Five free marketing calculators for B2B SaaS founders, packaged as a cross-browser extension. SEO ROI, Automation Savings, CAC + LTV, A/B sample size, SaaS pricing → ARR forecast. No sign-up, no telemetry, EN+RU.
Website · B2B SaaS SEO · Workflow Automation · Free SEO Audit
Five calculators built from spreadsheets our team kept rebuilding for client engagements at Global One Digital. Packaging them into a browser extension made the work reusable.
Project monthly organic visits, leads, deals, revenue, break-even month, and 12-month ROI from your B2B SEO investment. Uses Advanced Web Ranking 2024 click-through-rate data per position with a realistic 12-month ramp curve — month 1 delivers ~5% of steady state, rising to 100% by month 12.
Useful before signing an SEO retainer or building an internal SEO program.
Calculate hours freed per month, monthly labor + error-cost savings, payback period, and 3-year net savings from automating a workflow. Conservatively models 95% labor automation and 92% error reduction.
Useful when scoping n8n, Make, Zapier, or custom automation builds.
Customer acquisition cost, lifetime value, LTV:CAC ratio, payback months, plus a letter grade (A through D) based on standard SaaS health benchmarks. A = ratio ≥ 5, B = 3-5, C = 1.5-3, D = under 1.5.
Two-proportion z-test sample size based on baseline conversion rate, minimum detectable effect, confidence level, and statistical power. Same math used by Optimizely, VWO, and Convert. Outputs sample size per variant and days/weeks to significance at your current traffic.
Set Starter / Growth / Enterprise tier prices and customer mix, then project ARPU, MRR after 12 months, ARR after 12 and 36 months with month-by-month churn modeling. Exponential retention math — not the lazy "annual revenue × growth multiplier" approximation.
Choose your browser:
| Browser | Store |
|---|---|
| Chrome / Brave / Arc / Vivaldi | Chrome Web Store |
| Firefox / Tor Browser | Firefox AMO |
| Microsoft Edge | Edge Add-ons |
| Opera | Opera Add-ons |
Or sideload locally:
git clone https://github.com/GlobalOneDigital/growth-math.git
cd growth-math
# Chrome / Edge / Opera:
# 1. Navigate to chrome://extensions, opera://extensions, or edge://extensions
# 2. Toggle Developer Mode
# 3. Click "Load unpacked", select the cloned directory
# Firefox:
# 1. Navigate to about:debugging#/runtime/this-firefox
# 2. Click "Load Temporary Add-on..." → select manifest.jsonThree reasons:
-
Our team kept rebuilding the same five spreadsheets across client engagements at Global One Digital. Packaging them as a browser extension made the work reusable and gave clients a tool they could check anytime without contacting us.
-
B2B SaaS founders need quick math, not full apps. A popup that opens in one click is faster than a tab, doesn't need an account, and doesn't put sensitive revenue numbers into a third-party SaaS.
-
As a free open-source-style asset it lets us share methodology without paywalls. The math formulas are commented inline in
popup.js.
No data leaves your browser. No analytics. No telemetry. No tracking pixels. No third-party requests at runtime. We do not collect, store, or transmit any input data.
The only thing we save locally (via chrome.storage.local) is your
language preference — one string, either "en" or "ru". Inputs are
not saved; close the popup, the numbers are gone.
Permissions requested:
storage— only for saving your EN/RU language preference
No remote code, no API calls, no content scripts. Verify in
chrome://extensions with developer mode on.
See full privacy policy.
English (primary) and Russian — auto-detected from browser locale
and switchable in the popup. Result number formatting also follows the
selected locale (US 1,234 vs RU 1 234).
Each calculator uses well-known industry formulas, commented inline in
popup.js:
- SEO ROI — CTR-by-position from Advanced Web Ranking 2024 study, 12-month ramp curve based on observed SaaS organic growth patterns
- A/B Sample Size — standard two-proportion z-test formula, same math used by Optimizely / VWO / Convert
- CAC / LTV — classic SaaS health benchmarks (LTV:CAC > 3 = healthy, payback < 12 mo = healthy)
- Automation — conservative 95% labor + 92% error reduction (full elimination is rare in real engagements)
- SaaS Pricing — month-by-month MRR simulation with exponential
retention (
mrr = mrr × (1 - churn) + new_mrr_per_month)
We are a B2B SEO and automation agency working with Series A through Series C SaaS companies in the US and EU.
- development-web.com — Homepage
- B2B SaaS SEO services
- Business process automation
- n8n consulting
- LLM integration agency
- Free B2B SEO audit
- Blog
- Contact
Planned for future versions:
- Sales velocity calculator (deal size × opportunities × win rate / sales cycle)
- Content production budget planner
- Public-data keyword volume estimator (Wordstat-style)
- Browser-action quick-input (no popup, direct keyboard input)
- Export to Notion / Slack one-click integrations
Have a calculator you keep rebuilding in spreadsheets that fits this B2B SaaS toolkit theme? Open an issue or contact us — that's exactly how this extension started.
Proprietary © Global One Digital. The source code is provided for inspection and self-installation only. Redistribution, modification for commercial purposes, or rebranding without permission is not licensed.
See LICENSE for full text.
browser-extension chrome-extension firefox-addon marketing-calculator
b2b-saas saas-metrics cac-ltv seo-roi ab-testing automation-savings
pricing-strategy arr-forecast growth-marketing revops growth-tools