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Standard, scientific, unit converter, and programmer calculators — ready to use. Plus 188+ free specialist calculators.
Popular Calculators
Choose from our ever-growing collection of 188+ calculators to suit your needs.
Mortgage Calculator
Calculate monthly mortgage payment (PITI), full amortization schedule, PMI drop-off, and extra payment savings.
Open Calculator →Paycheck Calculator (Take-Home Pay)
Calculate US take-home pay after federal income tax, Social Security, Medicare, and state income tax. Supports pre-tax 401(k), HSA, and health insurance.
Open Calculator →Online BMI Calculator (Adults)
Calculate your Body Mass Index (BMI) for adults. Get your BMI category, health risk level, and personalized recommendations. Free, instant, no signup.
Open Calculator →Creatinine Clearance Calculator (Cockcroft-Gault)
Estimate creatinine clearance with the 1976 Cockcroft-Gault formula. Used on most FDA drug labels for renal dose adjustment. Supports mg/dL and umol/L, kg and lb, and IBW/AdjBW correction for obese patients.
Open Calculator →Square Root Calculator
Compute square roots, cube roots, and nth roots with principal value, simplified radical form, and imaginary handling.
Open Calculator →Factoring Calculator (Polynomial & Number)
Prime factorization, divisors, GCD/LCM, and quadratic factoring with discriminant and roots.
Open Calculator →Need a Calculator That’s Not Listed?
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