THE WHOLE TOOLKIT

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Digital quantities

Backup retention storage estimate

Backup retention storage estimate: Storage = (full size × retained fulls + daily changes × retained days) × stored-size percentage.

Digital quantities

Database index storage overhead

Database index storage overhead: Estimated bytes = rows × (key bytes + pointer bytes) × overhead factor × index count.

Math & statistics

Conversion-rate sample size

Conversion-rate sample size: Approximate sample per variant = 2 × p̄(1−p̄) × (zα + zβ)² ÷ absolute difference².

Math & statistics

Proportion margin of error

Proportion margin of error: Margin of error in percentage points = z × √(p(1−p)/n) × 100.

Everyday arithmetic

Weighted average purchase price

Weighted average purchase price: Weighted average = total cost across lots ÷ total quantity.

Everyday arithmetic

Percentage points versus percent change

Percentage points versus percent change: Relative percent change = (new − old) ÷ old × 100.

Everyday arithmetic

Ratio recipe and mixture scaling

Ratio recipe and mixture scaling: Scaled amount A = target total × A ÷ (A + B).

Money & borrowing

Paycheck bills and leftover planner

Paycheck bills and leftover planner: Leftover = paycheck minus bills, essentials and planned saving.

Money & borrowing

Monthly sinking fund contribution

Monthly sinking fund contribution: Monthly contribution = remaining target divided by months remaining.

Money & borrowing

Irregular income baseline budget

Irregular income baseline budget: Flexible spending room = conservative income minus fixed costs, essentials and reserve contribution.

Money & borrowing

Annual expenses monthly set-aside

Annual expenses monthly set-aside: Monthly set-aside = annual expenses plus buffer, less savings, divided by months until due.

Money & borrowing

Cash buffer in days

Cash buffer in days: Buffer days = cash divided by monthly essential spending times 30.4375 average days per month.

Money & borrowing

Debt payment share of take-home pay

Debt payment share of take-home pay: Payment share (%) = monthly debt payments divided by take-home pay times 100.

Money & borrowing

Windfall allocation planner

Windfall allocation planner: Displayed debt allocation = windfall times the entered debt percentage after checking all allocations total 100%.

Money & borrowing

Insurance deductible premium recovery

Insurance deductible premium recovery: Claim-free break-even years = deductible increase divided by annual premium saving.

Money & borrowing

Emergency fund rebuild timeline

Emergency fund rebuild timeline: Months to rebuild = remaining target divided by monthly contribution, rounded up.

Everyday arithmetic

Subscription price increase impact

Subscription price increase impact: Additional cost = new price minus old price, multiplied by months kept.

Money & borrowing

Buy now pay later total cost

Buy now pay later total cost: Total cost = purchase plus fees; payment amount = total divided by number of payments.

Money & borrowing

Credit card convenience fee cost

Credit card convenience fee cost: Convenience fee = bill times percentage fee plus fixed fee.

Money & borrowing

Cash-back redemption value

Cash-back redemption value: Net redemption value = points divided by 1,000 times entered value, less the fee.

Everyday arithmetic

Household cost split by custom shares

Household cost split by custom shares: Your contribution = total shared cost times your agreed percentage.

Travel & transport

Vacation savings deadline contribution

Vacation savings deadline contribution: Monthly saving needed = remaining trip budget divided by months until payment.

Business & selling

Landed cost per imported unit

Landed cost per imported unit: Landed unit cost = all acquisition and delivery costs divided by saleable units received.

Business & selling

Recipe cost per batch and unit

Recipe cost per batch and unit: Cost per saleable unit = ingredients, packaging, labour and allocated overhead divided by batch yield.