How the Required Contribution Is Solved
Future value math normally starts with a contribution and asks what it becomes. This calculator runs the equation in reverse: it starts with the target and solves for the payment. It compounds monthly, matching how most savings plans actually deposit.
In the default example, your existing $10,000 grows to about $20,000 at a 7% return over 10 years. Closing the remaining $80,000 gap takes roughly $462 a month. Raise the return or shorten the timeline and the payment climbs; lower the goal or add time and it falls.
Where to Put the Monthly Savings
The math above works for any account, but the account choice decides how much of the growth you keep. Fund the tax advantaged space first, because the compounding is the same and the taxes are smaller or deferred.
In 2026 the annual limits are $24,500 for a 401(k), $7,500 for an IRA, and $4,350 for an individual HSA or $8,700 for a family HSA. A target inside one of those accounts needs a smaller gross contribution than the same target in a taxable account, because the tax bill on the growth is lower.
Connecting Monthly Savings to a FIRE Number
If the target is retirement, back into it from your expenses. A common planning rule is that a portfolio can support about 4% of its value per year, which means you need roughly 25 times your annual spending. For $40,000 a year in expenses, that is a $1,000,000 target.
Run this calculator once with the retirement number and once with a nearer goal like a house down payment or a new car. Seeing the monthly price of each goal makes prioritization concrete, and it shows exactly what changes when you adjust the timeline.
Frequently Asked Questions
How is monthly savings calculator calculated?
The formula is: PMT = (Target - PV x (1+r)^n) x r / ((1+r)^n - 1). Enter your values above and click Calculate to see your personalized result instantly. This calculator solves the compound growth equation for the monthly contribution you need. With $10,000 already saved, a $100,000 target, 10 years, and a 7% annual return, you need to set aside…
What inputs do I need for the monthly savings calculator?
You need: Current Savings, Target Amount, Years, Annual Return. Default values are pre-filled — adjust them to match your personal finances for a customized result.
Is the monthly savings calculator free to use?
Yes — all TorchFI calculators are completely free. No registration, no email required. Calculations run entirely in your browser for maximum privacy. We never see or store your financial data.
How does the monthly savings calculator help with FIRE planning?
Find the monthly savings you need to reach a target amount. Solve the compound growth formula for the contribution required in the time you have. This calculator helps you make data-driven decisions about your financial independence journey instead of relying on guesswork.