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How Savings Growth Is Calculated

A savings calculator projects what your money will be worth after a set period, accounting for your starting balance, regular deposits, and the interest rate. It uses the same compound interest math as investment calculators, but typically with lower, more predictable rates since savings accounts don't fluctuate like stocks.

The Formula

FV = P(1+r)^n + PMT * [(1+r)^n - 1] / r

FV = Future value of your savings

P = Starting balance

PMT = Monthly deposit

r = Monthly interest rate (APY / 12 / 100)

n = Number of months

When to Use This

Setting a savings goal and figuring out how long it takes to reach it. Comparing high-yield savings accounts (4-5% APY in 2025-2026) against keeping cash in a checking account (0.01-0.1% APY). Planning an emergency fund, a vacation fund, or a house down payment.

Savings Accounts vs. Investments

Savings accounts are FDIC-insured up to $250,000. Your money won't lose value. But savings rates rarely beat inflation over the long term. A 4.5% savings rate with 3% inflation gives you only 1.5% real growth. For goals more than 5 years out, investing typically produces better returns despite the added risk.

What Affects Your Savings Most

Consistency of deposits matters more than the rate for most people. Depositing $500/month at 4% beats depositing $200/month at 5% by a wide margin. The rate helps, but the habit of putting money away is what builds the balance.

Common Mistakes

Confusing APY with APR. APY (Annual Percentage Yield) already accounts for compounding. APR doesn't. Most savings accounts advertise APY, which is the number you should use.

Assuming today's rate will last. High-yield savings rates change with the federal funds rate. A 5% APY in 2025 might be 3% by 2027. Use a conservative rate for long-term projections.

Not accounting for taxes. Interest on savings accounts is taxable as ordinary income. If you're in the 22% tax bracket, your 4.5% APY effectively becomes 3.51% after taxes.