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Finance & Business · pattern A, Numeric fields

Saving with regular contributions.

Enter a starting balance, monthly contribution, rate and term to see the final balance, how much of it is contributions and how much is growth.

Inputs

The formula used

A = P(1 + i)ⁿ + PMT·((1 + i)ⁿ − 1) ÷ i

Contributions are treated as made at the end of each month, an ordinary annuity. Payments at the start of the month earn one extra period each and give slightly more.

Final balance

32,703.47

Total contributed
25,000.00
Growth earned
7,703.47
Growth as a share of the total
23.56 %
Balance with no contributions
1,647.01
Balance with no growth
25,000.00
Doubling the contribution
63,759.92

Contributions dominate early; growth dominates late.

Over ten years at 5%, most of the final balance is money you put in. Over thirty, most of it is growth — because compounding needs time far more than it needs a high rate. The practical implication is that starting earlier beats saving more later, and the panel's growth share makes the crossover visible.

Questions about savings

Does contribution timing matter?
Slightly. Paying at the start of each month rather than the end earns one extra period of interest per contribution, worth a fraction of a per cent over a long term.
Should I use a nominal or real rate?
Real, for anything over a few years. Subtracting inflation from the nominal rate gives a rough real rate and a much more honest projection.
Is a fixed rate realistic?
For a savings account, roughly. For investments, no — returns vary and sequence matters, which a fixed-rate model cannot show.

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