Reproduce a US Etsy order-margin example, separate collected tax from revenue, and compare attributed Offsite Ads costs with other selling expenses.
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Financial calculators and practical trading guides
Work through a decision with clear inputs, visible formulas and worked examples. Explore trading, business and household finance tools, then read the assumptions behind the result.
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Trading Calculators
Position sizing, trading risk, profit and contribution calculations.
Explore tools →Business Calculators
Pricing, fees, margins and business decisions.
Explore tools →Work & Pay Calculators
Calculate work hours, gross pay and leave balances with clear assumptions and downloadable results.
Explore tools →Property & Rental Calculators
Estimate rental returns, cash flow, debt coverage and loan payments. Separate operating performance from financing.
Explore tools →Savings & Debt Calculators
Plan a savings target, size an emergency cushion and compare debt repayment strategies with transparent assumptions.
Explore tools →Percentage & Growth Calculators
Compare changes, recover original amounts, annualize growth and combine weighted figures with clear formulas.
Explore tools →Dividend & Investment Income Tools
Calculate dividend income, model reinvestment, solve bond prices and yields, and build a maturity cash-flow calendar with downloadable ledgers.
Explore tools →Mortgage Decision Tools
Evaluate recasting, discount points, extra payments, dated payment frequency and refinancing with fees, remaining debt and complete schedules.
Explore tools →Auto Finance & Ownership Tools
Compare auto refinancing, lease versus buy, trade-in debt and vehicle depreciation. Build a car budget with complete schedules, explicit fees and CSV downloads.
Explore tools →Latest articles
Browse summaries below. Open an article for its complete discussion and sources.
Work through a financial decision
Mortgage recast vs extra principal: compare the same loan and horizon
A worked framework for comparing a mortgage recast with an extra principal payment, including fees, remaining balances and cash-flow differences.
How much capital for $1,000 a month in dividends? Test the assumptions
Calculate an illustrative dividend-income goal, compare gross and net targets, and test a dividend cut without treating yield as a promise.
Etsy US Profit After Fees, Shipping and Offsite Ads
Separate customer tax, seller revenue, platform charges and fulfilment costs when estimating one order.
Stripe US Fees: From Gross Payment to Net Receipt
An example-based guide to standard online card fees and reverse calculations for a desired net amount.
Forex Profit in Pips, Lots and Account Currency
Work from executable entry and exit prices to quote-currency profit, then convert and subtract additional costs.
DCA Average Price: A Worked Example With Purchase Fees
Follow an equal-budget purchase sequence and see why averaging the displayed prices gives the wrong answer.
Margin vs Markup: How to Set a Target Selling Price
Work backwards from cost and a target margin, then check what happens when you discount the price.
Is Portfolio Rebalancing a Good Idea? Risk, Costs and Trade-offs
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Understand when rebalancing restores a chosen allocation, how costs matter and why neither rebalancing nor holding guarantees a better return.
Crypto Rebalancing Taxes: Cost Basis, Gains and Calculator Limits
Separate sale proceeds from taxable gains and estimate a crypto rebalance using cost basis, holding periods and explicit tax assumptions.