About Cost-Benefit Analyzer

Analyze cost-benefit scenarios for business decisions. Part of the DevTools Surf developer suite. Browse more tools in the Business & Corporate collection.

Use Cases

• Evaluate whether to build vs buy a software tool
• Justify infrastructure investment to finance or leadership teams
• Compare two architectural approaches by total 5-year cost and expected benefit
• Assess the ROI of hiring an additional engineer vs using a contractor

Tips

• Enter costs and benefits over a multi-year horizon, not just year one — the NPV calculation discounts future cash flows to compare scenarios on equal footing
• Set the discount rate to your company's hurdle rate or WACC — this is the minimum return required to justify an investment
• Add qualitative factors (risk reduction, regulatory compliance, team morale) in the non-quantifiable benefits section to capture value that doesn't appear in the numbers

Fun Facts

• Cost-benefit analysis was first systematically applied in 1848 by French engineer Jules Dupuit to evaluate the value of public works projects — specifically, bridges. He was the first to formalize the concept of consumer surplus in economic terms.
• The US federal government requires formal cost-benefit analysis for major regulations (those with economic impact exceeding $100 million) under Executive Order 12866, originally signed by President Clinton in 1993. OMB oversees compliance.
• The Benefit-Cost Ratio (BCR) of the Hoover Dam was calculated at approximately 3.5:1 when built in the 1930s — meaning $3.50 in benefits for every $1 of cost. Modern infrastructure projects typically target a BCR above 1.5.

FAQ

What is Net Present Value (NPV) and why use it?

NPV calculates the present value of all future cash flows minus the initial investment. It accounts for the time value of money — a dollar today is worth more than a dollar in 5 years. A positive NPV means the investment creates value above the cost of capital.

What discount rate should I use?

Use your company's weighted average cost of capital (WACC) for internal projects. For rough estimates, 10% is a common default for private companies; 5-7% for government projects; 8-12% for private equity. Higher discount rates make distant benefits worth less today.

What is the difference between ROI and NPV?

ROI is (benefit - cost) / cost — a simple percentage without time adjustment. NPV discounts all future cash flows to present value, making it more accurate for multi-year investments. Use NPV for anything beyond 1-2 years; ROI is fine for quick back-of-envelope estimates.