Math for Money, Work & Everyday Life
AssetCalculus helps you use clear math to make everyday decisions — from savings, loans, and investing to work, budgets, and practical comparisons. Our free calculators and guides turn numbers into answers you can use.
Everyday Money Math
Use clear calculations to compare real choices involving loans, savings, inflation, investing, and fees.
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Popular Calculators
Compound Interest Calculator
Inflation-Adjusted Return Calculator
Average Cost Basis Calculator
ETF Expense Ratio Impact Calculator
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Here’s the Dividend Yield Calculator, live. Enter a dividend and share price to see it work.
Why Use AssetCalculus?
Everyday decisions shouldn't require guesswork. Our tools and guides are built to be fast, accurate, and easy to understand — whether you're comparing rates, planning long-term growth, estimating work-related numbers, or making sense of everyday costs.
Want to see the math in action? Explore our Blog and practical guides for real examples that connect each decision to a useful calculator.
Latest Guides
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What Stock Price Do You Need to Break Even After Fees?
By Sang Lee — Founder and Editor of AssetCalculus Quick answer: If you buy 100 shares at $45, pay a $5 buy fee, and expect a $5 sell fee, the break-even sale price is $45.10 per share. Selling at the original $45 purchase price would still leave a $10 loss. Break-even price matters whenever commissions,…
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What Annual Return Doubles $10,000 in 10 Years?
By Sang Lee — Founder and Editor of AssetCalculus Quick answer: To turn $10,000 into $20,000 in exactly 10 years with no deposits or withdrawals, you need a compound annual growth rate of approximately 7.18% before taxes and fees. The answer is not 10%. Doubling is a compounding problem: each year’s growth earns additional growth…
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How Much Does a 0.75% ETF Fee Cost on $10,000?
By Sang Lee — Founder and Editor of AssetCalculus Quick answer: If two comparable funds both earn 7% before fees, a $10,000 investment held for 25 years grows to about $53,895.18 with a 0.03% expense ratio and $45,522.22 with a 0.75% expense ratio. The difference is approximately $8,372.95. A 0.72-percentage-point fee gap looks small in…
Popular Questions
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How Much Interest Does $10,000 Earn in a Year?
Quick answer: $10,000 earns $100 in one year at 1%, $300 at 3%, and $500 at 5% using simple annual interest. With monthly or daily compounding, the result can be slightly higher. The exact amount depends on APY, how long the money stays deposited, fees, withdrawals, and taxes. This guide uses clear dollar examples so…
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Is a 4.5% APY on a Savings Account Good Right Now?
Reviewed by Sang Lee | Published by AssetCalculus Yes — as of August 2026, a 4.5% APY sits toward the higher end of what’s broadly available and comfortably beats what most brick-and-mortar bank savings accounts pay (often well under 1%). With the Federal Reserve holding its benchmark rate at a target range of 3.50%–3.75%, top…
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Does a 1% Fee Really Matter Over 30 Years?
Reviewed by Sang Lee | Published by AssetCalculus Yes, and the effect is much bigger than it sounds. A 1% annual expense ratio doesn’t just cost you 1% of your money once; it compounds against you every single year, quietly eating into returns that would otherwise be growing on top of each other. Here’s the…
Latest from the Blog
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Dividend Yield vs. Dividend Payout Ratio: What’s the Difference?
Both numbers come from the same dividend — one tells you what you’re being paid right now, the other tells you how much of the company’s profit that payment is actually using. By Sang Lee — Founder and Editor of AssetCalculus | Published by AssetCalculus Dividend yield and dividend payout ratio are both calculated from…
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What Is an Expense Ratio?
Reviewed by Sang Lee | Published by AssetCalculus An expense ratio is the annual fee a mutual fund or ETF charges to cover its operating costs, expressed as a percentage of your investment in the fund. You never receive a separate invoice for it — the fund deducts it gradually from the fund’s assets throughout…
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ETF vs. Mutual Fund: Which Is Right for You?
Both pool your money with other investors into a basket of stocks, bonds, or other assets — the differences are in how you buy them, what they cost, and how they’re taxed. By Sang Lee — Founder and Editor of AssetCalculus | Published by AssetCalculus An ETF (exchange-traded fund) and a mutual fund can hold…