Finance
Simple Interest Calculator
Calculate simple interest on a principal amount.
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General Finance Calculators
Core finance math: interest, APR, present and future value.
Finance
APR Calculator
Find the true annual cost of a loan including fees.
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Future Value Calculator
Calculate what money today will be worth in the future.
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Present Value Calculator
Find today's value of a future sum of money.
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Investing
How Compound Interest Works: Formula, Examples & Calculator
Learn how compound interest works, the A = P(1 + r/n)^(nt) formula, monthly vs yearly compounding, and two worked examples you can check with a free calculator.
7 min readRead guide
LoansAPR vs Interest Rate: What's the Difference?
Learn why a loan's APR is often higher than its interest rate, how fees affect APR, and how to use both when comparing mortgages, personal loans and credit cards.
6 min readRead guide