BusCalc: Free calculators for decisions, quotes and AI workflows

Hi Product Hunt! I’m John, the founder of BusCalc.

I built BusCalc around the questions people face while doing real work: What should I charge? What will this equipment actually cost? How much material do I need? Is this plan feasible—and what would need to change to make it work?

Today, BusCalc brings together 351 free, ad-free calculators for businesses, trades and everyday decisions, plus specialty workspaces for scientific math, graphing, probability, statistics and financial feasibility. No account is required to use the free calculators.

Our own Decision Feasibility Calculator helps you test supported plans against your entered requirements, uncertainty ranges and permitted changes. It makes the assumptions and limits visible so you can inspect what drives the result.

New additions include live silver, gold, platinum and palladium quotes with source information and timestamps, plus stock, earnings, portfolio and oil calculators using figures you supply. Live spot pricing covers precious metals. We also provide dated EIA fuel/energy and ECB currency references, plus NOAA/NWS weather observations, forecasts and official alerts. Reporting dates are explicit; energy averages are not live tariffs. New energy and weather-impact calculators connect those sources to entered quantities, work limits and costs. Conditional weather windows are not safe or guaranteed operating windows.

Want to turn the numbers into something useful for a customer? Optional paid packages provide branded reports, scenario comparisons, customer quotes and complete job documents. Free on-page charts and 12 embeddable widgets help make the calculations easier to understand and share.

For developers and AI builders, our free API and MCP connection now offers 26 tool families: 23 mathematical families and three attributed public-data lookups. Successful calculations return an unsigned calculation receipt with method details and a replayable request; data lookups return attributed source snapshots instead. Connection guide: https://buscalc.com/for-ai/

I’d especially appreciate feedback on:

• Whether the inputs and instructions fit your actual work

• Whether the results help you decide what to do next

• Any calculation, unit or usability issue you encounter

• Which calculator, widget or API method you would use regularly

We show formulas, assumptions and limitations. These are planning tools, not professional certification or guarantees. Try a tool relevant to your work and tell me where it helps—or where it falls short. Thanks for taking a look!