CPI Calculator for Commercial Lease Rent Reviews - Free Tool
Free Tool: CPI Rent Reviews
Sydney and national CPI data built in. Instant results. No spreadsheet required.
What is a
CPI rent review?
Rent is adjusted using the ABS Consumer Price Index rather than a fixed percentage. The landlord compares the index at two lease-specified dates and applies the change.
Most leases include a cap (maximum increase) or collar (minimum increase). These must be applied correctly or the review is invalid.
Sydney, All Groups, weighted average. Each produces a different number. Using the wrong ABS series is the most common error landlords make.
CPI Rent Review Calculator
Your Exact CPI Rent Increase.
Enter your current rent and lease dates. The calculator uses ABS-published CPI data to compute the exact adjustment, with optional cap and floor controls.
Select the "from" and "to" dates as defined in your lease review clause.
From date
To date
This calculator provides an estimate based on ABS CPI data. Always review your lease agreement and consult a licensed property professional before issuing a rent review notice.
New annual rent
…
per annum (ex. GST)
Applied CPI increase
…
applied to rent
Current rent
…
per annum
Dollar increase
…
per annum
New weekly
…
per week
New monthly
…
per month
Review period
…
from → to
CPI series
…
ABS Cat 6401.0
This calculation is indicative only. Always verify the CPI index dates against the specific wording in your lease. BLOX Commercial accepts no liability for reliance on this tool without professional confirmation.
What landlords need to check
- Check your lease clause first. CPI, fixed percentage, and market review each have different rules and notice requirements.
- Know your cap and floor. Many commercial leases cap annual CPI increases at 4 or 5 percent. The calculator above handles caps if you tick the box.
- Serve written notice in the right window. Most leases require 30 to 60 days written notice before the review date. Miss it and you lose this cycle's increase.
- Confirm the ABS index your lease specifies. Sydney All Groups, Australia All Groups, and Capital City Weighted Average each produce different numbers. The wrong series invalidates the review.
- Retail leases follow the Retail Leases Act 1994 NSW. Section 18 restricts the frequency and structure of retail rent reviews. Commercial (office, industrial) leases are not bound by the Act.
What tenants need to check
- Verify the index your lease specifies. Sydney vs Australia vs All Groups Weighted can each return a different figure.
- Check the quarters exactly. CPI is published quarterly. The from and to quarters in the landlord's calculation must match the dates in your lease.
- Know whether a cap protects you. Many leases cap increases at 4 or 5 percent. If the landlord's notice exceeds the cap, push back in writing.
- Request the source ABS publication. You're entitled to see the data your landlord is relying on (ABS Cat 6401.0).
- Retail tenants have extra protections. The Retail Leases Act 1994 NSW limits market reviews and outgoings recovery.
- Don't accept a verbal result. Everything goes in writing, including the calculation breakdown and the index numbers used.
Want us to manage this review for you?
Send your results to our team and we will confirm the calculation against your lease and handle the formal notice.
Want the Blox team to verify your number?
Fill in your details and the Blox team will be in touch.
Want the Blox team to verify your number?
Fill in your details and the Blox team will be in touch.
Want the Blox team to verify your number?
Fill in your details and the Blox team will be in touch.
Want the Blox team to verify your number?
Fill in your details and the Blox team will be in touch.
Want the Blox team to verify your number?
Fill in your details and the Blox team will be in touch.
Want the Blox team to verify your number?
Fill in your details and the Blox team will be in touch.
Want the Blox team to verify your number?
Fill in your details and the Blox team will be in touch.
Want the Blox team to verify your number?
Fill in your details and the Blox team will be in touch.
Want the Blox team to verify your number?
Fill in your details and the Blox team will be in touch.
Want the Blox team to verify your number?
Fill in your details and the Blox team will be in touch.
Want the Blox team to verify your number?
Fill in your details and the Blox team will be in touch.
Want the Blox team to verify your number?
Fill in your details and the Blox team will be in touch.
Want the Blox team to verify your number?
Fill in your details and the Blox team will be in touch.
GET A FREE CPI CLAUSE CHECK.
Send us the relevant lease clauses and we'll confirm whether the review was calculated correctly.
Market rent reviews
Is it a market review?
Let us negotiate it.
A market review sets rent based on what comparable space leases for today, not an index. It requires research, comparable evidence, and a negotiation with your tenant.
We assess current market conditions, prepare a formal rental determination, and negotiate the new rate directly with your tenant. You keep the relationship. We do the work.
We pull comparable lease transactions for similar property types and locations to establish a defensible market rent range.
A formal written rental determination with supporting evidence, structured to hold up if the tenant disputes the outcome.
We engage directly with your tenant or their representative to agree on the new rate. You stay out of the conversation.
Data transparency
CPI data embedded in this tool.
The calculator uses ABS-published quarterly index numbers. Last 12 quarters, updated when new ABS data is released.
Source: ABS Cat 6401.0 via the ABS Data API. Most recent data: March 2026 quarter (Sydney All Groups CPI and Australia All Groups CPI, rebased reference period 2024-Q4 to 2025-Q4 = 100). All values are official ABS figures.
Common mistakes
What can go wrong with
a CPI rent review.
The ABS publishes multiple CPI series. Your lease will specify which one applies. Using Sydney All Groups when the lease says National, or selecting the wrong quarter, produces a different index ratio and a different rent figure. The error compounds every review.
The "from" and "to" dates must match the review dates specified in your lease. Using the wrong base quarter produces a different CPI ratio and a different, possibly incorrect, rent.
A cap clause limits how much rent can increase in a high-inflation year. During 2022-2023, when national CPI exceeded 7%, a 5% cap meant landlords absorbed the difference.
What our clients say
What landlords say
about us.
"Blox picked up a CPI review we'd missed for 18 months. They recovered $8,400 in arrears and now manage every review date. Can't recommend highly enough."
Michael T. · Commercial Landlord
"We had no idea our tenant had been underpaying for two years. Blox found the shortfall, issued the notices correctly, and handled everything."
Sarah K. · Property Owner
"The data confirmed what I suspected. Blox handled the entire review process. Professional, fast, no issues with the tenant."
David R. · Commercial Landlord
Results may vary. Reviews based on actual client feedback.
Need someone to run your
rent review correctly?
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