P&L Calculator

Guides

Understand the number, not just the answer.

Short, practical explainers for the calculations that shape trades, prices and business decisions.

56 guides · Page 1 of 5

Editorial arrangement of purchase and sale blocks with small fee slices reducing the final gainTrading basics · 7 min readYour Trade Is Green. But What Did You Actually Make?Calculate real stock profit and loss after buy and sell fees, understand return percentage, and avoid the cost-basis mistakes that distort a trade.Read guide →Editorial measuring structures showing the same profit compared against cost and selling priceBusiness pricing · 6 min readThe 40% Pricing TrapMarkup and profit margin measure the same profit from different starting points. See why a 40% markup produces only a 28.6% margin.Read guide →Tactile editorial illustration representing the what if i had invested calculationTrading calculations · 6 min readWhat If You Had Invested? How Historical Return Is CalculatedThis is a backwards-looking scenario, not a claim about what an investor could have achieved in practiceRead guide →Tactile editorial illustration representing the average down calculationTrading calculations · 6 min readHow Averaging Down Changes Your Cost BasisAveraging down combines two purchase lots; it does not erase the loss on the first oneRead guide →Tactile editorial illustration representing the break even price calculationTrading calculations · 6 min readHow to Find a Break-Even Price After Trading FeesBreak-even is the exit price that leaves net profit at zero after costsRead guide →Tactile editorial illustration representing the position size calculationTrading calculations · 6 min readHow to Calculate Position Size: Formula and InputsPosition sizing starts with the loss you are prepared to model, then divides it by the loss per unit between entry and stopRead guide →Tactile editorial illustration representing the roi calculationTrading calculations · 6 min readHow to Calculate ROI: Formula and InputsReturn on investment compares net gain with the amount investedRead guide →Tactile editorial illustration representing the cagr calculationTrading calculations · 6 min readHow to Calculate CAGR: Formula and InputsCAGR compresses a multi-year change into one compounded annual rateRead guide →Tactile editorial illustration representing the compound interest calculationBorrowing & saving · 6 min readHow to Calculate Compound Interest: Formula and InputsCompound growth earns returns on the original balance and on prior returnsRead guide →Tactile editorial illustration representing the dollar cost averaging calculationTrading calculations · 6 min readDollar-Cost Averaging: How the Average Purchase Price WorksDollar-cost averaging buys more units when the price is lower and fewer when it is higherRead guide →Tactile editorial illustration representing the profit margin calculationBusiness fundamentals · 6 min readHow to Calculate Profit Margin from Revenue and CostProfit margin measures profit against revenue, not against costRead guide →Tactile editorial illustration representing the percentage calculationEveryday math · 6 min readThe Four Percentage Calculations People Mix UpThe word percentage covers several different operationsRead guide →