Investing Calculators

How Compound Interest Actually Builds Wealth

Starting at 25 instead of 35 can double your retirement balance without saving an additional dollar. Here is the math — and why it matters more than almost any other financial concept.

How to Evaluate Any Investment Opportunity

Most bad investments looked good before you wrote the check. Here is the evaluation framework that separates credible opportunities from compelling stories.

How Much Interest Will You Earn on Your Savings?

At 5% APY, $50,000 earns $2,500/year in interest — but compounding frequency and reinvestment change the actual number. Here is how to calculate it precisely.

Is This Bond a Good Investment? Calculate Yield to Maturity

A bond's coupon rate tells you almost nothing. Yield to maturity is the number that actually matters — and it's rarely what the sticker says.

Is a Certificate of Deposit the Best Option for Your Savings?

CDs offer guaranteed returns with FDIC protection — but locking your money up has a real cost. Here's how to decide when a CD beats keeping money in a HYSA.

How Fast Is Your Asset Losing Value?

The depreciation method you choose determines when you get your deductions. Front-loaded methods like MACRS give you more cash sooner — and that timing has real financial value.

Is This Investment's Return Actually Worth It?

Every investment return needs context: compared to what risk, over what period, versus what alternative? Here is how to evaluate whether a return is genuinely worth your capital.

What Is Future Money Worth in Today's Dollars?

A promise of $100,000 in 15 years is not worth $100,000 today. Here is how to calculate present value — and why it changes almost every financial decision.

Will Your Mutual Fund Grow Enough to Meet Your Goals?

Most actively managed mutual funds underperform their benchmark index after fees over 10+ years. Here is how to calculate whether yours is on track — or costing you money.

What Is Your Real Investment Return?

Your brokerage shows 9% returns. Inflation ran 4%. Fees took 0.5%. Your real return is 4.3% — half what the headline number suggests. Here is how to calculate it accurately.

How Long Until This Investment Pays for Itself?

Payback period answers the most intuitive investment question: when do I get my money back? Here is how to calculate both simple and discounted versions — and when each matters.

Will This Rental Property Actually Make Money?

Most rental properties in high-cost markets have negative cash flow at today's rates. Here is how to calculate whether a specific property actually makes financial sense.