31 Day Calendar Fundraiser: How Much Money Can You Raise?

Short answer: A fully claimed 31-day calendar fundraiser raises $496 per participant. That's 1 + 2 + 3 + ... + 31 = $496.

This post breaks down where that number comes from, what realistic completion rates look like, and how groups stack participants to push total revenue into five and six figures.

The math: why exactly $496?

A 31-day pick-a-date calendar has one date for every day of the month, with the dollar amount matching the date. Day 1 costs $1. Day 15 costs $15. Day 31 costs $31. When a participant's calendar is fully claimed, the total raised is the sum of every integer from 1 to 31.

The arithmetic series formula gives the exact answer: n × (n + 1) / 2, with n = 31. So 31 × 32 / 2 = $496. Every fully claimed calendar raises the same amount, regardless of which order dates are claimed.

Realistic earnings per participant

Few participants fully claim every single date. Most campaigns see completion rates between 60% and 85%. Here's a quick translation:

• 100% claimed: $496 (math max)
• 85% claimed (great): ~$422
• 75% claimed (typical good): ~$372
• 60% claimed (modest): ~$298

If a participant fills the high-dollar dates (25th–31st) but skips a few low-dollar ones, their total is still close to $496 because the bulk of revenue is in the back half of the calendar.

Earnings by participant count

Participants	100% claimed (max)	75% realistic
1	$496	$372
10	$4,960	$3,720
25	$12,400	$9,300
50	$24,800	$18,600
100	$49,600	$37,200
200	$99,200	$74,400

The format scales linearly with participants — that's its single biggest advantage. A school doesn't need 5,000 donors. It needs 50 motivated participants who each ask 10–20 people for small donations.

How to push revenue past the standard $496

Three practical levers:

1. Multiple calendars per participant. Some groups run a calendar in October and another in March. Same participants, double the revenue.

2. Multi-month calendars. Run a 60-day calendar with prices $1–$60. Total = $1,830 per fully claimed calendar. (Most groups stick with 31 days because it's a familiar mental model for donors.)

3. Donor bonuses. Add a "donate $50 to claim any premium date" tier on top of the standard $1–$31. Power donors love a way to give more.

4. Class or team challenges. Groups with 4+ classes/teams often see a 15–30% bump from leaderboard competition.

What it costs to actually collect that money

On CalendarFundraiser, we take $0 out of your donations — you keep 100%. Donors pay a small service fee at checkout (a few dollars based on the gift size), so your organization receives the full donation. Your payment processor (Stripe, Square, or PayPal) charges its own standard rate — for example, PayPal's ~3.5% + $0.49 leaves about $472 on a fully claimed $496 calendar.

There's no percentage taken from your donations, and donations deposit directly to your own Stripe, Square, or PayPal account — no waiting on platform payouts.

Start your 31 day calendar fundraiser

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Or read how to run a digital pick-a-date calendar fundraiser for the full launch playbook.