Practical calculators with methods you can inspect.
Use the site for AI pricing, housing, solar planning, azimuth checks, and everyday math, with review dates, source links, and clear limits.
Featured calculators
The strongest pages on the site pair a working calculator with a clear method, assumptions, and related guidance. For lighter utility math, start from the math hub instead of treating each page like a standalone reference.
AI Cost
Estimate model spend, token costs, and monthly usage.
Affordability
See how much house fits your income and debts.
Mortgage
Calculate monthly payment with taxes, insurance, and HOA.
Amortization
View the month-by-month loan schedule and balance path.
Payoff
Test extra payments and see how much interest they save.
Solar
Estimate panel count, production, electricity value, and simple ROI.
Finding Azimuth
Upload a north-up image, pick a point, drag a line, and read azimuth live.
What you can expect from a page here
- Most calculator math runs in your browser, while the request form is the main path that sends content to the server.
- Finance pages are estimates, not lending, tax, or investment advice.
- AI pricing pages cite the linked provider pricing pages and show verification dates.
- Solar and azimuth pages explain what they do not capture so you can spot when a professional tool is still required.
Review and contact
Request a new calculator
If the tool you want is not here yet, describe it. This creates a clean request you can copy, share, or email in one tap.