From inputs to an estimate
Every model begins with named inputs and a disclosed formula or step-by-step method. We show a prefilled example so a visitor can inspect a result immediately, then edit price, income, costs, dates or rates. Some models expose alternative conventions, such as day counts or allocation weights. The selected convention is part of the answer, so compare scenarios using the same assumptions.
Boundaries and numerical handling
Inputs have explicit units and bounds where appropriate. Invalid combinations show an error instead of a plausible-looking result. A rate with a zero denominator has no finite value; the interface labels that case. Currency and percentages are rounded for display after calculation. Small differences from a spreadsheet can arise from displayed rounding, selected dates or day-count conventions. The formula and worked example on each calculator page make those differences traceable.
Sources and decisions
We link primary reference material for definitions and transaction context. A reference to a tax publication, underwriting guide or appraisal formula does not validate an individual forecast. Market rent, financing terms, taxes, local rules and a contract’s actual language must be established separately. Read sources and updates for the reference list, and use the contact page to report a calculation that does not match its displayed method.