Guides
The reasoning behind the calculators, written to be useful on its own.
What Is an Insurance Deductible?
A deductible is the part of a covered claim you pay before the insurer pays anything. It is the main lever for lowering a premium - and the main reason a claim can still hurt.
How Insurance Premiums Are Calculated
A premium is a base rate multiplied by rating factors, reduced by discounts, plus fees and tax. Knowing the structure tells you which parts are negotiable.
How Much Insurance Coverage Do I Need?
Coverage amounts should come from adding up obligations, not from a multiple of income. Here is what belongs in the calculation and what does not.
How Billable Hours Work
Billable hours are the unit most legal work is priced in. Understanding increments, utilisation and realisation explains why a full working day rarely produces a full day of billed time.
How Legal Deadlines Are Calculated
Deadline counting looks simple and is governed by rules that differ by jurisdiction, court and rule type. The arithmetic is easy; identifying which rule applies is the hard part.
Legal Fee Structures Explained
Each fee structure allocates risk between the firm and the client differently. Understanding which risk you are taking on is more useful than comparing headline rates.
How Mortgage Amortization Works
A fixed payment that never changes is split between interest and principal in proportions that change every month. Understanding that split explains most of what is confusing about long loans.
APR vs Interest Rate
The interest rate determines the payment. The APR folds fees into a rate so two offers with different fee structures become comparable - as long as the terms match.
How Lenders Assess Affordability
Affordability is decided primarily by a ratio capping total monthly debt against gross income - but the ratio is one gate among several, and the maximum is not a target.
How Position Sizing Works
Position size is a division: the amount you are willing to lose, divided by the distance to the stop. Everything else - conviction, available capital, leverage - is decoration.
Understanding Risk of Ruin
A positive edge only pays if the account survives long enough to collect it. Risk of ruin measures whether the position size makes that survival likely.
Why a Trading Journal Matters
Memory compresses losses, keeps winners vivid, and quietly deletes the trades taken outside the plan. A written record is the only correction, and it has to include the decision as well as the result.
Utilization, Realization and Collection
A standard rate is what a firm charges. What it actually earns per hour worked is that rate after three separate reductions, each measured by a different ratio.
Why Drawdowns Need More Than They Took
A loss and its recovery are not symmetric. The gain required to get back to even is always larger than the loss that created the hole, and the gap widens sharply as the hole deepens.
How Debt-to-Income Is Measured
Debt-to-income looks like a simple fraction and is mostly a question of definitions. What goes into each side is what makes a lender's answer differ from the one a borrower calculates at home.
How Coinsurance Penalties Work
A coinsurance clause turns underinsurance into a proportional reduction of every claim. The arithmetic is simple, and its consequences are larger than most policyholders expect.
How a Retainer Is Drawn Down
A retainer is an advance against fees, not a payment for them. The distinction governs where the money sits, when it becomes the firm's, and what happens to whatever is left.
What Expectancy Tells You That Win Rate Does Not
Win rate answers how often, and says nothing about how much. Expectancy combines both into a single number that describes the average outcome per unit of risk.
What PMI Is and When It Comes Off
PMI protects the lender, is paid by the borrower, and ends on rules that are worth knowing in advance because one of them requires the borrower to ask.
What Replacement Cost Actually Means
A home is insured for what it would cost to rebuild, not for what it would sell for. Confusing the two is the single most common reason a settlement comes back smaller than expected.