NPV Calculator
Net present value and IRR from a custom cash flow schedule — see if an investment clears your required return.
Your NPV Calculator Result
Generated from the inputs below — a record you can revisit, or share with anyone helping you plan.
Your detailsInput Parameters
Discount Rate
Your required rate of return or cost of capital — the higher this is, the more future cash flows are discounted.
Cash Flows
At a 10% discount rate, this investment adds $35,304 of value in today's dollars — generally worth pursuing.
Above your 10% discount rate, consistent with the positive NPV.
The simple sum of all cash flows, ignoring the time value of money — compare this to the NPV above to see what discounting costs you.
Entered as a negative cash flow.
Years (or other periods) after the initial investment.
Analysis
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Open calculatorOverview
The NPV Calculator helps you take control of your day-to-day financial life. It provides instant, accurate results and helps you model scenarios so you can make better decisions with your money.
Personal finance is 90% behavior and 10% math. Simple rules — paying yourself first, spending less than you earn, avoiding high-interest debt — beat complex strategies. This tool gives you the numerical clarity to make those behavior changes stick.
The Math Behind the Calculation
Most personal finance decisions come down to three equations:
Net Worth = Assets − Liabilities
Future Value = Present Value × (1 + r)^n
Your savings rate is the single most predictive number. A 10% savings rate means working 45 years to retire. A 50% rate cuts that to 17 years, per research from Mr. Money Mustache applying the 4% rule.
How to Use This Calculator
- Use real numbers. Pull your last three months of bank statements and actually add them up. Guesses are almost always 20–30% low on expenses.
- Include everything. Subscriptions, annual insurance bills (divided by 12), birthday gifts, car repairs. The annual "surprise" expenses are what derail budgets.
- Run multiple scenarios. Compare your current path to a "what if I saved $200 more per month" scenario. Seeing the long-term impact is motivating.
Understanding Your Results
Your results show how today's choices compound. Focus on:
- Savings rate — aim for 15–20% minimum; 25%+ to hit FI in a reasonable timeframe.
- Debt-to-income — under 36% is healthy per mortgage underwriting standards.
- Emergency fund coverage — months of expenses you can cover from liquid savings; aim for 3–6 months.
Behavioral Principles That Actually Work
- Automate everything. Transfers to savings should happen the same day your paycheck hits — before you see the money.
- Pay yourself first. Treat savings as a non-negotiable bill. Everything else comes out of what's left.
- Use the 24-hour rule for purchases over $100. Add it to a list. If you still want it in 24 hours, buy it. Most of the time, you won't.
- Focus on the big three. Housing, transportation, and food. Optimizing these matters 10× more than skipping coffee.
- Increase savings by 1% every quarter. Tiny changes compound. From 10% to 15% over a year is massive.
Frequently Asked Questions
How much should I have in an emergency fund?
3 months of essential expenses if you have stable W-2 income; 6–12 months if self-employed or commission-based. Keep it in a high-yield savings account (currently ~4–5% APY), not checking.
What's a realistic savings rate?
The US personal savings rate averages 4–5%. 15% is good. 25%+ puts you on an early-retirement trajectory. 50%+ is typical of FIRE movement practitioners and requires aggressive lifestyle design.
Should I budget to the dollar or use a broader system?
Both work. Detailed budgets (every dollar) catch leaks. "Pay yourself first + track totals" is easier to maintain. Pick the method you'll actually do for 12+ months.
How do I handle irregular income?
Calculate a 12-month rolling average. Pay yourself a consistent "salary" from a buffer account. Save every dollar above that average during good months for lean months.