---
title: "Calculate pro-rata charges for membership upgrades"
slug: "calculate-pro-rata-charges-for-membership-upgrades"
updated: 2026-06-16T16:34:06Z
published: 2026-06-16T16:34:06Z
canonical: "mysupport.roller.software/calculate-pro-rata-charges-for-membership-upgrades"
---

> ## Documentation Index
> Fetch the complete documentation index at: https://mysupport.roller.software/llms.txt
> Use this file to discover all available pages before exploring further.

# Calculate pro-rata charges for membership upgrades

When upgrading or downgrading a membership, ROLLER uses the following formula to calculate the one-off, pro-rata amount charged or credited to the guest:

![pro-rata.png](https://cdn.us.document360.io/23700755-951c-4b69-8afe-ec8b33c6c689/Images/Documentation/360003287055.png)

**Where:**

- **Unit.cost1** is the unit cost of the membership that is being upgraded.
- **Unit.cost2** is the unit cost of the new membership.
- **Billing.period.length** is the current recurring billing period. For non-recurring passes, the billing period length is 1.

For recurring memberships, the billing period length is defined as:

![Screen_Shot_2020-01-28_at_11.00.14_am.png](https://cdn.us.document360.io/23700755-951c-4b69-8afe-ec8b33c6c689/Images/Documentation/360003381636.png)

**Example:**

A guest wants to upgrade their membership from a $20p/m to a $30p/m membership. If the guest upgrades halfway through a billing cycle they will have to pro-rata $5 immediately and then begin paying $30p/m upon their next scheduled payment.

[Embedded content](https://fast.wistia.com/embed/iframe/kdn3h0l3o0)

## Related

- [Upgrade and downgrade memberships at POS](/upgrade-and-downgrade-memberships-at-pos.md)
- [Upgrade a non-membership product to a membership at POS](/upgrade-a-non-membership-product-to-a-membership-at-pos.md)
- [Encourage guests to self-serve membership upgrades, renewals and cancellations](/encourage-guests-to-self-serve-membership-upgrades-renewals-and-cancellations.md)
- [Manage payments for recurring memberships](/manage-payments-for-recurring-memberships.md)