Tools in Finance

Personal finance tools: simple and compound interest, loan amortization, discounts, tips, retirement savings and inflation.

TopAmortization CalculatorWork out your fixed monthly payment, total cost and lifetime interest for any mortgage, auto or personal loan with the standard amortization formula.
TopCompound interest calculatorSee how your savings grow with compound interest and monthly contributions. Includes the exact formula, worked examples and instant results.
TopDiscount calculatorFind the sale price after a discount, stack a second coupon on top, and see your total savings plus the real effective discount percentage.
Inflation calculatorSee what today's $10,000 will cost in the future and how much buying power you lose at 2%, 3% or any annual inflation rate over 1 to 50 years.
Retirement savings calculatorEstimate your nest egg at retirement from your current savings, monthly contributions and expected return. Includes the formula and worked examples.
TopSimple interest calculatorFind simple interest on a loan, CD or T-bill with I = P × r × t: interest earned, final amount and average monthly interest. Free, instant, with examples.
TopTip CalculatorFree tip calculator: get the tip, the total and each person's share in seconds. Includes US tipping norms, worked examples and quick answers.