Irish Calculators
Property

Commercial Rent from Floor Area Calculator

Turn a quoted unit rent and lettable area into a rent budget with separate charges and tax. The quote supplies the tax treatment; the tool does not infer turnover-rent or lease-escalation clauses.

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Your numbers

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How the calculation works

Commercial rent quotations often use a price per square metre or square foot per year, while cash budgets need monthly totals. This calculator converts the quoted area-based rent to a monthly amount, adds supplied monthly charges and applies one entered VAT rate to both components.

Monthly base rent = area × quoted unit rent / 12 for annual quotes, or area × unit rent for monthly quotes. Add charges, then the entered VAT.

  1. Calculate the base rent

    Multiply the lettable area by the quoted rent per area unit. The quote period determines whether that product is already monthly or must be divided by 12.

  2. Add monthly occupancy charges

    Add the entered monthly charges to base rent to form the excluding-VAT monthly subtotal. These are known budget items; the calculator does not assess business rates or discover lease charges.

  3. Apply VAT and annualise

    The supplied percentage is applied to the full subtotal. The inclusive monthly amount is multiplied by 12 to show the corresponding annual budget under unchanged assumptions.

Worked example: Annual area quote

Sample inputs demonstrate the method. They are not a forecast or product offer.

The example uses 100 square metres at €120 per square metre per year: €12,000 annually, or €1,000 monthly. Adding €100 charges gives €1,100 before VAT. Entered VAT of 20% adds €220, producing €1,320 monthly and €15,840 annually.

Lettable area
100
Area and quote unit
Square metres
Quoted rent per area unit
120
Quote period
Per year
Other monthly charges excluding VAT
100
Entered VAT rate on rent and charges
20

Expected result

Monthly base rent
€1,000.00
Monthly total including entered VAT
€1,320.00
Annual total including entered VAT
€15,840.00
Worked example: Monthly area quote

Sample inputs demonstrate the method. They are not a forecast or product offer.

Lettable area
50
Area and quote unit
Square feet
Quoted rent per area unit
2
Quote period
Per month
Other monthly charges excluding VAT
0
Entered VAT rate on rent and charges
0

Expected result

Monthly base rent
€100.00
Annual total including entered VAT
€1,200.00

Understanding your result

The result supports a recurring occupancy budget from a specific quotation. It does not establish a market rent, compare lease incentives or calculate future rent reviews and escalation.

The annual figure is twelve identical monthly totals. A rent-free period, partial first month or exceptional charge will require a separate adjustment rather than being inferred from the quotation.

Questions you might have

Why does the annual or monthly selector matter?

A quote of €250 per square metre per year must be divided by 12 to obtain a monthly amount.

Choosing the right inputs

Area and quote unit
Match the area unit to the unit used in the quotation. Selecting square feet does not convert an area entered in square metres; both the area and the quoted price must already use the selected basis.
Quote period
Identify whether the unit rent is quoted per year or per month. Annual unit rent is divided by 12 after multiplication by area; a monthly quote is not divided again.
Other monthly charges excluding VAT
Enter additional monthly charges excluding VAT. Convert annual service charges to monthly amounts first, and avoid including a charge already built into the quoted unit rent.
Entered VAT rate on rent and charges
Use the VAT percentage applicable to this scenario. It is applied to rent and charges together. Differently taxed components need a separate calculation rather than a blended legal assumption.

Common mistakes to avoid

  • Do not interpret a per-year quotation as a per-month figure.
  • Do not treat a zero VAT entry as confirmation that the lease is legally exempt.

Assumptions to check

  • Tax treatment comes from the quote; zero VAT is a scenario, not an assertion that a lease is exempt.

Sources and method

Read our calculation and testing approach.