52-week savings challenge 2027: dates, totals and easier versions

Last updated: 4 November 2026 · By Quicksloth

The 52-week savings challenge is one rule: in week 1 you set aside $1, in week 2 $2, and so on up to $52 in the last week. Here is the whole of 2027 week by week with real dates and a running total, what each month asks for, and the versions that are easier to finish: backwards, every 2 weeks, half, or a fixed amount. Then the 100 envelope challenge, worked out the same way.

Short version: the 52 weeks add up to $1,378 (1 + 2 + … + 52). In 2027 the challenge fits neatly on Fridays: 1 January 2027 is a Friday, so week 1 is Friday 1 January and week 52 is Friday 24 December. The catch is the end of the year: the classic version asks $15 in January and $202 in December. The reverse version (start at $52, end at $1) saves the same $1,378 and asks only $10 in December. Paid every 2 weeks? Put two weeks in at a time: 26 deposits from $3 to $103. The 100 envelope challenge adds up to $5,050, and its 50-envelope version to $1,275.

This is a worked example of a calculation, not financial advice. Pick the version that fits your own budget.

How the challenge works

• Each week, set aside the week's number in dollars. Week 1: $1. Week 10: $10. Week 52: $52.
• The total is $1,378. Adding 1 to 52 is quicker with a trick: pair the first and the last week (1 + 52 = 53), the second and the second-to-last (2 + 51 = 53), and so on. That's 26 pairs of $53, or 52 × 53 ÷ 2 = $1,378.
• Pick one day of the week and keep it. This page uses Fridays, because 1 January 2027 is a Friday and many people are paid on Fridays. Any day works; only the dates change.
• 2027 has 53 Fridays. Week 52 lands on 24 December, so Friday 31 December is free: a spare week to catch up on one you missed.
• Move the money out of your everyday account (to a savings account, for example) on the day, so it doesn't get spent by the end of the week.

The 2027 chart, week by week

The classic version on the left, the reverse version on the right. Both end at $1,378, on Friday 24 December 2027.

Halfway through the year, after week 26 on 25 June, the classic version has $351, about a quarter of the total; the reverse version has $1,027, about three quarters. Same money, in the opposite order.

What each month asks for

Here are the 52 weeks added up by month. A month with five Fridays has one more deposit than its neighbors.

• The classic version is back-loaded. January to April ask $171 in all; September to December ask $748, more than half of the total, in the months of back-to-school, holidays and gifts.
• The reverse version is front-loaded. $783 goes in from January to April, and only $153 from September to December. It's harder in the first weeks, when the new-year motivation is there to help, and easy at the end.
• Neither changes the total. If December is the month your budget is tightest, the reverse version is the one more likely to get finished.

Every 2 weeks: 26 deposits

If you're paid every 2 weeks, it's easier to save on payday than every Friday. Put two weeks of the challenge in at a time: weeks 1 and 2 together ($1 + $2 = $3), then weeks 3 and 4 ($7), and so on. Each deposit is $4 more than the last, and the total is still $1,378. With paydays every other Friday from 1 January 2027:

• Paid on the other Fridays? If your first payday of 2027 is Friday 8 January, move every date one week later: the 26th deposit falls on 24 December.
• A third payday: paid every 2 weeks from 1 January, 2027 has 27 paydays, and the 27th, on 31 December, has no deposit. January, July and December each have three paydays that year; how that changes a budget is in How to budget by paycheck.
• Every 2 weeks in reverse: read the Save column from the bottom up, $103 on 1 January down to $3 on 17 December.

Half, double or a fixed amount

The step between weeks doesn't have to be $1. The same plan at other sizes:

The fixed version gives up the game of the growing number, but it's the easiest to plan: $26.50 a week reaches the same $1,378 with the same amount every week. With the half version, every number in the chart above is simply divided by two.

The 100 envelope challenge

Number 100 envelopes from 1 to 100 and mix them up. Each time, draw one and put that many dollars in it (or set the amount aside). When all 100 are filled, you have $5,050: the same pairing trick, 100 × 101 ÷ 2. Because you draw at random, the big and small amounts are spread across the challenge instead of piling up at the end.

• There's no fixed timeline. One envelope a day finishes the 100 in a little over three months, but at about $50 a day on average, about $350 a week. Two a week takes about a year, at about $101 a week on average.
• The 50-envelope version, one a week, is close to the 52-week challenge: $1,275 in 50 weeks, about $25.50 a week on average, without the December pile-up.
• A random draw can be unkind: two big envelopes in the same week happen. If a draw doesn't fit the week, put it back and draw again; the total doesn't change as long as every envelope gets filled once.

Keeping track in a spreadsheet

A printed chart where you cross off each week works. A spreadsheet adds the running total for you and shows when you've fallen behind. You need two things: a list of the deposits (date, amount) and a goal (the total, $1,378, and the end date, 24 December 2027). Saved so far is the sum of the deposits; on any date it should match the "total so far" of that date in the chart above.

Our Budget Planner has no 52-week challenge built in, but its Savings Goals tab can hold one as a goal:

• On a free row of Savings Goals: Name "52-week challenge", Goal 1,378, Due date 24 December 2027, Starting amount 0.
• Each Friday, one row in Transactions: the date, "Week 1" as the description, the goal's name "52-week challenge" picked from the Category list (the Type column shows Goal), and the week's amount.
• The tab adds up the rows in Saved and shows Still needed, Months left, Per month, Per paycheck, a progress bar and a status (Saving, then Funded).

Seen on 1 April 2027, after the 13 Fridays of January to March ($91 in all), the row reads:

How to read Per month here. The planner doesn't know the challenge's schedule: Per month is what's still needed spread evenly over the months left ($1,287 ÷ 8 = $160.88), the amount that would finish the goal on time at a steady pace. Per paycheck is the same amount per paycheck, here with pay every 2 weeks from 1 January (27 paychecks: $160.88 × 12 ÷ 27 = $71.50). The classic challenge asks less than that in spring ($80 in April) and more at the end of the year, so:

• Per month climbs through most of the year with the classic version and falls with the reverse one. Neither means you're off track. The check is Saved against the chart: $91 on 1 April is exactly where the classic version should be.
• The goal's Per month is part of the Saved budget on the Monthly tab, so in spring the Saved line there reads "left to save" (or "below plan" once the month is over) even when you follow the challenge to the dollar. If you'd rather the monthly budget matched, the fixed version ($26.50 a week) is the closest to an even pace.
• Months left, Per month, Per paycheck and, after 24 December, the Status (Past due) depend on today's date: the values above are for 1 April 2027. Open the file on another day and they change; Saved, Still needed and Progress don't.

What this page assumes

• Deposits on Fridays, starting Friday 1 January 2027. With another day, the amounts and totals stay the same and only the dates move.
• Amounts in dollars; the plan works the same in any currency. Interest, if your savings earn any, is left out.
• The savings goal row uses the formulas of our planner's Savings Goals tab: Still needed = Goal − Saved, Months left = calendar months from this month to the month of the due date, Per month = Still needed ÷ Months left rounded to the cent, Per paycheck = Per month × 12 ÷ the paychecks in the year.

We worked the numbers out with a script and checked every total against the formula (52 × 53 ÷ 2, 100 × 101 ÷ 2). The savings goal row was checked in LibreOffice on a copy of our example file with the challenge's first 13 weeks typed in. We used AI tools to help write this article and the calculations.

Start your own

Our Budget Planner keeps a challenge like this as one row of its Savings Goals tab, next to up to nine other goals, 20 sinking funds and your whole monthly budget, all from one list of transactions. It works in Excel and Google Sheets and is coming soon to our Etsy shop.

Saving for bills that don't come every month? See Sinking funds: a worked example for irregular bills. Deciding where your monthly money goes? See Budget categories: a complete list to copy, with examples.

Not financial advice. The tables show how the challenge adds up; they don't know your income or whether saving this way fits your budget.