Savings Goal Calculator

About Savings Goal Calculator

How Does the Calculator Work?

The tool runs a month-by-month simulation using the future-value-of-annuity formula. Each month, interest accrues on the running balance, then the monthly deposit is added. The simulation stops when the balance crosses the goal amount (How long? mode) or at the deadline (How much per month? mode).

How long? mode: Goal £15,000, current savings £2,000, monthly deposit £400, interest 4.5% AER. Without interest: (£15,000 - £2,000) / £400 = 32.5 months. With 4.5% interest compounding monthly (monthly rate 0.375%), the balance reaches £15,000 in about 30 months (2 years 6 months), saving roughly 2-3 months thanks to accrued interest.

How much per month? mode: Goal £15,000 in 24 months, current savings £2,000, interest 4.5% AER. You need about £525/month (without interest, £541/month).

The Formulas

Time to reach a goal with regular deposits and compounding:

Months = ln[(Goal x r + PMT) / (Current x r + PMT)] / ln(1 + r)

where r is the monthly interest rate (annual rate / 12) and PMT is the monthly deposit. The tool iterates month by month so deposits made at the end of each period receive no interest that same month, matching standard bank practice.

Required monthly deposit for a fixed deadline:

PMT = (Goal - Current x (1+r)^n) x r / ((1+r)^n - 1)

where n is the number of months until the deadline. This is the future-value-of-annuity formula rearranged to solve for the payment. It assumes deposits at the end of each month (ordinary annuity).

What Rate Should I Use Right Now?

In April 2026, UK easy-access savings accounts pay up to 4.75% AER and the top rate available is around 4.85-5.00%, per Moneyfacts Compare. The Bank of England held Bank Rate at 3.75% at its 30 April 2026 MPC meeting on an 8-1 vote, and the rate has now been on hold since December 2025. As of 12 June 2026 the top easy-access rate has nudged up to 5.01% AER (Chip), per Moneyfacts Compare's weekly roundup. In the US, the national average savings rate is 0.59% APY according to Bankrate's April 2026 survey, but the best high-yield accounts pay 4.00-5.00% APY. Enter the rate on the actual account you plan to use, not the headline best-buy rate, unless you are willing to switch.

Account type	UK April 2026	US April 2026
High street easy-access	2.0-3.5% AER	0.01-0.50% APY
Challenger / online easy-access	4.5-5.0% AER	4.00-5.00% APY
Notice account (30-95 day)	4.6-5.0% AER	4.0-4.5% APY
Fixed-rate bond (1-year)	4.3-4.67% AER	4.1-4.5% APY
Cash ISA (easy-access, UK)	4.4-4.62% AER	-
Regular saver (UK)	5.0-7.0% AER (capped monthly)	-

Common Savings Goals and Typical Timelines

Goal	Typical target	At £300/month + 4% interest
Emergency fund (3 months)	£4,500-6,000	About 16-19 months
Emergency fund (6 months)	£9,000-12,000	About 28-37 months
Holiday fund	£2,000-5,000	About 7-16 months
Wedding	£15,000-30,000	About 4-7 years
House deposit (5%)	£12,500 (on £250K home)	About 3 years
House deposit (10%)	£25,000 (on £250K home)	About 6 years
New car	£10,000-20,000	About 2.5-5 years
University fund (3 years)	£30,000-50,000	10+ years from birth

How Much Are People Actually Saving?

UK households saved 9.9% of gross disposable income in Q4 2025, up from 9.1% in Q3 2025, according to ONS Quarterly Sector Accounts. The US personal saving rate fell to 2.6% of disposable income in April 2026, the lowest reading since June 2022, per the BEA's 28 May 2026 release (personal saving of $611.7 billion, with 3.8% headline inflation outpacing 3.6% wage growth). The long-run pre-pandemic average sits around 7-8% in both countries. UK households are still adding net deposits to banks and building societies despite the falling US rate: BoE Money & Credit data shows households deposited an additional £5.5 billion in March 2026, after £5.8 billion in February and £4.5 billion in January. If your own savings rate is below these figures, the calculator will show that ambitious short goals need either a higher contribution or a longer timeline - there is no trick to escape the arithmetic.

Inflation matters too. UK CPI was 3.0% in the 12 months to February 2026 (ONS), with the Bank of England expecting roughly 3.0-3.5% through Q2/Q3 2026. A savings account paying 4.5% AER is beating inflation by about 1.5 percentage points, which is a genuinely positive real return - worth noting when comparing against the zero real return most easy-access accounts delivered through 2021-2023.

Where to Keep the Money

Account type	Best for	Trade-off
Easy-access savings	Emergency fund, goals under 1 year	Rate can drop any time, but full flexibility
Notice account (30-95 day)	Goals 6-18 months away	Slightly better rates, withdrawal delay
Fixed-rate bond	Goals with a firm deadline 1-5 years out	Best rates but money is locked
Cash ISA (UK)	Any goal if you pay tax on savings interest	£20,000 annual limit, interest tax-free
Lifetime ISA (UK)	First home under £450K or retirement	25% government bonus, £4,000/year limit, 25% penalty on non-qualifying withdrawals
Regular saver (UK)	Goals under 12 months	High headline rate but low monthly cap (£200-300)
Money market account (US)	Larger balances with check access	Often requires $2,500+ balance
High-yield savings (US)	Emergency fund, flexible goals	Usually online-only, FDIC insured to $250K
Premium Bonds (UK)	Lump sums up to £50K	No guaranteed interest, prize rate ~3.8% equivalent

For goals more than 5 years away, a stocks-and-shares ISA or US brokerage account historically outperforms cash, but with the risk of short-term losses. The investment return calculator models this, and the compound interest calculator shows the effect of compounding over long horizons.

Tips for Reaching the Goal Faster

• Automate transfers. Set up a standing order for the day after payday so the money moves before you can spend it. Behavioural finance research (Thaler and Benartzi's "Save More Tomorrow" programme, published in the Journal of Political Economy) shows automatic saving consistently beats manual transfers because it removes the monthly decision.
• Use the best rate available. The difference between a 1% high-street account and a 5% challenger bank on a £10,000 balance over 2 years is roughly £800 in interest. Switching takes 15 minutes online.
• Round up the monthly figure. If the calculator says £283/month, round to £300. The extra £17/month adds £408/year with minimal lifestyle impact.
• Redirect windfalls. HMRC tax refunds, P60 overpayments, bonuses, tax rebates, and side income usually get absorbed into general spending. Diverting them straight to the savings account can shave months off the timeline without any change to the budget.
• Track the milestones. The 25%/50%/75% markers are there because research (Amir and Ariely, 2008) shows visible sub-goals increase follow-through on long-term targets. A mental "halfway there" is more motivating than one distant finish line.
• Review after Bank of England rate moves. Easy-access rates move with base rate, but providers often lag cuts by weeks and pass on rises only when pushed. If a cut just landed, check whether a better headline rate has appeared.

Common Mistakes

• Counting gross contributions but net interest. UK basic-rate taxpayers have a £1,000 Personal Savings Allowance (£500 for higher-rate, zero for additional-rate). Interest above that is taxed. For large goals in a taxable account, enter the post-tax rate.
• Assuming the rate holds. Easy-access rates are variable. A 4.75% rate today may be 3.5% in 18 months if base rate falls. For long goals, model a conservative rate rather than the top of the market.
• Ignoring inflation. A £20,000 house deposit in 10 years is worth less in today's money if prices rise 3% a year. The inflation-adjusted goal is roughly £26,900 - see the inflation calculator to size the gap.
• Locking money you might need. Fixed bonds pay more but charge early-exit fees or refuse withdrawals entirely. Emergency funds should stay easy-access even at a lower rate.
• Missing the LISA bonus deadline. The 25% Lifetime ISA bonus is paid on contributions up to £4,000 per tax year. Opening on 4 April gives you 2 days to use the allowance before it resets.
• Saving with credit-card debt outstanding. Paying 24.9% APR on a card while earning 4.5% on savings loses roughly 20p in the pound. Clear expensive debt first, then save.

How Does Interest Change the Answer?

For short goals (under 2 years), interest adds only a few pounds - it is the monthly discipline that matters. For longer goals, compounding grows meaningfully. A £30,000 target at £400/month takes 75 months with zero interest, 69 months at 4% AER, and 66 months at 5.5% AER. That is 9 months and roughly £3,600 saved on the deposit side.

The effect is larger with a bigger starting balance. Starting with £10,000 towards a £50,000 goal at £500/month: 80 months at 0% interest vs 69 months at 4.5% AER - an 11-month swing. The longer the money sits and the bigger the balance, the more compounding matters. This is why pension and long-term investment goals rely on compound growth rather than contribution discipline alone.

For debt-focused planning, see the debt payoff calculator. For mortgage-deposit sizing, the mortgage affordability calculator pairs naturally with this tool.

All calculations run entirely in your browser. No financial data is sent anywhere.

Sources

• Moneyfacts Compare - UK Easy Access Savings Rates (April 2026)
• Bankrate - US Average Savings Account Interest Rates (April 2026)
• ONS - UK Household Saving Ratio Time Series
• US Bureau of Economic Analysis - Personal Saving Rate
• BEA - Personal Income and Outlays, April 2026 (released 28 May 2026)
• ONS - UK Consumer Price Inflation
• Bank of England - April 2026 Monetary Policy Summary (Bank Rate held at 3.75%)
• Bank of England - Money and Credit, March 2026 (household deposit flows)
• GOV.UK - Personal Savings Allowance