UK Savings calculator

How savings growth is calculated

The balance compounds monthly at your APY (annual percentage yield) while your deposits are added each month. APY already includes the effect of compounding, which is why it's the number to compare between accounts — a 4% APY beats a "4% nominal, paid annually" rate.

The rate is almost everything

The most expensive financial mistake most households quietly make is savings sitting at a legacy rate. $20,000 plus $250/month for five years earns about $3,900 at 4% APY — and barely $460 at 0.5%. Identical deposits, identical protection, roughly $3,400 difference. High-yield accounts at FDIC/FSCS/CDIC/FCS-covered institutions carry the same government protection as the big household names.

Where savings accounts fit

• Emergency fund — 3–6 months of essential expenses belongs here, not invested. Size yours with the emergency fund calculator.
• Short-horizon goals — money needed within ~3 years shouldn't ride the stock market.
• Known future dates — if the date is fixed (a deposit next spring), a CD or term deposit can lock today's rate.

Mind the fine print

Savings rates are variable and follow central-bank rates down as well as up; promotional "bonus" rates often expire after a few months; and some accounts cap withdrawals. Recheck your rate at least once a year — switching takes minutes and compounds for years. Interest is generally taxable outside sheltered wrappers (ISA in the UK, TFSA in Canada), at your marginal rate.