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Calculate your Nonprofit Donors' Lifetime Value

Every donor has a lifetime. They come, they donate, and they eventually leave.

Combining how much a new donor costs, with how much they donate and how long they stay gives you a donor’s lifetime value. The value of your donor base, the amount of impact you can have, is the combined DLV of all donors—current and future.

By comparing the two, we can tell how sustainable our donor relationships are and where you need to optimize for better donor relationships.

What you get

Measuring DLTV can be done in various ways, but we find our method to be the most effective. In this Nonprofit Donor LTV calculating tool, you will find your:

  • Average Revenue Per Donor (ARDP) is the expected annual donation of a single donor.
  • Churn is the percentage of donors that do not give again. It measures the percentage of donors you lost over a given period.
  • Donor Acquisition Cost (DAC) is the average cost of adding a new donor.

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DLTV Calculator

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DLTV showcases your ability to increasingly deepen a donors' commitment to your nonprofit.

Trusted by Leading Nonprofit Organizations


What I loved about Harness was the emphasis on relationships from the beginning of the donation process.

Carey Dougherty

Malta House


The Harness platform has opened up a whole new channel for us to connect with our supporters!

Daniel Hall

Boys & Girls Club


The user experience from both a donor and admin standpoint is fast, intuitive, and powerful!

Pam Fulk

Carolina Tiger Rescue