How Long to Save Calculator

Saving for a goal is easier when you know exactly how long it will take. This calculator shows you the timeline and helps you adjust your monthly amount to hit your target faster.

The basic formula: Months = (Goal - Current Savings) / Monthly Savings

With interest (savings account or investments): For compound interest, the formula is more complex because your existing savings earn returns: Months = log((Goal × r/12 + Monthly) / (Current × r/12 + Monthly)) / log(1 + r/12)

Where r = annual interest rate.

Common savings goals and typical timelines:

• Emergency fund (3–6 months expenses): 6–18 months at 10–20% of income
• Vacation ($2,000–5,000): 3–12 months
• Down payment ($20,000–60,000): 2–5 years
• Car purchase ($15,000–35,000): 1–3 years
• Wedding ($20,000–40,000): 1–3 years

Where to keep it, roughly in order of how soon you need it:

• High-yield savings account - best for anything under two years. Rates move with the central bank, so check the current one rather than a number written on a web page.
• Certificate of Deposit (CD) ladder - good when the date is fixed and you will not need the money early.
• Index funds - for goals five or more years out. The long-run average is far better than cash and the ride is far worse, so nothing you need in three years belongs here.
• A regular checking or basic savings account - the worst of the four. It usually pays a fraction of a percent, which is a real loss once inflation is counted.

The 50/30/20 rule: Allocate 50% of income to needs, 30% to wants, and 20% to savings. If you earn $4,000/month after tax, that means $800/month for savings goals.

The one thing that beats any of this: automate the transfer for payday, so the money leaves before you see it. Willpower is a renewable resource but not a reliable one, and a standing order does not have bad weeks. It also removes the decision entirely, which is the actual point. Nobody has ever forgotten to save on a month the transfer fired by itself.