The 100 Envelope Challenge, explained (+ free printable)

If budgeting spreadsheets make your eyes glaze over, the 100 Envelope Challenge might be the most fun you’ve ever had saving money. It turns a big, scary number — $5,050 — into a hundred tiny, doable wins.

What is the 100 Envelope Challenge?

You grab 100 envelopes and number them 1 to 100. Each day you pick one and tuck away the matching amount: envelope 1 gets $1, envelope 100 gets $100. Fill them all and you’ve saved $5,050.

How it works, step by step

1. Get 100 envelopes (or use our free printable tracker).
2. Number them 1 through 100.
3. Each day, pick an envelope at random.
4. Add that dollar amount, in cash or to savings.
5. Cross it off and watch the total climb.
6. Repeat for 100 days.

You’re not saving $5,050. You’re saving $1, then $14, then $7. One small envelope at a time.

The math: why it adds up to $5,050

Add every number from 1 to 100 and you always get $5,050 (the tidy formula is n × (n + 1) ÷ 2). The order doesn’t change the total — it all adds up. 💸

Make it work for your real life

• Go weekly instead of daily to finish in under a year.
• Shrink the numbers to cents for a $50.50 no-pressure version.
• Go fully digital — no cash, no clutter.

Quick questions