How Much Will £10,000 Grow?

With interest added monthly and nothing else paid in, about £13,494 at 3%, £16,470 at 5% and £20,097 at 7%. That's before tax, fees and inflation.

At 5%, about £27,126 after 20 years and £44,677 after 30. At 7%, about £40,387 and £81,165.

About 14 years at 5%, 10 years at 7% and 7 years at 10%. A quick estimate is the Rule of 72: divide 72 by the interest rate.

A big one. £10,000 left for 20 years at 7% grows to about £40,387. Adding £100 a month takes it to about £92,480.

Usually a savings account, a cash ISA or a stocks and shares ISA. Cash is safer but tends to grow more slowly. Investments can fall, but have historically grown faster over 10 years or more. An ISA keeps the growth tax-free.