Net Effective Rent Calculator
Work out what a lease with free months really costs per month, and what the rent becomes at renewal.
Every figure below is labelled in the currency you pick. Amounts are not converted — enter values in the same currency.
The renewal is the catch
Two months free on a twelve-month lease at $2,000 makes the effective rent $1,667 — but the lease still says $2,000, and that is the figure the renewal increase is calculated from. A building that advertises net effective rent is telling you what you pay this year, not what you pay next year.
The formula
Net effective rent = advertised rent × (term − free months) ÷ term
Every result on this page comes from this formula. Nothing is rounded until the final display, so figures match a spreadsheet to the cent.
How to use the Net Effective Rent Calculator
- Fill in each field with your own figures — the defaults are only there as an example.
- The result updates as you type, so there is no button to press.
- Check the breakdown under the main result for the supporting numbers.
- Use the copy button to take the result with you, or share the link to reload the same inputs.
Net Effective Rent Calculator — frequently asked questions
Is this net effective rent calculator free to use?
Yes. Every calculator on the site is free, needs no sign-up, and runs entirely in your browser, so your figures never leave your device.
How accurate is the result?
The maths is exact for the formula shown on the page. Accuracy in the real world depends on your inputs and on assumptions the formula cannot see, so treat the output as a well-grounded estimate rather than a quote.
Can I use it on my phone?
Yes. The page is responsive, weighs a few kilobytes and works offline once loaded, so it behaves the same on a phone as on a desktop.
What people search for
This page answers each of these searches. They are the exact phrases visitors use to find the net effective rent calculator.
- net effective rent calculator
- what am i really paying in rent
- rent concession calculator
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- free month rent calculator
About this calculator
Written and reviewed by The Samsung Calculator editorial team. Every calculator is written against a published formula, reviewed against at least one independent reference implementation, and dated when it changes.
Last reviewed August 23, 2026 · Calculation runs client-side · No data collected · Report an error