Savings Goal Calculator

WHAT IT DOES

Savings Goal Calculator shows you exactly how long it will take to reach your financial target. Enter your goal amount, current savings, monthly contribution, and expected annual interest rate. The panel instantly calculates the time to reach your goal, your total contributions, the interest earned along the way, and the final balance. A year-by-year progress breakdown shows your balance and completion percentage at each year, helping you visualize your journey toward your savings goal. Whether you are saving for a down payment, a vacation, an emergency fund, or retirement, this tool gives you clarity on the timeline and what it takes to get there.

WHERE IT RUNS

This script runs on every website you visit. Whether you are planning a major purchase on retail sites, evaluating savings plans on bank websites, working with financial projections in a spreadsheet application, or comparing investment strategies on a brokerage platform, the panel is always available. It works alongside your existing tools without interfering with your workflow.

HOW TO USE

Enter your target amount in the first field, your current savings in the second, your monthly contribution in the third, and the annual interest rate as a percentage in the fourth. Results update automatically as you type. The time to goal is displayed in years and months. The progress breakdown shows your balance and completion percentage for each year of the savings journey. Click any history entry to reload previous calculations for quick comparisons. Use the "Copy Result" button to copy the time to goal and final balance to your clipboard.

THE ITERATIVE COMPOUNDING MECHANISM

Savings Goal Calculator uses an iterative monthly compounding model that simulates real-world savings behavior. At each month, the calculator applies the monthly interest rate to the current balance, adds the monthly contribution, and checks whether the goal has been reached. This approach correctly handles the timing of contributions and interest — contributions are made at the end of each month before interest is applied in the following month, matching how most savings accounts and investment accounts actually work. The iteration continues up to 50 years (600 months) to find the exact month when the goal is reached. The year-by-year breakdown shows cumulative progress, giving you a clear picture of how compounding accelerates over time. This method provides more accurate results than simpler formulas that assume contributions are made at the beginning of the period or that interest is applied annually.

THE PANEL

The panel is fully draggable and remembers its position per site. It minimizes to a compact floating bubble when collapsed. All settings — default interest rate, default monthly contribution, and calculation history — persist across browser sessions using GM_setValue storage. Press the Escape key to close the panel. The panel automatically focuses the target amount input field for quick keyboard entry.

PLEASE NOTE

This script requires the free BotGentz extension to run. The calculations are estimates based on your inputs — actual savings growth depends on market conditions, fees, and the specific terms of your savings or investment accounts. Interest rates are not guaranteed and can fluctuate over time. Always consult with a qualified financial advisor before making savings or investment decisions. Websites change their structure and behavior over time; if any functionality stops working, the script may need an update. No user data is sent anywhere — all calculation history and settings are stored locally in your browser. The script never reads or modifies password, hidden, or file input fields.