Your circle already works. Now you can see the math.
You and ten people you trust put in the same amount every payday. Each round, one person takes the pot. Your grandmother ran one. Your aunties run one. People have been doing this for generations under a dozen names, njangi in Cameroon, susu in Ghana, esusu in Nigeria, tandas in Mexico, ajo, chama, hui, partner hand. It works because the people in it keep their word. What it has never come with is a clear picture of the numbers before you say yes. That is the one thing this calculator gives you. Punch in the details, and in a few seconds you see exactly what you are signing up for: how much lands in your hands when your turn comes, the date that turn arrives, and what every other round looks like too. No spreadsheet, no guessing, no waiting until month four to realize the timing does not fit your life.
What the calculator actually does
You enter five things: how many members are in the circle, how much each person contributes, how often you pay in (weekly, every two weeks, monthly), which position is your turn, and your currency. The calculator does the rest and shows you four numbers that matter. Your payout: the lump sum you receive when the rotation reaches you. Your turn date: the actual calendar day that money is due to you, counted from the start. Your total contributed: every dollar you will pay in across the full cycle, so you can confirm you get back what you put in. And the full rotation schedule: a round-by-round table showing who gets paid when, all the way to the last turn. You see the whole circle at once, not just your own slice.
Why seeing the numbers first protects you
A rotating circle is a trade in timing, and timing is worth money. If you draw an early turn, you get the full pot before you have finished paying it in. That is an interest-free advance, useful if you have a deposit due, a flight to book, or a bill that will not wait. If you draw a late turn, you are the one lending. You pay in for months and collect at the end, which is a disciplined, interest-free way to save when you would otherwise spend it. Neither position is bad. The mistake is committing to a turn that fights your real life, taking a late slot when rent is the reason you joined, or an early one when you have nothing pressing and would rather build savings. When you can see your turn date and your payout against the calendar, you choose the position that fits instead of finding out the hard way. You also catch the obvious traps before money moves: a contribution that is higher than your monthly room, a cycle that runs longer than you expected, a member count that stretches your payout into next year.
Free, no login, no funds moved
The calculator lives at wiremi.ca/tools/rosca-calculator/ and it is genuinely free. No account, no email, no sign-up wall. It does not touch your bank, it does not move a single dollar, and it does not ask for anything sensitive. It is a planning tool, the kind you would want on the table the night your circle decides who goes when. Run it as many times as you like. Change the contribution, swap your turn position, switch the currency, compare a ten-person circle against a six-person one. It is meant to be played with until the plan feels right for everyone at the table.
From planning the circle to running it
Once the numbers look right, the harder part has always been keeping the circle honest over the months it runs. Who paid this round? Whose turn is next? Did everyone agree to the change? Memory and group chats lose track fast, and that is where good circles go sour. The Wiremi app lets you host your circle and keep an on-ledger record: every contribution and every turn written down in one place everyone can see, so there is no he-said she-said by round eight. It is the same circle you already run, with a clean record instead of a notebook. The calculator is the plan. The app is how you keep the plan straight once real people and real money are involved. You can start with the calculator today and bring the app in whenever your group is ready.
