llms.txt
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− > 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 351 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 20 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 mathematical calculations include an unsigned calculation receipt with inputs, results, method checks, assumptions and warnings; it is not certification or a stored au− For exact REST and MCP request envelopes, examples for all 20 tools, supported operations and error recovery, see https://buscalc.com/for-ai/#request-help. MCP advertises tools only; resources, prompts, completion, logging and tasks are not supported. Tool input schemas include illustrative argument examples. HTTP 200 with MCP result.isError=true is a failed calculation; inspect the fixed errorCode and recovery hint before retrying.− - [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.− - [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.− - [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 twenty 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 twenty 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.+ > Free business and trade calculators with optional paid reports.+ Methods and sources: https://buscalc.com/llms-full.txt.+ NexusNeed allocation and review: https://buscalc.com/nexusneed/ (buscalc_nexusneed).+ Batch receipts: https://buscalc.com/for-ai/#calculate-batch (buscalc_calculate_batch).+ - [Opportunity Evidence Review](https://buscalc.com/nexusneed/#opportunity-evidence): Compare demand signals.+ ## Evidence and records+ - [Verify BusCalc receipts and proofs](https://buscalc.com/verify/): Replay receipts or check proofs in the browser, API or MCP. Keep private inputs local.+ - [Public record checkpoints](https://buscalc.com/checkpoints/): Inspect public checkpoint status.+ - [Trusted checkpoint keys](https://buscalc.com/assets/verify/trusted-keys.json): Published verifier keys.+ - [BusCalc Excel add-in](https://buscalc.com/excel-add-in/): Run supported calculations and replay receipts in Excel.+ - [Verify a sealed record](https://buscalc.com/verify-record/): Check a local file against its proof and check whether BusCalc has a timestamp record.+ - [Decision Provenance](https://buscalc.com/decision-provenance/): Preserve calculation assumptions, evidence and decisions.+ - [Transport and Debris Records](https://buscalc.com/transport-and-debris-records/): Document detention, freight and debris loads.+ - [Compare construction progress bills](https://buscalc.com/compare-progress-bills/): Compare two downloaded progress billing receipts on your device.+ - [CBAM embedded emissions evidence](https://buscalc.com/cbam-emissions-evidence/): Record shipment, installation and emissions inputs for an EU CBAM review. Fingerprint supporting files and seal a private record.+ - [FSMA 204 food traceability lot records](https://buscalc.com/fsma-204-lot-records/): Keep linked food lot, event, location and reference-document details in a sealable record on your device.+ - [EUDR plot and origin evidence](https://buscalc.com/eudr-plot-evidence/): Capture commodity, plot references, production dates and GeoJSON plot geometry in a private sealable evidence record.+ - [IEEPA tariff refund ledger](https://buscalc.com/ieepa-tariff-refund-ledger/): Reconcile recorded IEEPA duty principal, refund principal and interest against entry and CAPE references.+ - [California rental deposit photo fingerprints](https://buscalc.com/rental-deposit-photo-evidence/): Group local photos by unit condition stage and preserve their exact fingerprints in a rental deposit evidence manifest.+ - [Disaster contents inventory](https://buscalc.com/disaster-contents-inventory/): Record damaged belongings, quantities and values with fingerprints for photos, receipts and other supporting files.+ - [Construction lien waiver tracker](https://buscalc.com/lien-waiver-tracker/): Keep a private record of requested, received and reviewed lien waivers and link the supporting progress bill.+ - [Certified payroll preparation worksheet](https://buscalc.com/certified-payroll-worksheet/): Reconcile reported weekly hours, wages, fringe and deductions before preparing a certified payroll filing.+ - [Gig pay recalculation](https://buscalc.com/gig-pay-recalculation/): Compare entered gig pay and adjustments with actual payouts and estimate net proceeds after entered work costs.+ - [Merchant cash advance reconciliation](https://buscalc.com/merchant-cash-advance-reconciliation/): Compare actual merchant cash advance debits with the amount calculated from entered eligible receipts and a contract split rate.+ - [Fixed asset register](https://buscalc.com/tools/fixed-asset-register/): Browser workspace.+ - [Mileage log](https://buscalc.com/tools/mileage-log/): Browser workspace.+ - [Sales tax nexus tracker](https://buscalc.com/tools/nexus-tracker/): Browser workspace.+ - [Plan takeoff](https://buscalc.com/tools/plan-takeoff/): Browser workspace.+ - [Mechanics lien deadlines](https://buscalc.com/tools/mechanics-lien-deadlines/): Browser workspace.+ - [Construction pay application](https://buscalc.com/tools/pay-application/): Browser workspace.+ - [Sales tax rate by location](https://buscalc.com/sales-tax-rate-by-location/): Browser workspace.+ - [Bitcoin block headers](https://buscalc.com/assets/verify/btc-headers.json): Published headers for offline checks.+ - [Checkpoint log API](https://buscalc.com/api/record-proof/checkpoints): Read published checkpoints as JSON.+ 446 worksheets plus specialty, scientific and graphing tools. Currency labels do not convert values.+ REST and MCP share 125 calculation and lookup tools. MCP also lists batch, verification and enabled publishing tools. Use tools/list for the current MCP inventory.+ Full feasibility studies and Commitment Collision Analysis are browser-only.+ Blockchain: fee, payment and lot estimates, unit conversion, and public address, ABI and Merkle checks. Never send wallet secrets. https://buscalc.com/for-ai/#blockchain-api+ Seal only a receipt commitment via buscalc_seal_record or POST https://buscalc.com/api/record-proof/commitments. Keep the receipt and nonce private. https://buscalc.com/for-ai/#seal-a-receipt+ Opportunity worksheets (schemas in https://buscalc.com/ai-tools.json): buscalc_self_employment_tax_and_quarterly_estimated_tax_planner, buscalc_qualified_overtime_deduction_worksheet, buscalc_qualified_tips_deduction_worksheet, buscalc_2026_business_mileage_deduction_with_mid_year_rate, buscalc_section_179_vs_bonus_vs_macrs_depreciation_comparison, buscalc_qualified_business_income_deduction_estimate, buscalc_s_corp_salary_and_distribution_payroll_tax_comparison, buscalc_futa_tax_with_state_cred+ Callable blockchain tools: buscalc_chain_btc_fee, buscalc_chain_evm_fee, buscalc_chain_solana_fee, buscalc_chain_unit_convert, buscalc_chain_address_validate, buscalc_chain_invoice_quote, buscalc_chain_payment_cost_compare, buscalc_chain_cost_basis, buscalc_chain_staking_yield, buscalc_chain_impermanent_loss, buscalc_chain_mining_profit, buscalc_chain_block_time, buscalc_chain_abi_selector, buscalc_chain_abi_codec, buscalc_chain_merkle_verify, buscalc_chain_merkle_root.
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