How to Use the 26-Week Savings Challenge Calculator
The 26-week savings challenge builds a saving habit by having you increase your deposit a little each week for 26 weeks (about six months). You start with a small, manageable amount — say $1 — and add the same increase every week, so by week 26 you're depositing a noticeably larger amount, which gives a real sense of accomplishment. This calculator gives each week's deposit simple interest proportional to how long it remains in the account until week 26, then adds up all 26 weeks for your total interest before tax.
For example, starting at $1 in week 1 and increasing by $1 each week means your week-26 deposit is $26, and your total principal across all 26 weeks is $351. At a 4% annual rate, that earns roughly $2.52 in pre-tax interest, bringing your total at completion to about $353.52.
The dollar amounts here are small, so the interest itself is modest — the real value of the challenge is building a consistent savings habit. Once you finish, many people restart with a bigger weekly increase, or pair it with a longer-term savings ladder for a bigger financial goal.
Frequently Asked Questions
Each week's deposit earns simple interest proportional to how many weeks remain until week 26. We add up the interest from all 26 weeks to get the total interest before tax.
Most banks let you catch up by making the missed deposit later, but since it sits in the account for fewer weeks, that deposit earns slightly less interest than if it had been made on time.