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Every number a marketer argues about in a meeting, worked out in seconds — paid media economics, SEO diagnostics, and the generators that save an afternoon of fiddling.

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A/B Test Calculator Check if your split test winner is statistically significant with a real z-test. ARR Calculator Convert MRR to ARR and project your growth trajectory with churn, plus months to a target ARR. Ad Budget & ROAS Calculator Forecast clicks, conversions, revenue and ROAS from any ad budget — free tool. Ad Frequency Calculator Turn impressions and reach into average frequency, weekly frequency and fatigue risk. AdSense Revenue Calculator Estimate monthly and annual AdSense revenue by niche, geography, and traffic. Anchor Text Generator Generate a balanced mix of branded, exact-match, partial-match, and natural anchor text. Anchor Text Ratio Calculator Break a backlink profile into anchor types and flag distributions that look engineered. Attribution Model Comparison Calculator See how four attribution models credit the same conversions to different channels. Audience Reach Calculator Stack targeting filters against a market to find your reachable audience size. Backlink Value Calculator Estimate the referral and authority value of a single backlink in your own currency. Blog Title Generator Turn any topic into 15-25 click-worthy blog titles using proven headline formulas. Bounce Rate Calculator Calculate email bounce rate (hard/soft) or website bounce rate — pick your mode. Brand Search Share Calculator Split search demand into branded and non-branded and size your share of brand search. Break-Even Units Calculator Find how many units you need to sell monthly to break even or hit a profit target. Business Name Generator Generate dozens of business name ideas from your keywords in Modern, Classic, Playful, or Premium styles. CPA Calculator Calculate campaign-level cost per acquisition from ad spend and conversions, and check it against target CPA. CPC Calculator Calculate cost per click directly, or the effective CPC hiding inside a CPM campaign. CPM Calculator Calculate CPM, impressions bought for a budget, and estimated reach for awareness campaigns. CTR Calculator Calculate click-through rate, compare to benchmark, and see the extra clicks a better CTR is worth. CTR Improvement Calculator See how many extra clicks and revenue a better click-through rate produces on your existing impressions. Churn Rate Calculator Calculate monthly customer churn, revenue churn, customer lifetime, and net revenue retention. Content Decay Calculator Measure how fast a page is losing traffic and whether a refresh is worth the time. Content Gap Calculator Compare your topics against competitors and rank the gap by volume and difficulty. Content Marketing ROI Calculator Model how your content library compounds traffic and revenue over its full lifespan. Conversion Rate Calculator Calculate your conversion rate, revenue and value per visitor — free and instant. Core Web Vitals Score Calculator Grade LCP, INP, and CLS against Google's thresholds and get one weighted score. Cost Per Lead Calculator Calculate cost per lead and see the true cost per customer once conversion rate is factored in. Crawl Budget Calculator See how long a full crawl of your site takes and how much of it is wasted. Customer Acquisition Cost Calculator Calculate your true, fully-loaded CAC including salaries, tools, and agency fees — not just ad spend. Customer Lifetime Value Calculator Free CLV calculator: find a customer's lifetime profit, revenue and annual value instantly. Discount Percentage Calculator Find the discount % or original price, and see how a discount affects your profit margin. Domain Authority Checker Estimate your site's authority signals from links, age, spam score, and brand search. Email List Growth Calculator Project your email list's real growth after subtracting unsubscribes and bounces. Email Marketing ROI Calculator Calculate email campaign revenue, profit and ROI instantly — free marketing tool. Email Open Rate Calculator Calculate your email open rate and compare it against real industry benchmarks in seconds. Email Signature Generator Build a professional HTML email signature for Gmail or Outlook in seconds — free, no software needed. Email Subject Line Tester Score your subject line for length, spam words, emoji, and mobile truncation instantly. Engagement Rate Calculator See your true engagement rate by followers, reach, and impressions side by side. FAQ Schema Generator Turn your questions and answers into valid FAQPage JSON-LD structured data. Facebook Ads Character Counter See live where your Meta primary text, headline, and description get cut off. Flesch Reading Ease Calculator Calculate the exact Flesch Reading Ease score and Flesch-Kincaid Grade Level for any text, live. Free URL Slug Generator Turn any title into a clean, SEO-friendly URL slug in one click. GMB Optimization Score Calculator Audit your Google Business Profile field by field and get a completeness score. Google Ads Character Counter Live character counter for Google Ads headlines, descriptions, business name, and display paths. Google Cache Checker Generate one-click links to check if a page is indexed now that Google's cache: operator is gone. Gross Margin Calculator Calculate gross margin %, gross profit per unit, and the price needed to hit a target margin. Hashtag Generator Generate a mixed, platform-sized hashtag set for Instagram, TikTok, LinkedIn, X, or YouTube. Headline Analyzer Score any headline on length, power words, emotion, and structure before you publish. Htaccess Redirect Generator Generate safe .htaccess redirect rules for 301s, 302s, HTTPS, www, domains, and bulk migrations. Image Alt Text Generator Build clear, keyword-smart, accessibility-friendly alt text for any image. Impression Share Calculator Calculate impression share and split the lost share between rank and budget. Incrementality Test Calculator Compare a test group with a holdout to find incremental conversions and true CPA. Influencer Rate Calculator Estimate a fair influencer rate by followers, engagement, content type, and usage rights. Instagram Engagement Calculator Calculate your Instagram engagement rate by followers and reach, benchmarked by follower tier. Internal Link Opportunity Calculator Work out how many internal links your site is missing and which pages need them most. Invoice Generator Build a professional invoice with a live preview, then print or save it as a PDF. Keyword Cannibalization Checker Find keywords targeted by more than one page and score how serious each conflict is. Keyword Cluster Generator Paste a keyword list and get topic clusters with a suggested pillar page for each. Keyword Density Checker Instantly check keyword density and catch keyword stuffing before you publish. Keyword Difficulty Checker Estimate how hard a keyword is to rank for using the SERP signals you observe. Keyword Intent Classifier Sort keywords into informational, commercial, transactional and navigational intent. LSI Keyword Generator Generate related questions, modifiers and long-tail variants from any seed keyword. LTV:CAC Ratio Calculator Calculate your LTV:CAC ratio and get an instant verdict on whether your growth engine is healthy. Landing Page Conversion Calculator Model the extra monthly and yearly revenue from improving your landing page conversion rate. Lead Conversion Calculator Break your funnel into stages and find the weakest link from visitor to closed customer. Letterhead Generator Design a print-ready company letterhead with your logo, header, and footer, then print or save as PDF. Link Velocity Calculator Measure how fast your referring domains grow and compare the pace to a competitor. Local SEO Ranking Calculator Score your map-pack visibility across relevance, distance and prominence with your weights. MRR Calculator Build your MRR waterfall: new, expansion, reactivation, contraction, churn, growth rate & quick ratio. Marketing Budget Calculator Turn a percent-of-revenue rule into a full channel-by-channel marketing budget. Marketing ROI Calculator Free marketing ROI calculator: get ROI %, net profit, ROAS and cost per customer fast. Markup Calculator Turn unit cost and markup % into a selling price, profit, and the equivalent gross margin. Media Mix Allocation Calculator Reallocate a fixed budget across four channels using each channel's cost per acquisition. Meta Description Length Checker Check meta description length by real pixel width, not just characters, with a live Google SERP preview. Meta Tag Generator Generate clean SEO, Open Graph and Twitter Card meta tags to paste into your page head. Minimum Detectable Effect Calculator Find the smallest lift your sample size can detect before you run the test. NPS Calculator Calculate your Net Promoter Score from promoter, passive, and detractor counts. Net Profit Margin Calculator See gross, operating, and net margin side by side to find exactly where profit is leaking. Open Graph Generator Generate og:title, og:image, and full Open Graph meta tags with a live preview card. PPC ROI Calculator Calculate real PPC return after ad spend, margin, and management fees. Packing Slip Generator Create a clean, itemized packing slip with no prices — ship-from, ship-to, and quantities, ready to print. Payback Period Calculator Find out how many months until a marketing spend or investment pays for itself. Product Pricing Calculator Find the selling price that hits your target margin after payment and marketplace fees. Quality Score Calculator Estimate your Google Ads Quality Score and see the cost per click it implies. Quote Generator Build a professional sales quote or estimate with a live preview, then print or save as a PDF. ROAS Calculator Calculate gross ROAS, profit ROAS, and the break-even ROAS your margin actually requires. Readability Checker Score your text's Flesch reading ease and grade level instantly. Receipt Generator Create a professional payment receipt with a live preview, then print or save it as a PDF. Revenue Forecast Calculator Project revenue forward with growth rate, churn, and seasonality — see month 12 today. Robots.txt Generator Build a valid robots.txt with WordPress/ecommerce presets and AI crawler blocking, then copy it instantly. SEO Audit Score Calculator Turn six pillar scores into one weighted SEO audit score with every weight editable. SEO Content Length Checker Live word count checker that compares your draft against ranking benchmarks by content type. SEO ROI Calculator Model SEO's delayed, compounding return and find your true break-even month. SEO Traffic Forecast Calculator Forecast sessions, conversions, and value from a change in ranking position. SERP Feature Opportunity Calculator Model how much click-through rate the features above the organic results absorb. SERP Snippet Preview Preview how your title and meta description appear in Google, with pixel-accurate width. SERP Volatility Calculator Turn a before-and-after ranking list into a volatility score for your own keywords. SaaS Metrics Calculator Get ARPA, ARR, churn, LTV, CAC, LTV:CAC, payback & gross margin in one health dashboard. Sales Commission Calculator Calculate commission across flat, tiered, base+commission, and margin-based structures. Sales Growth Calculator Calculate real sales growth, annualized rate, and what's needed to hit your next target. Sample Size Calculator Find out how many visitors per variant your A/B test needs before you launch it. Schema Markup Generator Generate valid JSON-LD schema markup for LocalBusiness, Article, Product, and more. Share of Voice Calculator Measure your share of category impressions and spend, and price a higher share. Site Migration Risk Calculator Score a planned migration on URL change, redirects, templates, platform and timing. Social Media Engagement Calculator Compare engagement rates across Instagram, Facebook, LinkedIn and X to find your best platform. TikTok Money Calculator Estimate monthly TikTok earnings from Creator Rewards Program payouts and brand deals. Title Tag Length Checker Check title tag length by real pixel width against Google's ~600px limit, with a live SERP preview. Topical Authority Calculator Score your coverage of a topic against a competitor and size the gap in subtopics. Traffic Value Calculator See what your organic traffic would cost to buy on Google Ads — the number that justifies your SEO budget. Twitter Card Generator Generate twitter:card meta tags for summary, large image, player, and app cards. UTM Builder Build trackable UTM campaign URLs for Google Analytics in seconds — free & private. UTM Grader Paste a UTM link and get an instant grade for missing parameters, case mismatches, and encoding issues. Video Completion Rate Calculator Turn quartile view counts into completion rate, drop-off points and cost per view. Webinar ROI Calculator Calculate real webinar ROI from registrations through show-up rate to closed customers. Website Word Count Count words from plain text or raw HTML, with reading and speaking time estimates. Wholesale Price Calculator Calculate wholesale price, suggested retail price, and margins across the keystone pricing chain. XML Sitemap Generator Paste URLs and instantly generate a valid, standards-compliant XML sitemap ready to upload and submit. YouTube Money Calculator Estimate monthly and annual YouTube ad revenue by niche, RPM and audience location. 📄 Purchase Order Generator Build a professional purchase order with live totals and print or save it as a PDF instantly. 🧠 Marketing Quiz Take the 1-minute marketing quiz and find your marketing personality type.

What is in this set

The paid-media calculators answer the questions a dashboard will not: what your break-even ROAS actually is at your margin, what a click is worth before you bid on it, and whether a lift you measured is real or noise. The SEO tools go the other way — they take a page or a profile you already have and tell you what is wrong with it, from keyword cannibalisation to anchor-text distribution to crawl budget waste.

Why the numbers here differ from your ad platform

Ad platforms report ROAS from raw revenue and raw spend because they cannot see your cost of goods. A 4x return looks excellent until you subtract a 75% product cost, at which point it is exactly break-even. Several of these tools ask for margin precisely so the answer reflects your business rather than the platform's view of it.

Where the modelled numbers are flagged

Google publishes no formula for Quality Score, no composite for Core Web Vitals, and no target anchor-text ratio. Where a tool here scores something Google does not publish, the weighting is an Arb Digital model, it is stated on the page, and the inputs are editable so you can substitute your own assumptions.

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