Know Your
Numbers.
86 calculators for decisions above $100K. Mortgage, FIRE, capital gains, net worth, estate tax, RSU. Results stay in 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.
45 calculators. Live market rates. Math runs in your browser. nothing stored, shared, or sold.
Pick Your Category.
73 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 is connected to an AI that 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.
73 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.
Fed moves.
You hear first.
Rate changes, CPI releases, FOMC decisions. A numbers-first briefing within hours of each event.