Cost-Benefit Calculator

• •Use the Cost-Benefit Calculator when solving homework or exam problems that require quick numerical verification of your hand calculations — instant feedback helps identify arithmetic errors before they propagate.
• •Use it during the early design phase to rapidly iterate on parameters and narrow down feasible configurations before committing time to detailed finite element simulations or full design packages.
• •Use it when reviewing a colleague's calculation or checking a vendor's data sheet for plausibility — a quick sanity check can prevent costly downstream errors.
• •Use it to generate reference data for a technical report or presentation without manual computation, ensuring consistent, reproducible numbers throughout the document.
• •Use it in the field when a quick estimate is needed and a full engineering software package is not available.

The Cost-Benefit Calculator is a precision engineering calculation tool designed for students, engineers, and technical professionals. Enter annual costs and benefits (up to 20 years). Compute B/C ratio, net benefit, PV of costs and benefits, and cumulative cash flow chart. All calculations are performed using established engineering formulas from the relevant scientific literature and standards. Inputs support both metric (SI) and imperial unit systems, with unit conversion handled automatically — simply select your preferred unit from the dropdown next to each field. Results are computed instantly in the browser without sending data to a server, ensuring both speed and privacy. This calculator is intended as a supplementary tool for learning and design exploration; always verify results against authoritative references for safety-critical applications.

Cost-benefit analysis (CBA) compares the economic costs and benefits of a decision, project, or policy to determine whether the benefits justify the costs. The benefit-cost ratio B/C = present value of benefits / present value of costs. If B/C > 1, benefits exceed costs and the project is acceptable; if < 1, costs exceed benefits. The net benefit (B − C) is the absolute value added by the project and is often more useful than the ratio for ranking decisions. All future benefits and costs are discounted to present value at an appropriate rate. Quantifying benefits requires translating non-monetary outcomes into dollar values — statistical value of a life, hedonic pricing for environmental quality, travel time savings from transportation improvements. This quantification is often controversial and sensitive to assumptions. Sensitivity analysis shows how the conclusion changes with different input values. CBA is widely used in public policy (regulation impact analysis, infrastructure projects), environmental economics, healthcare (cost-effectiveness of treatments), and private investment decisions. Proper CBA requires: identifying all impacts (intended and unintended), valuing them appropriately, discounting to consistent present value, and reporting uncertainty in the results.

• •Public infrastructure evaluation: determine whether a highway, bridge, or transit project creates more value than its cost.
• •Environmental regulation: evaluate whether a proposed emission standard's benefits (health, environmental) exceed its compliance costs.
• •Healthcare cost-effectiveness: compare medical treatments on the basis of cost per quality-adjusted life year (QALY) or similar outcomes.
• •Workplace safety investment: justify ergonomic improvements, safety training, or PPE upgrades by comparing cost to prevented injury costs.
• •Corporate capital allocation: rank multiple investment opportunities by B/C ratio or NPV to prioritize those creating the most value.