Financial Calculators
Fill in your numbers, then click Calculate to open the full page and get a shareable link.
Real Estate Calculators
Rental Property Calculator
See a rental's monthly cash flow, cap rate, cash-on-cash return, and long-term ROI before you buy.
Purchase & Financing
Income & Operating Expenses
Long-Term Projection
Educational estimate only, not investment advice. Actual taxes, insurance, financing terms, rent, and appreciation will vary — verify local numbers before making an offer.
BRRRR Calculator
Model the full Buy, Rehab, Rent, Refinance, Repeat cycle — from cash left in the deal to cash flow after refi.
Buy & Rehab
Refinance
Rent & Operating Expenses
Educational estimate only, not investment advice. Assumes an all-cash or hard-money purchase paid off at refinance. Appraisals, lender LTV caps, and seasoning requirements vary — confirm with your lender before counting on a specific cash-out amount.
Fix & Flip Calculator
Estimate all-in costs, timeline, and net profit on a flip — plus the 70% Rule as a quick sanity check.
Purchase & Rehab
Financing & Hold
Educational estimate only, not investment advice. Excludes income taxes on the sale, which may include short-term capital gains or self-employment tax if flipping is a regular business activity — talk to a tax professional about your specific situation.
Airbnb / Short-Term Rental Calculator
Estimate revenue, cash flow, and returns for a short-term rental based on nightly rate and occupancy.
Purchase & Financing
Revenue & Operating Expenses
Educational estimate only, not investment advice. Short-term rental income is seasonal and market-dependent, and many cities restrict or license short-term rentals — confirm local rules before buying for this purpose.
Mortgage Calculator
Prefilled with national averages: $429,100 median home price, 19% down payment, 7.03% 30-yr rate — as of Q3 2026 (NAR, Freddie Mac PMMS).
70% Rule Calculator
The 70% rule is a rough flipper guideline, not a valuation — it doesn't account for holding costs, financing, or selling costs (see the Fix & Flip Calculator for the full picture). Educational only, not investment advice.
Rehab Cost Estimator
Build a line-item renovation budget and see the total with a contingency cushion.
Enter your own contractor bids or estimates for each category — defaults are just rough starting points, not local pricing.
A budgeting worksheet, not a bid — actual rehab costs vary widely by market, property condition, and scope. Always get contractor quotes before finalizing an offer. Educational only, not investment or construction advice.
Financial & Retirement Calculators
Compound Interest Calculator
Step 1 · Initial Investment
Amount of money available to invest initially.
Step 2 · Contribute
Use a negative number for monthly withdrawals.
How long you plan to save.
Step 3 · Interest Rate
Your estimated annual rate.
Range above and below the rate to model.
Step 4 · Compound It
Times per year that interest will be compounded.
Self-Employed - Choosing Right Retirement Plan Calculator
Net profit from Schedule C (sole proprietor) or Schedule K-1 (partnership/LLC taxed as one) — not gross revenue.
For self-employed individuals only (sole proprietors, and partners/LLC members taxed as such) — not corporations. Figures use the IRS limits published for the selected contribution year. This calculator is for general education only and is not tax, legal, or investment advice. Consult a qualified tax or retirement-plan professional about your specific situation.
Retirement Savings Longevity Calculator
Grows with inflation each year. Defaults to ~4% of the starting balance — the classic 4% rule. Adjust up or down for your situation.
Want a more realistic view?
This basic version assumes a single, steady rate of return every year. Markets don't actually work that way — returns vary, and bad years early in retirement hurt much more than bad years late ("sequence-of-returns risk").
The Advanced Portfolio Longevity Simulator (Premium) runs your actual ticker mix through historical returns and 1,000 Monte Carlo scenarios to estimate the probability your portfolio survives.
Time Value of Money Calculator
What the money is worth today.
Expected yearly return or discount rate.
How far into the future.
How often the return compounds.
What is the time value of money?
A dollar today is worth more than a dollar tomorrow — because money can earn a return. The time value of money (TVM) measures exactly how much more.
For example, $30,000 invested at 7% annually for 15 years grows to about $82,771. That's the power of compounding: your return earns its own return, year after year.
You can also flip the math: if you need $60,000 in 15 years and expect 7% returns, you only need to set aside about $21,703 today.
Rule of 72 Calculator
Enter the expected annual interest rate or return.
What is the Rule of 72?
The Rule of 72 is a quick mental math shortcut to estimate how long it takes for an investment to double at a fixed annual rate of return. Simply divide 72 by the interest rate to get the approximate number of years.
For example, at 8% annual return: 72 ÷ 8 = 9 years to double your money. The actual time (using the exact logarithmic formula) is about 9.01 years — remarkably close.
This rule works well for rates between 6% and 10%. It becomes less accurate at very low or very high rates.
Estate & Gift Tax Calculator
Estimate federal estate tax and state death tax on your gross estate.
Estate Details
Tax Settings
This calculator is designed to be informational and educational only, and does not constitute tax or legal advice. Consult a qualified estate planning attorney or tax professional for your specific situation.
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