Real estate calculator
Editor
Estimate a percentage, flat-dollar, or CPI-based rent adjustment in the same calm Toolistri layout. The summary, annual comparison, and breakdown update live as you edit.
Keep the current rent, increase method, and timing visible immediately so the calculator stays quick to use.
Current rent
Use the monthly rent before the adjustment takes effect.
Increase method
Choose the adjustment style used in your scenario.
Percentage increase
Use this when the rent is increasing by a simple percentage.
Timing
The effective date is optional and only changes the summary language, not the math.
Only open this when you need optional CPI caps or floors.
Results
New monthly rent
$1,890.00
Monthly change
+$90.00
Added annual cost
+$1,080.00
Current monthly rent
$1,800.00
Adjusted monthly rent
$1,890.00
Applied change
+5%
Annual rent before
$21,600.00
Annual rent after
$22,680.00
Annual difference
+$1,080.00
Method used
Percentage increase
Effective date
May 1, 2026
Current annual rent
$21,600.00
Adjusted annual rent
$22,680.00
| Measure | Current | Adjusted | Change |
|---|---|---|---|
| Monthly rent | $1,800.00 | $1,890.00 | +$90.00 |
| Annual rent | $21,600.00 | $22,680.00 | +$1,080.00 |
| Applied change | 0% | 5% | +5% |
Legal notice requirements, rent-control limits, caps, and lease rules vary by location and agreement. Use this page to estimate the math of a rent adjustment, then review local law and lease language if you need compliance guidance.
How it works
Start with the current monthly rent, choose an adjustment method, and enter the matching increase inputs. The calculator then estimates the new monthly rent, the monthly difference, and the full-year impact from that change.
Many scenarios use a simple percentage increase, a flat monthly dollar increase, or a CPI-based lease adjustment. This calculator supports all three so you can compare the most common practical approaches in one consistent layout.
A percentage increase scales with the current rent, while a flat-dollar increase adds the same monthly amount regardless of the starting rent. The calculator converts both into a clear before-and-after comparison so the impact is easier to scan.
CPI-based adjustments start with the percentage change between two CPI index values. That percentage is then applied to the current rent. Some leases also add caps or floors, which this calculator shows separately so the applied result stays transparent.
A monthly change can look small until you spread it across a full year. That is why the results dashboard always shows the annual rent before, the annual rent after, and the annual difference alongside the monthly change.
This page estimates rent-adjustment math only. It does not determine whether a rent increase is legal, whether notice timing is sufficient, or whether a local rent-control rule applies in your location.
Start with the current monthly rent, then apply the increase method being used. A percentage increase multiplies the current rent by one plus the percentage rate, while a flat increase simply adds a monthly dollar amount.
Multiply the current monthly rent by 1.05. For example, if rent is $1,800, a 5% increase raises it to $1,890 and adds $1,080 over a full year.
Yes. A flat-dollar increase adds the same amount each month, while a percentage increase rises in proportion to the current rent. The difference becomes more obvious at higher or lower starting rents.
CPI rent adjustments use the percentage change between an older and newer CPI index value. Some leases also limit the result with a cap or prevent decreases with a floor, which this calculator can model.
No. It only estimates the math of a rent adjustment. Local law, notice periods, rent-control rules, and lease language vary too much for this calculator to act as a legal compliance checker.
The annual impact is the new monthly rent minus the current monthly rent, multiplied by 12. The results dashboard shows that yearly change automatically so you do not have to calculate it by hand.
This calculator provides rent-adjustment estimates only. Legal notice requirements, caps, rent-control rules, and lease escalation terms vary by location and agreement. Review local law and the lease language directly if you need compliance guidance.
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