Savings Challenge Calculator
See how much the popular savings challenges add up to — and build your own.
Updated · How we check our maths
- Total saved
- $1,378
- Deposits
- 52
- First / last deposit
- $1 / $52
- Average per deposit
- $26.50
- With weekly interest at 4% APY
- $1,396.19
Quick answer
The 52-week challenge (save $1 in week 1, $2 in week 2 … $52 in week 52) adds up to $1,378. The 100 envelope challenge (envelopes numbered $1–$100) totals $5,050. Double every amount to save $2,756 or $10,100.
What the Savings Challenge Calculator does
Pick a challenge, scale it with a multiplier or build your own with a starting amount and a step. The calculator totals the deposits and — for weekly challenges — shows the balance if you keep the money in a high-yield savings account.
The reverse 52-week challenge saves the same $1,378 but front-loads the big deposits in January, when motivation is high and before holiday spending.
The formula
Total = n(n + 1)/2 × multiplier for the 52-week (n = 52 → 1,378) and 100-envelope (n = 100 → 5,050) challenges.
Worked example
Custom: start at $5 and add $5 every two weeks for a year (26 deposits) → $5 + $10 + … + $130 = $1,755.
How to use the Savings Challenge Calculator
- Choose a challenge.
- Optionally set a multiplier or a custom plan.
- Enter your savings APY to include interest.
Frequently asked questions
How much is the 52-week money challenge?
$1,378 in total at $1 per week increments.
How much does the 100 envelope challenge save?
$5,050 — the sum of 1 to 100.
How can I make the challenge easier?
Try the reverse version, halve the amounts, or automate transfers on payday.
Results are estimates for planning and learning. Check important figures with a qualified professional. How we build and check our calculators.