How to Calculate Simple Interest in Excel and Google Sheets
Build a simple-interest worksheet in Excel or Google Sheets with percentage inputs, time bases, reusable references, and independent checks.
FinanceThe Rule of 72: Estimating How Long Money Takes to Double
Use the Rule of 72 to estimate doubling time, then compare it with logarithmic compound-growth math. Check units, deposits, inflation, and approximation error.
FinanceCompound Interest With Withdrawals: How Balances Change
Model fixed withdrawals with a compound-growth recurrence. Compare beginning and end timing, reconcile earnings, and stop at the funded-plan boundary.
FinanceHow to Calculate Compound Interest in Excel and Google Sheets
Build compound-interest formulas in Excel or Google Sheets using matched rate periods, FV signs, deposit timing, and balance reconciliation.
FinanceHow to Calculate an Emergency Fund Savings Goal
Build an expenses-based emergency-fund worksheet with chosen coverage periods, available reserves, and monthly saving scenarios, without one universal target.
FinanceWeekly vs. Monthly Savings: Comparing Contribution Schedules
Compare weekly and monthly saving with equal annual contributions. Check deposit counts, timing, rate units, and why four weeks is not a month.
FinanceHow Much Interest Will My Savings Earn?
Separate savings interest from opening money and new deposits. Work through constant-yield examples, cash-flow timing, and savings-goal model limits.
FinanceInvestment Return vs. Account Growth: Why Deposits Are Not Profit
Reconcile investment account growth with deposits, withdrawals, and net gain. Learn why a larger ending balance does not establish a positive investment return.
FinanceArithmetic vs. Geometric Investment Returns: Why Averages Differ
Compare arithmetic and geometric investment returns with gain-and-loss paths. Reconcile compounded balances and see why cash-flow timing matters.
FinanceDividend Reinvestment: How It Changes Investment Growth
Track dividends taken as cash versus reinvested shares using a transparent ledger. Avoid double-counting distributions in total-return investment projections.