Full instructions for using this Rent and Mesne Profits Calculator, and important legal notices, are further down this page.
Step 1 - Choose the date of the first missed instalment of rent
Select the starting date of your choice using the popup date selection window. When you first open the Rent Calculator, the date is automatically set to today's date. As the calculator takes today's date from your system clock, it is important to make sure that your system date is correctly set for this function to work properly.
Step 2 - Choose your ending date
Select the ending date of your choice using the popup date selection window. When you first open the Rent Calculator, the date is automatically set to today's date. As the calculator takes today's date from your system clock, it is important to make sure that your system date is correctly set for this function to work properly.
Step 3 - Enter the amount of each instalment of rent
You should not enter any currency sign, nor should you enter any commas in the number.
Step 4 - Select the period for the payment of rent
Select the period for the frequency with which rent is due (daily, weekly, etc.). Further information is available on the "usual quarter days" and see also the Historical Note on Quarter Days at the bottom of this page.
Step 5 - Calculate
Press the button marked "Calculate" to carry out the calculation. In the lower part of the form will be displayed the number of instalments of rent which have been missed, the total of the current arrears (rounded to two decimal places) and the daily rate at which arrears continue to accrue (again rounded to two decimal places).
Method of calculation:
The answers above include the instalment of rent due on your chosen starting date (step 1 above) and also any instalment of rent which may fall due on your chosen ending date (step 2 above). The continuing daily rate is calculated by taking the equivalent annual amount of rent and dividing by 365, except in the case of rent due weekly where it is calculated by dividing the weekly instalment of rent by 7. It makes no difference to the calculation itself whether rent is payable in advance or in arrears, although you should bear in mind that where the rent is payable in arrears you will need to use the continuing daily rate if you wish to calculate the total sum due to the present day since the last instalment of rent fell due.
(1) Where the starting date exists in the starting month but not in the ending month (e.g. a
calculation from 31 January to 30 September), then for the purpose of monthly and six
monthly calculations the calculator assumes that another full month has accrued if the
ending date is the last day of the ending month. So, for example, 31 January to 30
April is four instalments of monthly rent (i.e. it includes the April instalment) but 31
January to 29 April is only three instalments of monthly rent (i.e. it excludes the April
(2) No equivalent correction is needed or made when the calculation goes from a shorter month to a longer one. So, for example, 30 April to 30 May is two instalments of monthly rent (i.e. it includes the May instalment) regardless of the fact that other days still remain in May.
(3) The above points take account of leap years. In other words, the last day of February for these purposes is normally the 28th but in a leap year would be the 29th.
(4) An equivalent problem occurs in respect of annual calculations but only when the date of the first missed instalment is 29 February (an unlikely scenario). In these circumstances the calculator assumes that another full year from 29 February has accrued if the ending date is 28 February in a normal year or 29 February in a leap year.
(5) Again, no correction is made if the first missed annual instalment is 28 February. In other words, the annual instalments would always be treated as falling due on 28 February regardless of whether the ending year is a leap year or not.
Year 2000 compliance. This calculator is year 2000 compliant, assuming that the system on which it is used is also year 2000 compliant. In other words, it works for dates before, after, in, and spanning, the year 2000.
Disclaimer. Every effort has been made to ensure that this calculator functions correctly, and members of Chambers themselves use it. However, no liability can be accepted for any errors which might arise in its operation, and use is entirely at the user's risk.
Copyright. © 2002-. Copyright in this calculator vests in the Head of Chambers for the time being of New Square Chambers, aside from much of the code for the popup date selection routines, for which we are grateful to the excellent former irt.org library. Insofar as the irt.org code has been modified for use in this calculator, the modified code is © the Head of Chambers for the time being of New Square Chambers. However, this calculator is freeware and may be used on this website without charge for any commercial or non-commercial purpose.
Feedback. If you have any comments (whether good or bad) on this calculator or if you spot any errors, New Square Chambers would be only too pleased to hear about them. Please e-mail us. Thank you.
Dating by reference to festivals was common in mediaeval times. See, for example, C.R. Cheney (ed.), Handbook of Dates for Students of English History, Royal Historical Society, 1945, page 40:
Even within surviving law reports, there are reported cases going back to the beginning of the seventeenth century in which the usual quarter days are referred to as being "usual" (see, for example, Wm. Clun's Case, 10 Co. Rep. 126b).
The Annunciation (25th March) used to be the first day of the year before the reformation of the English calendar by the Calendar (New Style) Act 1750. With the start of the new year being a natural choice for the payment of rent, it is likely that the other festivals became usual merely because they were at convenient intervals of roughly one quarter each.
The English calendar was fundamentally restructured by the Calendar (New Style) Act 1750, 24 George 2, c. 23 (as amended by the Calendar Act 1751, 25 George 2, c. 30). The 1750 Act was entitled "An Act for regulating the Commencement of the Year, and for correcting the Calendar now in Use". Section I of that Act provided that:
Section VI of that Act went on to provide:
The old practice was therefore preserved in spite of the calendar being altered so that the first day of the year was now 1st January rather than 25th March. This practice has persisted to date so that even many twenty-first century commercial leases are drafted so that rent is payable on the usual quarter days. Some other jurisdictions, including Scotland, have altered the usual quarter days by statute so that they fall on days which appear more sensible and memorable to modern minds, but no such thing has been done in England.
© 2000 to
Head of Chambers of New Square Chambers