The 100 envelope challenge turns saving into a game of chance. You label 100 envelopes, draw one at random each day, and save whatever number is on it. Finish all 100 and you have saved a fixed, satisfying lump sum.
How the 100 envelope challenge works
- Number 100 envelopes from 1 to 100.
- Draw one at random each day (a shuffled pile or a jar works well).
- Save the amount written on it — pull envelope 37, save 37.
- Set the filled envelope aside and repeat until all 100 are done.
The randomness is the fun part: some days are easy, some sting a little, and you never know which is coming.
The total you'll save
Because every envelope from 1 to 100 gets filled exactly once, the total is fixed:
1 + 2 + 3 + … + 100 = (100 × 101) ÷ 2 = 5,050
Finish the challenge and you've saved 5,050 in your currency — from a plan where no single day ever asks for more than 100.
Faster and slower variations
| Pace | Envelopes per day | Finish in |
|---|---|---|
| Relaxed | ~1 (5 a week) | ~20 weeks |
| Standard | 1 a day | 100 days |
| Sprint | 2 a day | 50 days |
Tip: draw two envelopes daily — one high, one low — to smooth out the expensive days and keep the pace steady.
The digital, no-cash version
You don't need real envelopes or cash lying around. Keep a numbered checklist, pick an unused number each day, and move that amount into a separate savings account. This is exactly how a daily tracker works — the “draw” is just a shuffled order of amounts.
In fact, the 365-day savings challenge is the same idea stretched across a full year with a much bigger finish. If you like the envelope game, you'll like that too.
How to actually finish it
- Draw at the same time each day so it becomes a ritual, not a chore.
- Bank the money immediately — a filled envelope you spend isn't saved.
- Keep the big numbers for good days. If you can choose, save large amounts when cash flow allows and small ones when it's tight.
Want a routine that outlasts the 100 days? See how to save money every day.
Frequently asked questions
How much do you save with the 100 envelope challenge?
If you number envelopes 1 to 100 and save the amount on each one, the total is 5,050 (100 × 101 ÷ 2). Every envelope gets filled exactly once, so the final figure is fixed no matter what order you draw them in.
How long does the 100 envelope challenge take?
Drawing one envelope a day, it takes 100 days — a little over three months. You can go faster by drawing several a day, or slower by doing a few a week; the total stays 5,050 either way.
Can I do the 100 envelope challenge without cash?
Yes. The envelopes are just a fun way to randomise the amount. You can keep a numbered checklist and transfer the drawn amount to a savings account instead — a digital tracker does exactly this without any physical cash.
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