Savings Goal Calculator
Calculate how much you need to save each month to reach your financial goal. Reverse-engineers contributions with compound interest, starting balance.
Your Savings Target
Required Monthly Contribution
⚖️ Decision Verdict: £3,365 in Free Compound Yield
By investing £672/mo at 4.5% APY rather than storing cash under a mattress, compound interest finances £3,365 (8.4%) of your £40,000 target.
Savings Plan Summary Telemetry
About this tool
How to use it
- Enter your target financial goal amount and any existing initial savings you have already accumulated.
- Specify your target timeline in years and additional months.
- Input your expected annual interest rate (APY) from a high-yield savings account, cash ISA, or treasury bond.
- Click 'Calculate Monthly Deposit' to see the exact monthly contribution required.
- Review the breakdown of your own personal contributions vs free compound interest earned.
Why it matters
Vague financial goals like 'I want to save more money' rarely succeed without a concrete, reverse-engineered monthly action plan. By modeling the future value of your initial deposit alongside an ordinary annuity of monthly contributions, this calculator solves for the exact monthly figure required to reach your target by a specific calendar date, showing how compound interest reduces the amount of cash you need to set aside out-of-pocket.
When to use it
Use this calculator when planning a home deposit, accumulating an emergency fund cushion, budgeting for a wedding, saving for a new vehicle, or funding an education milestone.
Good to know
Annuity Formula: Monthly deposits are calculated using the sinking fund annuity formula: PMT = FV * (r / ((1 + r)^n - 1)), ensuring mathematical precision down to the penny.
Common questions
How does compound interest help my savings goal?
When you save money in a high-yield account, you earn interest on both your principal deposits and on the interest previously credited. Over multi-year horizons, compound interest can fund 10% to 25% or more of your total goal.
What interest rate should I use?
For short-to-medium term goals (under 5 years), use the rate of a risk-free High-Yield Savings Account (HYSA), Cash ISA, or Treasury bill (typically 4% to 5% in current market environments). For horizons over 5 to 10 years, diversified index funds historically return 6% to 8% before inflation.
What if I already have some savings?
Enter your existing savings into the 'Starting Balance' field. The calculator compounds this lump sum over your entire timeframe first, subtracting its future value from your target before calculating monthly payments.
Can I save weekly or bi-weekly instead?
Yes! The telemetry section displays your exact equivalent weekly target (Monthly / 4.33) and daily target (Monthly / 30.4) to match your payroll schedule.
Are savings returns guaranteed?
Cash savings accounts protected by government deposit insurance (FSCS up to £85k in the UK, FDIC up to $250k in the US) provide guaranteed capital protection. Equity market investments carry market volatility and do not guarantee fixed returns.