The basic formula without interest is simple:
Monthly savings = Goal amount ÷ Number of months
$10,000 in 2 years = $10,000 ÷ 24 = $417/month
With interest (e.g., in a high-yield savings account at 4.5% APY):
PMT = FV × (r / ((1 + r)^n − 1))
Where FV = goal, r = monthly rate (0.045/12 = 0.00375), n = months.
$10,000 in 24 months at 4.5% APY:
PMT = $10,000 × (0.00375 / ((1.00375)^24 − 1)) = $399/month
The interest saves you $18/month or $432 total. For larger goals and longer timelines, the savings from interest compound significantly more.
