Savings Challenge Calculator (52-Week, Penny & Custom)
Plan a 52-week money challenge, penny challenge or your own savings challenge: total saved, deposit schedule with dates, and running totals.
A savings challenge turns saving into a schedule: you deposit a set amount each day, week or month, usually a little more each time. The best-known version is the 52-week money challenge, where you save $1 in week one, $2 in week two and so on to $52, ending with $1,378. This calculator handles that and any variation, and prints a dated deposit schedule you can follow or tick off.
How to use this tool
- Enter the first deposit and how much each deposit should grow (0 for a flat amount).
- Enter the number of deposits and how often you will make them.
- Choose smallest-first or the reverse challenge, which starts with the biggest deposit.
- Pick a start date to get the full schedule with running totals.
Formula
Total = n × first + increase × n × (n − 1) ÷ 2
n is the number of deposits. Each deposit equals first + (k − 1) × increase for deposit k. Reversing the order changes when you save, not the total.
Example
The classic challenge uses a $1 first deposit, a $1 increase and 52 weekly deposits: 52 × 1 + 1 × 52 × 51 ÷ 2 = $1,378. Starting January 1, 2027, the last $52 deposit falls on December 24, 2027. Halfway through, after week 26, you have saved only $351, because the larger deposits all come at the end. The 365-day penny challenge (1¢ rising by 1¢ daily) totals $667.95.
Frequently asked questions
What is the reverse 52-week challenge?
You start with the largest deposit ($52) and finish with $1. The total is the same $1,378, but the hard weeks come first, while motivation is high, and the end of the year (often an expensive time) is cheap.
How do I do the 100 envelope challenge here?
Use a $1 first deposit, a $1 increase and 100 deposits. The total is $5,050; you can still pick envelopes in random order, since the order does not change the total.
How can I save more with the same method?
Scale the numbers. A $5 start with a $5 increase over 52 weeks saves $6,890, and $10 steps save $13,780.
Where should I keep the money?
A separate high-yield savings account works well: the money is out of sight, earns interest, and you can move each deposit with an automatic transfer.
Last updated: 2026-10-30