Loading…
Find the monthly deposit needed to reach a savings target by a target date.
Find the monthly deposit needed to reach a savings target by a target date.
Enter values above and click Calculate — results will appear here with the formula explained.
Reaching a savings goal comes down to three variables: how much you need, when you need it, and what your money earns meanwhile. Rearranging the future-value formulas solves directly for the missing piece — the required monthly deposit. The structure rewards clarity: a vague 'save more' goal fails where '$462/month for 36 months to reach $20,000' succeeds, because the second version is verifiable every payday.
Interest lightens the load because part of the goal is met by growth on money already saved. At higher rates or longer horizons, growth covers a bigger share; at zero percent, the answer collapses to simply dividing the shortfall by the number of months. A 5-year goal at 4% needs noticeably less per month than the same goal in a 0% checking account — which is why idle cash in non-interest accounts is a silent tax on every goal.
Where the money sits matters as much as the math. Emergency funds belong in liquid, insured accounts (high-yield savings, money market) even at modest rates, because the job is availability, not growth. Short-horizon goals (under ~3 years) similarly favor stability over returns — markets can easily be down when the tuition bill or house deposit comes due. Long-horizon goals can accept invested volatility for higher expected growth, matched to risk tolerance.
Automation beats willpower in every savings study worth citing: transfers scheduled for payday get saved, while 'whatever is left' gets spent. Name accounts by goal (house, travel, buffer), route fixed amounts on payday, and treat the transfer as a bill. Rounding the computed deposit up to a clean number builds a quiet buffer that absorbs months when life intrudes.
Inflation redefines the target while you save. A $20,000 goal three years out at 3% inflation needs about $21,850 in future dollars to buy what $20,000 buys today. For goals beyond ~5 years, either inflate the target first or use a real (after-inflation) return in the calculation — otherwise you will hit the number and miss the purchasing power.
When the required deposit exceeds reality, three levers exist and only three: more time, higher return (with higher risk), or a smaller goal. Extend the deadline first — time is the only lever that helps without cost or risk. Raise return assumptions last and skeptically, since optimistic rates manufacture affordable plans that reality later vetoes.
Find the monthly deposit needed to reach a savings target by a target date. Formula: C = (Goal − Current·(1+i)ᵐ) ÷ (((1+i)ᵐ − 1)/i), with i the monthly rate and m the months. Example: To turn $2,000 into $20,000 in 3 years with no interest you'd save $500/month.
Reaching a savings goal comes down to three variables: how much you need, when you need it, and what your money earns meanwhile. Rearranging the future-value formulas solves directly for the missing piece — the required monthly deposit. The structure rewards clarity: a vague 'save more' goal fails where '$462/month for 36 months to reach $20,000' succeeds, because the second version is verifiable every payday.
Interest lightens the load because part of the goal is met by growth on money already saved. At higher rates or longer horizons, growth covers a bigger share; at zero percent, the answer collapses to simply dividing the shortfall by the number of months. A 5-year goal at 4% needs noticeably less per month than the same goal in a 0% checking account — which is why idle cash in non-interest accounts is a silent tax on every goal.
Where the money sits matters as much as the math. Emergency funds belong in liquid, insured accounts (high-yield savings, money market) even at modest rates, because the job is availability, not growth. Short-horizon goals (under ~3 years) similarly favor stability over returns — markets can easily be down when the tuition bill or house deposit comes due. Long-horizon goals can accept invested volatility for higher expected growth, matched to risk tolerance.
Automation beats willpower in every savings study worth citing: transfers scheduled for payday get saved, while 'whatever is left' gets spent. Name accounts by goal (house, travel, buffer), route fixed amounts on payday, and treat the transfer as a bill. Rounding the computed deposit up to a clean number builds a quiet buffer that absorbs months when life intrudes.
Inflation redefines the target while you save. A $20,000 goal three years out at 3% inflation needs about $21,850 in future dollars to buy what $20,000 buys today. For goals beyond ~5 years, either inflate the target first or use a real (after-inflation) return in the calculation — otherwise you will hit the number and miss the purchasing power.
When the required deposit exceeds reality, three levers exist and only three: more time, higher return (with higher risk), or a smaller goal. Extend the deadline first — time is the only lever that helps without cost or risk. Raise return assumptions last and skeptically, since optimistic rates manufacture affordable plans that reality later vetoes.
To turn $2,000 into $20,000 in 3 years with no interest you'd save $500/month. At 4% APY, growth contributes about $1,376, cutting the requirement to roughly $462/month. A longer case: $5,000 toward $50,000 in 7 years at 5% needs roughly $440/month — while the same goal at 0% would demand about $536, showing how return and horizon share the load.
Formulas are standard public references (see our methodology). External standards are cited in the text where they apply.
Last reviewed: September 2026 · Report an error