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 If you find an outdated assumption, send the page URL and source so we can review it.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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Health BMI Calculator
Body mass index and healthy weight range.
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Health Due Date Calculator
Estimated pregnancy due date and week-by-week milestones.
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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
Health Calculators
Math & Utility
✓ 100% free, no account needed ✓ Calculations run in your browser ✓ Updated for 2026 tax rates ✓ Mobile-friendly
Featured Guides
All articles → Health 8 min read
What Is a Healthy BMI?
What BMI means, how the categories work, and when body mass index needs extra context.
Health 8 min read
How Many Calories Should I Eat Per Day?
Use TDEE to estimate maintenance calories, fat-loss targets, and a realistic starting point.
Math & Utility 7 min read
How to Calculate Exact Age
Learn how years, months, and days are calculated from a birth date without manual guesswork.
Health 8 min read
How to Calculate Your Due Date
Naegele's Rule, ultrasound dating, IVF methods, and the 40-week timeline explained.
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