Quick guide
How to use this calculator
- Enter property amounts from one consistent currency and period.
- Use the labels to match the calculator's stated income, cost, area, or capacity convention.
- Read the assumptions beside the result before using it in an investment comparison.
Calculation method
Calculation method
Rent change = current rent × entered change rate ÷ 100. Revised rent = current rent + rent change.
Entered fixed decimals use exact rational arithmetic. Money rounds only for display; a supported nonzero amount is never replaced by a misleading zero.
Worked example
Worked example
A 3% increase on rent of 1,500 changes rent by 45 to 1,545.
Rent change = current rent × entered change rate ÷ 100. Revised rent = current rent + rent change.
Supported inputs
Precision and limits
Visible input limits
Amounts accept up to 30 digits and 12 decimal places and are capped at 1e12 per input. Rates are capped at 1000%; signed value-change rates cannot be below −100%.
International scope
No currency, tax regime, tenancy law, lender threshold, local market database, appraisal standard, or jurisdiction-specific fee is assumed.
Decision boundary
The result is an arithmetic scenario based on visitor-entered figures, not an appraisal, forecast, lending decision, legal determination, or investment recommendation.
Calculator-specific assumptions
The entered rate may be negative for a decrease. The calculator does not determine whether a change is lawful, permitted by a lease, or subject to notice or rounding rules.