Welcome, Hunters.
Thanks for taking the time to check out CalcNest AI. Here's the honest story of what we built, why, and what's actually under the hood.
The honest backstory
I built CalcNest AI because I kept hitting the same wall. Every time I wanted to run a specific calculation — yield farming APR, BRRRR cash-on-cash return, AI inference cost for my chatbot, the right dog food portion for my pet — the existing tools either didn't exist, hid the math behind a signup wall, or surrounded the result with so many ads I couldn't read it.
So I started building. One calculator at a time. The goal was simple: a free library where every formula is documented, every result is instant, and your numbers never leave your browser.
456 calculators later, here we are.
What makes CalcNest AI different
- Niche coverage you can't find elsewhere. 153 specialty calculators including AI inference cost across providers, yield farming APR, impermanent loss, BRRRR real estate analysis, carnivore diet macros, HVAC tonnage, drywall material estimation, and 30 dedicated pet calculators (dog food portion, aquarium volume, pet medication dosing).
- AI Finder — describe what you need in plain English and the right calculator surfaces. No keyword guessing. Try: "how much should I save for retirement" or "is yield farming worth the impermanent loss risk."
- AI Concierge — multi-step planning scenarios where values flow automatically between calculators. Map out a complete retirement plan, a real estate investment thesis, or an AI product cost model in one guided flow.
- Privacy-first by design. Every calculation runs in your browser. We have no server that stores your inputs. No account required. No tracking pixels beyond standard analytics. Your salary, weight, portfolio — they stay on your device.
- Math sourced from peer-reviewed standards. Finance uses textbook formulas (Brealey-Myers, Bodie-Kane-Marcus). Health uses CDC/WHO/clinical formulas (Mifflin-St Jeor for BMR, ACOG for pregnancy). Pet nutrition follows AAFCO. Construction follows ASHRAE/NEC. Full methodology here.
- Six in-depth blog analyses on topics with named frameworks: the true lifetime cost of smoking (LCC), why the 4% retirement rule needs updating (LAWF), real estate screening (Five-Formula Framework), AI API cost engineering (CPUO), and more. Not SEO filler — actual original analysis.
- Free for embedding. 20 of our calculators are available as iframe embeds you can drop into your own site. See the embed library.
Pricing
Free. No tiers, no premium upsell, no paywall. The site sustains itself via Google AdSense display ads (positioned out of the way of results) and the occasional disclosed affiliate link where genuinely relevant to a calculator.
If you find CalcNest AI useful, the best way to support it is to actually use it — and tell one friend who'd benefit. That's it.
Built solo, transparently
This is a one-person project. I'm Madhavi (hello.goledigitalstudio@gmail.com) and I'm building this in public. Every calculator, every blog post, every line of code reviewed by a human before it ships. AI helps with first drafts and code scaffolding, but the editorial decisions are mine.
If you spot a math error, find a calculator missing, or want to suggest something — I read every email and respond to substantive feedback within seven days.
What's next
The roadmap is public-ish. The next 6 months: mobile speed improvements, affiliate partnerships (only where genuinely useful), more pet calculators, a metric/imperial unit toggle so non-US users don't have to convert (current state is US imperial: lb, inches, °F, gallons), and a research section that makes our analytical frameworks easier to cite.
If any of those resonate, please leave a comment on the Product Hunt launch — that's where I'll see your input fastest today.
Three calculators I'd start with
- FIRE Number Calculator — most people massively underestimate what financial independence actually costs. This shows the math.
- AI Inference Cost Calculator — compare GPT, Claude, and Gemini token costs for your actual use case. Surprisingly useful for cost engineering.
- AI Finder — type any calculation question in plain English and watch the right tool surface. The most "wow" feature on the site.
Used CalcNest? Help others find it
Thanks for stopping by. Whether you upvote or not, I hope you find a calculator that genuinely helps you today.