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Average-down calculator
What does averaging down do to your cost basis? Add each buy below to see the new per-share cost, the breakeven sell price, and how far the current price is from it.
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DCA return calculator
Is your recurring plan in the green? How big a rise gets you back to breakeven, and how many periods until a target return under an assumed rate?
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Real-APR calculator
Turn a quoted monthly fee rate into the true annualized cost.
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Position-size calculator
Set the max loss first, then back into the share count — fixed-risk sizing. The stop sets per-share risk, the budget sets shares, rounded down to whole lots.
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Annualized-return calculator
Staggered contributions each compound for a different span. The XIRR measure finds the monthly rate that grows all of them into today's value, annualized.
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Compound-growth calculator
FV = P(1+r)ⁿ + PMT·[((1+r)ⁿ −1)/r]. Four inputs show where principal plus steady saving compounds to.
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Inflation purchasing-power calculator
Inflation is compounding in reverse: the figure stays, purchasing power shrinks. Three inputs show a sum's time value.
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Mortgage prepayment calculator
The same 100k prepaid can save very different interest under 'shorter term' vs 'lower payment'. Enter your remaining balance and months — both routes are computed side by side.
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Installment quote comparison
'Lower monthly' and 'smaller fees' are rarely on the same ruler. Break both offers into cash flows and the difference becomes obvious.
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Prepayment cash-buffer check
Prepaying saves interest but spends liquidity. Three amounts side by side: how many months of living costs remain, and how much the payment drops.
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Investment-goal calculator
'1 million in 10 years' is a solvable equation, not a slogan: target minus what your principal becomes is the gap monthly saving must fill. Vary the rate and horizon to feel the pressure shift.
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Portfolio-rebalance calculator
After a rally the 60% stock sleeve quietly becomes 78%. Enter each sleeve's value and the modelled buy and sell for every line is laid out.
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FIRE calculator
FIRE number = annual spending ÷ assumed withdrawal rate (25× at 4%). Compound your current assets plus monthly saving toward it and the timeline falls out — an estimate under constant returns, not a guarantee.
Open tool →- Average-down calculatorOpen →
- DCA return calculatorOpen →
- Real-APR calculatorOpen →
- Position-size calculatorOpen →
- Annualized-return calculatorOpen →
- Compound-growth calculatorOpen →
- Inflation purchasing-power calculatorOpen →
- Mortgage prepayment calculatorOpen →
- Installment quote comparisonOpen →
- Prepayment cash-buffer checkOpen →
- Investment-goal calculatorOpen →
- Portfolio-rebalance calculatorOpen →
- FIRE calculatorOpen →
Our reporting
When the Quote Lags: Checking Official Filings on SSE and SEC EDGAR Yourself
Delayed quotes and secondhand headlines can mislead. This guide shows how to trace a company's own disclosure back to the source: searching announcements by stock code on the Shanghai Stock Exchange website, using statutory reporting windows to judge whether a figure is officially out, avoiding repealed rule texts, and, for US-listed companies, using SEC EDGAR filings including amended 10-K/A restatements, with a concrete case where a restatement cut 2013 AFFO by 18.60%.
Our reporting
A Revenue Line and a Profit Line Sit on Separate Rows
FactSet's October 23, 2026 note puts two growth rates on the S&P 500 for the third quarter. Blended earnings are up 29.5% from a year earlier.
Our reporting
S&P 500 vs Dow Jones vs Nasdaq-100, and Why Weighting Rules Make Them Move Differently
Anyone monitoring financial news quickly encounters an apparent contradiction on the trading screen.
Our reporting
The 1951 Accord Separated Debt Management from Monetary Policy
On 4 March 1951 the Treasury-Federal Reserve Accord separated the two on monetar…
Our reporting
APR vs Monthly Installment Fees: Why a Low Monthly Fee Means a Much Higher Yearly Rate
When purchasing electronics or financing online retail purchases, payment screens frequently highlight slogans like "just 0.4% monthly fee" or "split your…
Our reporting
A Stock Is an Ownership Stake; a Bond Is a Loan With a Maturity Date
A share of stock is a piece of the company. A bond is a loan that comes due on a…
Our reporting
The Interest Rate Leaves Fees Out; APR Includes Them
A mortgage quote carries two percentages, and they count different charges. The…
Our reporting
Managing Cash in Low-Rate Cycles: High-Yield Savings, CD Ladders, and Liquidity Rules
During monetary easing cycles, central bank interest rate reductions trigger immediate ripple effects across retail banking.
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