Future Value Calculator

Introduction

This Future Value Calculator projects what today's savings and scheduled deposits will grow to at a fixed interest rate over a chosen term. Enter starting balance, periodic contribution, rate, compounding, and time to get FV and a growth schedule. It uses standard compound interest and annuity formulas used in finance textbooks and corporate planning models.

Who this calculator is for

Savers and investors who know what they put in and what rate they assume, and need the ending number for a plan: 529 projections, taxable brokerage targets, or employer match modeling. It is the forward-looking half of time value of money.

To find how much to save monthly for a fixed target, use the Savings Calculator or solve PMT on the Finance Calculator. To discount a future lump sum back to today, use the Present Value Calculator.

What it estimates

Future value combines FV of present value PV at rate i for n periods plus FV of an ordinary annuity of payment PMT: FV = PV(1+i)^n + PMT x [((1+i)^n - 1) / i]. Compounding frequency sets i = annual rate divided by periods per year. Step-up contributions where you increase savings each year require separate runs or manual adjustment; this page assumes flat payments unless noted.

Output includes total deposits, interest earned, and often a period table. Taxes, fees, and inflation are not subtracted unless you adjust the rate downward yourself. Variable market returns are not simulated. Employer match can be modeled as part of monthly payment if vesting is immediate.

Inputs explained

Keep payment interval and compounding consistent: monthly deposits with monthly compounding is standard.

• Present value (starting amount): Balance invested at time zero.
• Periodic payment: Fixed contribution each period; zero for lump-sum-only FV.
• Annual interest rate: Nominal annual rate before tax.
• Compounding / payment frequency: Monthly is typical for savings and brokerage auto-invest.
• Number of periods: Years times periods per year, or enter years if the tool converts.

How to read the results

Future value is the account balance at the end date if all assumptions hold. Interest equals FV minus PV minus sum of payments. On the schedule, later rows should show interest growing faster in dollar terms as the balance base enlarges.

Compare FV at 4.5% versus 6% on the same inputs to see rate sensitivity over 10 years. For CD maturity with bank APY, the CD Calculator may align better with disclosures.

Worked example

Starting amount $5,000, monthly payment $150, 4.5% annual rate compounded monthly, 10 years (120 months). Future value is approximately $29,500 to $30,500: about $23,000 of contributions ($5,000 + $150 x 120) and roughly $6,500 to $7,500 of interest.

Remove monthly payments and FV of $5,000 alone at 4.5% for 10 years is near $7,800. The deposit stream adds most of the ending wealth; interest still matters but contributions dominate on a 10-year horizon at moderate rates. Increasing the monthly deposit by $25 changes the ending balance by thousands over a decade.

Practical use cases

Project IRA balance at retirement assuming current balance and max annual contributions divided into monthly pieces. Show children how small monthly investing accumulates over a decade.

Evaluate whether to lump-sum invest a bonus now using FV of lump sum versus spreading via monthly FV sums on the Interest Calculator. For inflation-adjusted planning, add the Investment Calculator. Document the rate assumption in your plan so you can compare actual statements against the forecast each year.

Limitations and related tools

Missed contributions, step-up contributions, and rate changes mid-plan are not modeled. Beginning-of-period deposits would yield slightly higher FV than end-of-period.

Solve implied rate from actual start and end: Interest Rate Calculator. Compound growth narrative: compound interest explained. Bond maturity uses different math: Bond Calculator. When comparing FV to a CD quote, remember CDs do not accept monthly additions on most products.

How It Works

1. Enter starting balance. Type present value already invested.
2. Add payments and rate. Enter periodic deposit, annual rate, and compounding frequency.
3. Set the horizon. Choose years or number of periods until evaluation date.
4. Calculate future value. Click Calculate. Review FV, interest total, and the growth schedule.

Formula and methodology

The Future Value Calculator uses this identity for the scenario you enter. A bank, payroll system, or tax program may round on a 360-day year or average daily balance, so a statement can differ by a small amount.