The classic 52-week challenge saves $1,378 in a year by adding $1 each week. Doing it in reverse – starting with the largest deposit – front-loads the hardest weeks while motivation is high.
How to use the Savings Plan Calculator
- Deposit frequency
- Number of deposits
- First deposit
- Increase each time
Results update as you type, and every field accepts the units shown in its menu.
How it works
Choose the deposit frequency and number of deposits, then the first deposit and the increment.
Tips
- Use your real spending from bank statements rather than guesses.
- Automate savings so they happen before you spend.
- Revisit your plan once a year or after any big life change.
- Keep an emergency fund before investing for long-term goals.
Common mistakes to avoid
- Underestimating irregular expenses such as car repairs, gifts and annual bills.
- Ignoring inflation for long-term goals.
- Taking on high-interest debt to fund wants.
Inputs explained
| Field | What to enter |
|---|---|
| Deposit frequency | Choose one: Daily, Weekly, Bi-weekly, Monthly |
| Number of deposits | A number |
| First deposit | Amount in your currency |
| Increase each time | Amount in your currency |
What each result means
- Total saved = [Number of deposits]×[First deposit] + [Increase each time]×[Number of deposits]×([Number of deposits] – 1)÷2
- Last deposit = [First deposit] + ([Number of deposits] – 1)×[Increase each time]
- Average deposit = [Total saved]÷[Number of deposits]
- Length of the challenge = [Number of deposits]÷[Deposit frequency]×12
Example values
How the main result changes when Number of deposits changes and everything else stays at the example values above:
| Number of deposits | Total saved |
|---|---|
| 26 | 351 |
| 39 | 780 |
| 52 | 1,378 |
| 65 | 2,145 |
| 78 | 3,081 |
| 104 | 5,460 |
Formula
Deposit k = first deposit + (k − 1) × incrementTotal saved = n × first deposit + increment × n(n − 1) ÷ 2Last deposit = first + (n − 1) × incrementWorked example
Inputs — Deposit frequency: Weekly; Number of deposits: 52; First deposit: $1; Increase each time: $1.
Results — Total saved = $1,378.00; Last deposit = $52.00; Average deposit = $26.50; Length of the challenge = 12 months.
Frequently asked questions
How much does the 52-week challenge save?
$1,378 when you start at $1 and add $1 every week.
Can I do the challenge in reverse?
Yes – start with $52 and decrease by $1, which makes December easier.
What about a $5 increment?
Starting at $5 and adding $5 a week saves $6,890 in a year.
What formula does the Savings Plan Calculator use?
Deposit k = first deposit + (k − 1) × increment.