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Health
BMI, calorie needs, body fat, heart rate zones, and other health and fitness calculators based on standard clinical formulas (Mifflin-St Jeor, US Navy method, and similar) — useful for tracking trends, not a substitute for medical advice.
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Finance
Loan payments, compound interest, budgeting, retirement savings, and tax estimates — calculators built around the same formulas banks and financial planners use, with the math shown so you can check it yourself.
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401k calculator
Estimate how much your 401(k) could grow with contributions, employer match and investment returns.
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AB Test Calculator
Estimate the sample size needed for an A/B test and see the expected confidence intervals.
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affordability calculator
Calculates budget-friendly affordability for a car purchase using income, expenses, savings, loan terms, and target payment.
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Age Calculator
Calculate your exact age in years, months, and days from a birthdate.
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Algebra Calculator
Solves common algebra steps like simplifying, factoring, and solving equations. Good for checking work and seeing the steps.
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amortization calculator
Calculate precise loan amortization schedules, monthly payment breakdowns, and total interest costs for mortgages, auto loans, and personal loans. Analyze payment allocation between principal and interest with detailed amortization analysis and debt management planning tools. Professional loan calc…
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