Finance-first calculators
The primary site path focuses on mortgage, salary, compound growth, investing, dividend, and AI cost decisions rather than a generic tool directory.
Read methodology →Finance Calculator Hub
Browser-based calculators for money decisions, investing scenarios, and AI API cost planning, with formulas and assumptions shown on the page.
mycalcstool editorial focus
Formulas and limits included
Calculator pages explain the input units, formula, examples, common mistakes, and when the result should be checked against an official source.
Read guides →Corrections are welcome
Rates, rules, and model prices change. If you find an outdated assumption, send the page URL and source so we can review it.
Send correction →Most Popular Right Now
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Most Popular Mortgage Calculator
Monthly payment, total interest, amortization schedule.
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Finance Salary Calculator
Take-home pay after federal and state taxes.
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Investing Stock Average Cost
New average share price after buying more.
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AI Cost ChatGPT API Cost
Estimate monthly API cost from tokens, calls, and pricing.
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Finance Calculators
Methodology →Stock & ETF Calculators
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Stock Average Cost
New average share price after buying more.
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Averaging Down
Break-even after adding to a lower-priced position.
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Stock Return
Profit, loss, and return percentage after costs.
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Dividend Calculator
Annual and after-tax dividend income.
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Dividend Yield
Yield from share price and annual dividend.
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Foreign Stock FX Return
Stock return including exchange rate movement.
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ETF Recurring Investment
Future value from monthly ETF investing.
AI Cost Calculators
Current Editorial Scope
mycalcstool focuses the main navigation on finance, investing, and AI cost calculators. General health, date, and unit tools remain available for users who bookmarked them, while the homepage highlights money and cost decisions first.
✓ 100% free, no account needed ✓ Calculations run in your browser ✓ Updated for 2026 tax rates ✓ Mobile-friendly
Featured Guides
All articles → Money & Finance 8 min read
PMI Guide: What Private Mortgage Insurance Costs and When It Ends
What PMI is, how it affects monthly payments, and when borrowers can usually remove it.
Money & Finance 8 min read
Salary Calculator Guide: Gross Pay vs Net Pay Explained
What gets deducted from a paycheck and how to estimate take-home income.
Money & Finance 9 min read
How Much House Can I Afford?
Estimate affordability from income, debt, down payment, and monthly payment assumptions.
Money & Finance 10 min read
First-Time Homebuyer Guide
Down payment, mortgage math, credit score requirements, and buying power estimates.
Questions or corrections? About· Methodology· golreas@gmail.com