Cost of Capital Calculator

Free Cost of Capital Calculator Tool

Use our free Cost of Capital Calculator to find your WACC instantly. Accurate, fast results to sharpen your savings and investment plan today.

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* Set to default cost for SaaS
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Weighted average cost of capital
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Frequently Asked Questions

Calculate weighted average cost of capital in seconds. This free WACC calculator helps you make smarter savings decisions on your FIRE journey.

Q1: What is the Cost of Capital Calculator used for?

A: This tool calculates your weighted average cost of capital (WACC) — the blended rate a company pays to fund its assets. Enter your debt, equity, and tax rate. Get an instant, accurate result.

Q2: How do I calculate cost of capital manually?
A: Multiply your cost of debt by the debt weight, adjust for tax, then add it to cost of equity multiplied by the equity weight. Our calculator automates this in one step, so you skip the manual math.

Q3: What is a good WACC value?
A: A lower WACC signals cheaper financing and stronger investment potential. Most healthy SaaS companies target a WACC between 8% and 12%. Compare your number against industry benchmarks for context.

Q4: How does taking on more debt change cost of capital?

A: More debt often lowers WACC short-term because interest payments are tax-deductible. But too much debt raises risk and can push your cost of equity higher, offsetting the savings.

Q5: What's the difference between cost of debt and cost of equity?

A: Cost of debt is the interest rate you pay lenders. Cost of equity is the return investors expect for taking on risk. WACC blends both into one weighted figure.

Q6: Why does cost of equity default to 35% for SaaS companies?

A: SaaS businesses carry higher growth risk and rely heavily on equity funding. A 35% default reflects typical investor return expectations in this sector — you can adjust it to match your own numbers.

Q7: How accurate is this Cost of Capital Calculator?

A: The calculator uses the standard WACC formula trusted by finance professionals. Accuracy depends on the inputs you provide — debt, equity, and tax rate — so double-check your figures for the best result.

Q8: Can I use this tool for personal savings planning?

A: Yes. Understanding your cost of capital helps you set realistic return targets for personal investments. It's a useful benchmark when building your FIRE savings strategy.