Divide the gap by the contribution

Subtract any amount already saved from the goal. Divide the remaining gap by what you can set aside each period. Round up to a whole contribution because a partial month or payday still requires a payment. The CFPB goal worksheet starts with an amount available to save after expenses and existing savings.

State what is excluded

This is a contribution-only forecast. It does not assume interest, investment returns, fees, inflation, or missed payments. If your contribution varies, calculate a range using a cautious and an optimistic amount rather than a single precise date.

Account for a head start and a remainder

If you already have £250 toward a £1,200 goal, the remaining gap is £950. At £150 each month, six full contributions cover £900 and a seventh contribution covers the last £50. The mathematical quotient is about 6.33 months of contributions, but the earliest complete monthly payment schedule reaches the target in month seven. This matters when a purchase date is tied to paydays rather than continuous saving.

Make the assumption visible

A contribution plan is only as reliable as the money left after bills. If contributions pause for one month, shift the projected completion by at least one month. If you expect interest, do not add an invented rate to make the target look sooner; quote the actual account terms and model those separately. This guide deliberately uses no return forecast. It helps answer “how much and how often?” using only amounts the reader supplies.

Try it with your numbers

Try “How many £150 monthly contributions make £1,200?” If you already saved some money, subtract it from the target first. When the quotient is not a whole number, round the number of payments upward to reach or exceed the goal. Leave out interest unless you have actual terms and a supported way to model them; this guide is contribution-only.

Try it yourself

A worked example

An eight-month target

“How many months to save £1,200 at £150 per month from zero?”

  1. £1,200 ÷ £150 = 8 contributions
8 monthsAssumes one contribution every month and no interest.

Sources and further reading