Work out allowance savings instantly with clear inputs, formula shown and shareable results.
Regular saving from an allowance compounds as an ordinary annuity: each contribution earns interest for the remaining months. At small balances and low rates the interest is modest, but the mechanism is exactly the one that drives long-term wealth building.
Future value of contributions
FV = C x ((1 + r)^n - 1) / r, r = annual rate / 12
Because both the balance and the period are small. The formula matters because the same arithmetic on a pension over 40 years produces most of the final value.
A third is a common target and leaves plenty to spend. The habit matters more than the percentage.