LD structured data for Articles, FAQs, How-Tos, Local Businesses, Products, and Breadcrumbs.
- UTM Link Builder — Build UTM-tagged campaign URLs for accurate Google Analytics tracking.
- Lorem Ipsum Generator — Generate placeholder text by paragraphs, sentences, or words for mockups and prototypes.
- Readability Checker — Score your content with Flesch-Kincaid and other readability formulas, plus keyword density analysis.
Our Values
Free Forever
Every tool on CostZap is completely free to use. There are no premium tiers, no feature locks, and no credit card required. We believe the best tools should be available to everyone — not just those who can afford a subscription.
Privacy First
All calculations happen entirely within your browser. When you type a number into our AdSense calculator or paste text into our keyword density checker, that data never leaves your device. We don't log your inputs, and we don't store your results. What you calculate stays yours.
Accuracy You Can Trust
Our calculators use industry-standard formulas and regularly updated benchmarks. We cite our sources, explain our methodology, and flag where estimates are exactly that — estimates. We'd rather give you an honest range than a falsely precise number.
Fast and Focused
We designed CostZap to be as fast as possible. Tools load instantly, calculations happen in milliseconds, and there's no unnecessary complexity. Every feature on the page earns its place.
Constantly Improving
We actively maintain and expand CostZap based on user feedback and changes in the digital marketing landscape. When Google updates its algorithm, when ad network rates shift, when new platforms emerge — we update our tools to keep up.
Who Uses CostZap?
CostZap is built for anyone who creates content, runs a website, or works in digital marketing:
- Bloggers and content creators who want to understand their earning potential and optimize their content for search.
- YouTube creators estimating how much their channel could earn at different subscriber and view levels.
- Digital marketers tracking campaign performance, building UTM links, and running A/B tests.
- SEO professionals generating schema markup, previewing SERP snippets, and checking keyword density.
- Web developers building sites and needing quick access to meta tag generators, lorem ipsum, and slug tools.
- Small business owners exploring online advertising and wanting to understand CPC, CPM, and ROI before committing budget.
- Students and researchers learning how online monetization, search engines, and digital marketing work.
Our Blog
The CostZap blog publishes in-depth guides, data-backed articles, and actionable tips on SEO, monetization, and web development. Recent topics include:
Get in Touch
We love hearing from our users. Whether you've spotted a bug, have an idea for a new tool, or just want to say hello — we're all ears.
We typically respond within 1-2 business days.