Recurring giving calculator.
Explore what a monthly gift can add up to for a donor and model a monthly giving program with your own growth and cancellation assumptions. The exportable month-by-month result is a planning scenario, not a forecast.
For a donor: what a monthly gift becomes
1 year
$300
3 years
$900
5 years
$1,500
10 years
$3,000
$25 a month is $300 in a year — $200 more than the one-time gift, and it passes it in month 4.
For your organization: a monthly giving program
Total raised in 24 months
$55,866.18
Monthly donors at the end
127
Monthly revenue at the end
$3,171.10
Donors gained / lost
120 / 43
| Month | Donors | Monthly revenue | Cumulative |
|---|---|---|---|
| 1 | 54 | $1,350 | $1,350 |
| 3 | 62 | $1,544.04 | $4,342.04 |
| 5 | 69 | $1,730.40 | $7,710.60 |
| 7 | 76 | $1,909.37 | $11,440.76 |
| 9 | 83 | $2,081.26 | $15,518.20 |
| 11 | 90 | $2,246.34 | $19,929.18 |
| 13 | 96 | $2,404.89 | $24,660.49 |
| 15 | 102 | $2,557.15 | $29,699.43 |
| 17 | 108 | $2,703.39 | $35,033.83 |
| 19 | 114 | $2,843.84 | $40,651.99 |
| 21 | 119 | $2,978.72 | $46,542.67 |
| 23 | 124 | $3,108.26 | $52,695.08 |
| 24 | 127 | $3,171.10 | $55,866.18 |
Put this recurring giving calculator on your website
Paste the two lines below wherever your site accepts HTML — a Custom HTML block in WordPress, a Code block in Squarespace, an Embed element in Wix or Webflow. It sizes itself to fit and stays up to date automatically. A small “Free tool by KindLumen” line stays at the bottom.
<div data-kindlumen-inline="https://www.kindlumen.com/embed/tools/recurring-giving-calculator"></div>
<script async src="https://www.kindlumen.com/embed/widget.js"></script>Live preview on a sample page
Offer monthly giving in the same form.
KindLumen forms can offer one-time and monthly giving when a verified Stripe account is connected. Stripe manages enabled subscriptions on your account; retry behavior follows your Stripe Billing settings, and donor self-service depends on the management options you provide. Free, no platform fee.
Recurring giving calculator questions.
Why do monthly donors matter so much?
A recurring schedule can turn a modest monthly amount into meaningful cumulative support: $25 a month is $300 over one year and $1,500 over five years before cancellations or payment failures. Use the calculator to compare that pattern with a one-time gift.
How should I read the program projection?
It starts with your current monthly donors and average gift, adds the new donors you assume will sign up each month, and removes the share you assume will cancel or stop paying. Treat the result as a planning scenario, not a forecast, and compare several assumptions drawn from your own donor records.
What is a reasonable churn rate?
There is no single rate that fits every organization. Calculate yours consistently from your own records—for example, donors who leave during a month divided by active monthly donors at the start—and compare multiple periods. Decide whether cancellations and payment failures are combined or tracked separately before using that rate here.
What is the “impact unit”?
A way to translate money into something concrete for donors: if $60 provides a week of meals, the calculator shows how many weeks of meals a monthly gift funds over time. Use your own numbers.
How do I start a monthly giving program?
Connect a verified Stripe account and enable monthly giving on the KindLumen form. Stripe manages the subscription on your connected account. Automatic retry behavior depends on that account’s Stripe Billing settings, and donor self-service depends on the management options you make available.
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