Calculators Core Growth & Returns
Core Growth & Returns

Financial Calculators

Compound interest, future value, CAGR, ROI, real return, and the Rule of 72 — quick math for planning and sanity-checking a thesis, updates live as you type.

%
Compound Interest
Lump sum, no contributions
$
%
📈
Future Value
Lump sum + regular contributions
$
$
%
🧭
CAGR
Compound annual growth rate
$
$
💰
ROI
Return on investment, total & annualized
$
$
🪙
Real Return
Inflation-adjusted — what your growth is actually worth
$
%
%
⏱
Rule of 72
Quick doubling-time estimate — solve for either side
%
Planning & Risk

Savings, Sizing & Strategy

Goal-based savings, time-to-target, debt payoff, withdrawal safety, emergency runway, mortgage payments, and retirement drawdown — same live-as-you-type math.

🎯
Savings Goal
Monthly savings needed to hit a target
$
$
%
🏆
Millionaire Calculator
Time to reach any target (default $1M)
$
$
%
$
💳
Debt Payoff
Time & interest to clear a balance, with an extra payment
$
%
$
$
🛡️
Safe Withdrawal Rate
Max monthly withdrawal that lasts exactly N years
$
%
🧯
Emergency Fund
Months of coverage and the gap to your target
$
$
mo
🏠
Mortgage / Loan Payment
Standard amortized monthly payment
$
%
yr
⏳
How Long Will My Money Last
Retirement drawdown — fixed monthly withdrawal against a growing balance
$
$
%
Trading Tools

Risk & Position Math

Trade-level math for the journal side of the site.

⚖️
Risk/Reward Ratio
Entry, stop & target → ratio and breakeven win rate
$
$
$
🎲
Kelly Criterion
Optimal position size from win rate & payoff ratio
%
$
$