Pro-rata membership calculator
Work out what a member joining part way through the year should pay.
Enter a fee and both dates to see the prorated amount.
Prorated fee
For of days, from to .
- Days elapsed
- Days left
- Daily rate
- Value used
- Value left
- Next renewal
Prorated by whole months instead, counting the joining month in full: .
How the calculation works
The calculator finds the membership period the joining date falls in, counting forward or back from the start date you give it in whole years, quarters or months. For a yearly membership that starts on 1 April, a member joining on 10 September falls in the period from 1 April to the following 31 March.
The full fee divided by the days in that period is the daily rate. The days from the joining date to the end of the period, joining day included, times the daily rate is the prorated fee. A leap year has 366 days, and the calculator counts them.
Some clubs would rather charge by the month, counting the joining month in full. For yearly and quarterly memberships the calculator shows that figure too, so you can compare the two and put the rule in your membership terms.
Straight answers
How do you work out a pro-rata membership fee?
Divide the full fee by the number of days in the membership period to get a daily rate, then multiply it by the days left from the joining date to the end of the period. A £240 annual membership whose year starts on 1 January costs about £0.66 a day, so someone joining on 1 April, with 275 of 365 days left, pays £180.82.
Should a club prorate by the day or by the month?
By the day is the fairest and the easiest to defend, because two people joining a week apart pay different amounts. By the month is simpler to explain and to round: the joining month usually counts as a full month. The calculator shows both so the committee can choose.
What is a membership anchor date?
The date every membership renews on, such as 1 April or 1 January, whatever day each member joined. Anchoring keeps renewals in one batch, and a new member pays a prorated fee for the part of the year that is left.
Does the joining day count as a day of membership?
Yes. The calculator counts the joining day as the first day the member pays for, and the day the period ends as the first day of the next one.
Can I use this for a monthly or quarterly subscription?
Yes. Choose monthly or quarterly and the calculator finds the period the joining date falls in, counting from your anchor date, and prorates within it.
Is the calculator free?
Yes. It is free for any club, syndicate or school to use, with nothing to sign up for. Nothing you enter leaves your browser.
More free tools
Prorated joining fees, worked out for you.
Volanti prorates every new membership against your anchor date and sends the renewal reminders.