# Savings Plan Calculator (52-Week Challenge)

URL: https://speedycalculator.com/calculators/finance/savings-plan/
Last updated: 2026-10-25

> The savings plan calculator works out how much a savings challenge will build – like the 52-week money challenge, where you save $1 in week 1, $2 in week 2 and so on – with daily, weekly, bi-weekly or monthly deposits that stay fixed or grow by a set amount.

## Inputs

- Deposit frequency
- Number of deposits
- First deposit
- Increase each time

## Results

- Total saved
- Last deposit
- Average deposit
- Length of the challenge

## Formula

```
Deposit k = first deposit + (k − 1) × increment
Total saved = n × first deposit + increment × n(n − 1) ÷ 2
Last deposit = first + (n − 1) × increment
```

## Explanation

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

FieldWhat to enterDeposit frequencyChoose one: Daily, Weekly, Bi-weekly, MonthlyNumber of depositsA numberFirst depositAmount in your currencyIncrease each timeAmount 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 depositsTotal saved2635139780521,378652,145783,0811045,460

## Worked 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.

## FAQ

**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.