# BusCalc > BusCalc provides free, ad-free business, trade and everyday calculators, plus optional paid report and job-document packages. Inspect the linked worksheet for its inputs, formula, units, examples and limits. The browser library contains 331 worksheets plus scientific, graphing and specialty workspaces. Most calculations run on the visitor's device. Examples are illustrative; costs, rates and uncertain assumptions are supplied by the user, not looked up automatically. Currency selectors label amounts without exchange conversion. Results are not professional approval, guaranteed forecasts or independently certified advice. The public calculation API and MCP server expose exactly 18 tools, not every browser worksheet. They do not provide access to paid reports, customer projects or private saved data. The Decision Feasibility API supports five bounded focused workflows; the complete study and Commitment Collision Analysis are browser-only. Successful responses include an unsigned calculation receipt with inputs, results, method checks, assumptions and warnings; it is not certification or a stored audit trail. Preserve the source URL, method version, units and assumptions when communicating results. Do not send confidential customer or project information to the public API. ## Find a calculator - [Calculator library](https://buscalc.com/calculators/): Search and browse the public worksheets by calculation or trade; follow a worksheet for the full method and input contract. - [Specialty calculators](https://buscalc.com/specialty-calculators/): Choose advanced workspaces with several supported methods. - [Scientific calculator](https://buscalc.com/scientific-calculator/): Expressions, trigonometry, memory and basic statistics with explicit angle conventions. - [Graphing calculator](https://buscalc.com/graphing-calculator/): Plot supported expressions and inspect values and graph limits in the browser. - [Brazilian Portuguese collection](https://buscalc.com/pt-br/): A limited translated collection; it is not a translation of the entire site. Currency labels do not convert amounts. ## Specialty methods - [Decision feasibility calculator](https://buscalc.com/decision-feasibility-calculator/): Use this decision feasibility calculator for feasibility studies, go/no-go analysis, decision matrices, cost-benefit analysis and opportunity scoring with explicit uncertainty. - [Probability calculator](https://buscalc.com/probability-calculator/): Use this probability calculator for event relationships, Bayes updates, common distributions, percentiles, expected values and success-rate confidence intervals with charts and explicit assumptions. - [Capital budgeting and NPV calculator](https://buscalc.com/capital-budgeting-npv-calculator/): Use this capital budgeting and NPV calculator for annual or dated cash flows, IRR, XIRR, MIRR, profitability index, payback, equivalent annual value and scenario comparison. - [Commercial real estate feasibility calculator](https://buscalc.com/commercial-real-estate-feasibility-calculator/): Use this commercial real estate feasibility calculator for acquisition cash flow, NOI, DSCR, cap rates, LTV/LTC, equity returns, exit value and downside stress tests. - [Renewable energy and infrastructure feasibility calculator](https://buscalc.com/renewable-energy-infrastructure-feasibility-calculator/): Use this renewable energy and infrastructure feasibility calculator for project cash flow, discounted lifecycle cost, LCOE, NPV, equity returns and production or cost stress scenarios. - [SaaS and business model feasibility calculator](https://buscalc.com/saas-business-model-feasibility-calculator/): Use this SaaS and business model feasibility calculator for subscription cohorts, MRR/ARR, churn, retention, CAC payback, bounded LTV, burn, cash runway and downside scenarios. - [GPT usage remaining calculator](https://buscalc.com/gpt-usage-remaining-calculator/): Use this GPT usage remaining calculator to plan weekly and five-hour allowances from your own snapshots, consumption rates, reserve targets and reset times. - [Mechanical and material strength calculator](https://buscalc.com/mechanical-material-strength-calculator/): Use this mechanical and material strength calculator for bend allowance, beam deflection, section properties, axial stress, shaft torsion, torque, ratios and bearing rating life. - [Fluid and thermal industrial calculator](https://buscalc.com/fluid-thermal-industrial-calculator/): Use this fluid and thermal industrial calculator for cylinder force, pneumatic air consumption, pump power, pipe pressure loss, tank volume, thermal expansion and heating time. - [Industrial production capacity calculator](https://buscalc.com/industrial-production-capacity-calculator/): Use this industrial production capacity calculator for conveyor throughput, takt time, workstation capacity and machining removal rates and correctly labeled Cp/Cpk or Pp/Ppk process indices. - [Construction calculator](https://buscalc.com/construction-calculator/): Use this construction calculator for feet, inches and fractions, right-triangle dimensions and equal stair-rise layouts. - [Financial calculator](https://buscalc.com/financial-calculator/): Use this financial calculator to solve time-value-of-money unknowns and evaluate cash-flow NPV and IRR with explicit signs and payment timing. - [Statistics calculator](https://buscalc.com/statistics-calculator/): Use this statistics calculator to summarize data, fit linear regression models and calculate normal or binomial probabilities with visible assumptions. - [Algebra and matrix calculator](https://buscalc.com/algebra-matrix-calculator/): Use this algebra and matrix calculator to solve quadratic equations and linear systems, multiply matrices, and calculate inverses and determinants. - [Cutting layout optimizer](https://buscalc.com/cutting-layout-optimizer/): Use this cutting layout optimizer to plan linear stock cuts and rectangular sheet layouts with blade width, edge trim and rotation options. - [Psychrometric calculator](https://buscalc.com/psychrometric-calculator/): Use this psychrometric calculator to find humidity ratio, dew point, wet-bulb temperature and air enthalpy from measured conditions. - [Machinist calculator](https://buscalc.com/machinist-calculator/): Use this machinist calculator to convert supplied cutting speed to RPM and calculate milling or drilling feed rates and travel time. ## Callable tools and connection documentation - [For AI](https://buscalc.com/for-ai/): Read the connection instructions, supported protocols, privacy terms and operational limits before calling tools. MCP uses stateless Streamable HTTP at https://buscalc.com/api/mcp; direct API requests POST JSON to https://buscalc.com/api/ai/calculate. No application login or API key is required. Shared limits apply; availability is not guaranteed. - [Tool catalog](https://buscalc.com/ai-tools.json): Machine-readable definitions of the eighteen available tool families and their input schemas. - [OpenAPI 3.1 description](https://buscalc.com/openapi.json): Direct calculation API request and response contracts. - [OpenAPI 3.0 compatibility description](https://buscalc.com/openapi-3.0.json): Equivalent compatibility specification for importers requiring OpenAPI 3.0. - [ARD discovery manifest](https://buscalc.com/.well-known/ard.json): One BusCalc MCP resource entry, with representative queries and the eighteen supported capabilities. - [MCP Server Card](https://buscalc.com/api/mcp/server-card): Connection identity, transport, protocol versions and public pilot scope. - [Fleet cost per mile](https://buscalc.com/calculators/fleet-cost-per-mile/): Callable tool: buscalc_fleet_cost_per_mile. Read this source page for its assumptions. - [Markup vs margin](https://buscalc.com/calculators/markup-vs-margin/): Callable tool: buscalc_markup_vs_margin. Read this source page for its assumptions. - [Recipe portion cost](https://buscalc.com/calculators/recipe-portion-cost/): Callable tool: buscalc_recipe_portion_cost. Read this source page for its assumptions. - [Service business hourly rate](https://buscalc.com/calculators/service-business-hourly-rate/): Callable tool: buscalc_service_business_hourly_rate. Read this source page for its assumptions. - [Equipment ownership cost per hour](https://buscalc.com/calculators/equipment-ownership-cost-per-hour/): Callable tool: buscalc_equipment_ownership_cost_per_hour. Read this source page for its assumptions. - [Break even sales](https://buscalc.com/calculators/break-even-sales/): Callable tool: buscalc_break_even_sales. Read this source page for its assumptions. - [Equipment loan payment](https://buscalc.com/calculators/equipment-loan-payment/): Callable tool: buscalc_equipment_loan_payment. Read this source page for its assumptions. - [Feet and inches](https://buscalc.com/calculators/feet-and-inches/): Callable tool: buscalc_feet_and_inches. Read this source page for its assumptions. - [Time duration](https://buscalc.com/calculators/time-duration/): Callable tool: buscalc_time_duration. Read this source page for its assumptions. - [Decision feasibility calculator](https://buscalc.com/decision-feasibility-calculator/): Callable tool: buscalc_decision_feasibility. Read this source page for its assumptions. - [Probability calculator](https://buscalc.com/probability-calculator/): Callable tool: buscalc_probability. Read this source page for its assumptions. - [Statistics and regression](https://buscalc.com/statistics-calculator/): Callable tool: buscalc_statistics. Read this source page for its assumptions. - [Algebra and matrix calculations](https://buscalc.com/algebra-matrix-calculator/): Callable tool: buscalc_linear_algebra. Read this source page for its assumptions. - [Unit conversion and dimensional checks](https://buscalc.com/for-ai/#unit-conversion-and-dimensions): Callable tool: buscalc_unit_checks. Read this source page for its assumptions. - [Financial mathematics](https://buscalc.com/for-ai/#financial-mathematics): Callable tool: buscalc_financial_mathematics. Read this source page for its assumptions. - [Contribution-profit sensitivity and thresholds](https://buscalc.com/for-ai/#sensitivity-and-thresholds): Callable tool: buscalc_sensitivity. Read this source page for its assumptions. - [Bounded ranges and uncertainty propagation](https://buscalc.com/for-ai/#uncertainty-propagation): Callable tool: buscalc_uncertainty. Read this source page for its assumptions. - [Expected value of information](https://buscalc.com/for-ai/#value-of-information): Callable tool: buscalc_value_of_information. Read this source page for its assumptions. ## Methods, attribution and boundaries - [Methodology](https://buscalc.com/methodology/): How formulas, sources, units and validation are handled; citations are not publisher endorsements. - [Calculation limitations](https://buscalc.com/limitations/): Business, financial and engineering limits and responsibilities when applying results. - [Decision Feasibility provenance](https://buscalc.com/decision-feasibility-provenance.json): BusCalc implementation history, method identity and recorded component scope; not a claim of exclusive ownership of underlying mathematics. - [Privacy](https://buscalc.com/privacy/): Device calculations, analytics, explicit saves and privacy-preserving operational counters. - [Paid tools](https://buscalc.com/offers/): Compare four one-time packages. The Annual Job Plan is coming soon, not currently purchasable. Paid exports require verified purchase access; basic calculations and printing remain free. - [Paid tool terms](https://buscalc.com/terms/): Package durations, saved-project retention and refund limits. ## Optional - [Business calculus guide](https://buscalc.com/business-calculus/): Independent lessons, quizzes and a supported-method calculator; no affiliation with courses or textbook publishers. - [Embeddable widgets](https://buscalc.com/widgets/): Twelve free browser calculator widgets, with attribution, privacy and embedding instructions. - [Support](https://buscalc.com/support/): Purchase and recovery guidance; keep private recovery codes confidential. - [Public sitemap](https://buscalc.com/sitemap.xml): Current indexable public page URLs. This llms.txt is a curated guide, not the full page inventory.