Know Your
Numbers.
Every result comes with an AI read on what it means, not just a number. 92 calculators for capital decisions above $100K. Mortgage, FIRE, capital gains, estate tax. Results never leave your browser.
Average 30-yr mortgage
costs $285,071 in interest alone. Calculate yours →
$3,502
Monthly P+I
$740,569
Total interest
4.7 yrs
+$200 saves
●Loan Parameters
●Mortgage Breakdown
30Y / 7.12%Est. Monthly Payment
$3,501.58
Total Interest
$740,569
Pay $200/mo extra → save $138,754 interest + 4.7 yrs off
Every output is calculated to the dollar.
Not rounded. Not estimated.
92 calculators. Live market rates. Math runs in your browser. nothing stored, shared, or sold.
Rebuilt on Tested Engines.
Each of these runs on its own calculation engine with automated tests. More are rebuilt as search demand qualifies them.
Net Worth Percentile Calculator
See where your net worth ranks among American households in your age group using Federal Reserve Survey of Consumer Finances data.
CD Calculator
See CD interest from your APY and term, then the federal, NIIT and state tax on it and what you keep.
Mortgage Prepayment Calculator
Enter your extra monthly payment and see exactly how much interest you eliminate and how many years you cut off your loan.
Social Security Survivor Benefits Calculator
See a widow or widower's survivor benefit at every age from 60, the 82.5% cap when a spouse claimed early, and the best order to take survivor and your own benefit.
State Tax Relocation Calculator
Calculate annual income tax savings from relocating between states. Compare your current state against any no-tax or lower-tax state and see 5-year and 10-year cumulative savings.
Rental Property Sale Tax Calculator
What you owe when you sell a rental: depreciation recapture at your ordinary rate, capital gains, NIIT and state tax, compared with a 1031 exchange.
Pick Your Category.
92 calculators sorted by the financial decision you're actually making right now.
Featured Calculators.
Five calculators built for decisions above $100K. Real outputs, not rounded estimates.
REAL ESTATE
$285,071
avg interest on a $400K 30-yr loan at 7%
RETIREMENT
$1.25M
FIRE number at 4% rule on $50K/yr spending
SAVINGS & WEALTH
$1.2M
$500/mo at 7% compounded over 40 yrs
RETIREMENT
$4.2M
max contributions at 7% from age 25 to 65
TAX
$47,000
LTCG tax on $250K gain in the 20% bracket
The free tier covers 99%.
Pro covers the rest.
Built for decisions above $500K. One Pro session pays for itself before you hit submit.
or $199/year — save $149
View Pro FeaturesUnlimited AI
No session caps. Every scenario, every bracket, every what-if.
Saved scenarios
Revisit, compare, and share your exact inputs any time.
PDF reports
Clean, advisor-ready summaries of your calculations.
Early access
New calculators ship to Pro users 30 days before public launch.
Numbers that
talk back.
Every calculator reads your results, answers your questions, and surfaces the right next move.
Calculator + AI = Clarity
Enter your numbers. The AI reads your results like a senior financial advisor: context, risks, and what to do next.
Your DTI is 34% — within safe lending limits.
At 6.87%, refinancing in 18 months saves $41k.
Bi-weekly payments cut your term by 4.2 years.
Ask the numbers anything
Real answers tied to your actual inputs, not generic tips.
Paying $500 extra monthly cuts your term by 6.2 years and saves $58,400 in interest.
Matched to your situation
The AI surfaces 3 partners best suited to your numbers after every analysis.
Your numbers never leave
All calculations run locally. Nothing is stored, shared, or sold. The AI analyzes in the moment and then it's gone.
92 calculators. Free forever. No signup.
Open the CalculatorsStart Investing with Zero Commissions
Open a Fidelity brokerage account and put your compound interest calculations to work. $0 trades, no account minimums, fractional shares available.
Affiliated. We may earn a commission.
See how we compare.
Built for beginners. We're not.
NerdWallet serves first-time budgeters. CalcMoney models the $400K mortgage and the $1.2M portfolio — no beginner explainers, no content bloat.
HNW modeling
Data stored
Deep calculators
They show rates. We show $285,071.
Bankrate shows today's rate. CalcMoney shows your total 30-year interest burden — to the dollar, with live rates auto-filled.
They match advisors. We give you the math first.
SmartAsset funnels you to lead gen. CalcMoney's output stays in your browser — 0 bytes stored, no advisor call required.
They estimate value. We calculate cost.
Zillow tells you what your home is worth. CalcMoney shows PITI, break-even, and rent vs. buy — your true 30-year cost of ownership.
Rules change.
We send the numbers.
One weekly email: a number from the week, our latest posts and a calculator to try.
