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Interest & fixed income

Compound interest with contributions, simple interest and fixed-income comparisons.

Compound interest

How much your money grows with monthly contributions, against a benchmark rate and inflation, year by year.

Contributions, benchmark and inflation

Simple vs. compound interest

Final amount, interest in each period and the gap between simple and compound interest, in charts and a table.

Final amount, interest per period and the gap

Fixed, floating or inflation-linked

Compare fixed, floating and inflation-linked returns over the same term, with breakeven inflation, breakeven rate and the winner in each scenario.

Breakeven inflation and breakeven rate

Lump sum vs. DCA

Compare investing a lump sum with spreading it over monthly purchases, with average cost and rally and decline scenarios.

All at once or spread out

Investment fees

See how much management and account fees take from your savings over the years, with and without fees and against a cheaper option.

What fund fees take from your savings

Also useful

Rate converter

Convert rates between month, year and day (252, 360 or 365), APR to APY, and work out the true cost of a loan with fees.

Monthly ↔ annual, APR ↔ APY, true cost

College savings

Find how much to save each month for college, with tuition rising faster than inflation, earnings, tax and the cost of waiting.

Future cost and monthly savings

Other groups in Investing

Retirement & passive incomeTaxes & portfolioStock fair valueStock analysis