Economy calculators

Money that sits still and money that compounds behave very differently over a couple of decades, and the gap is wider than most people expect. The calculators in this category work out how savings and investments grow over time — what the interest rate is worth, how often interest is added, and what regular contributions do to the final figure. Each one shows the formula it used, so the result can be checked rather than trusted. They also let you subtract the things that quietly eat returns: inflation, which erodes what the money will actually buy, and tax on the interest earned. Nothing here is financial advice, and every projection assumes a steady rate that the real world does not provide.