CalcAtlas
Your Ultimate Calculator Suite
Professional calculators for mathematics, finance, and health. Fast, accurate, and easy to use.
Finance Planning Suite
FIRE, dividends, covered calls, Roth vs Traditional, safe withdrawal stress tests — 10 calculators built for serious investors.
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Popular calculators
Basic Calculator
Perform basic arithmetic operations.
CalculatePercentage Calculator
Calculate percentages, percentage change, and ratios.
CalculateRandom Number Calculator
Generate random numbers with min/max range, uniqueness controls, and sorted output.
CalculatePrime Number Checker
Check prime or composite status with smallest divisor, factors, and step-by-step divisibility checks.
CalculatePower & Root Calculator
Calculate powers and roots of numbers.
CalculateRatio Simplifier Calculator
Simplify 2-part and 3-part ratios, handle decimals, generate equivalent ratios, and scale to totals.
CalculateFractions Calculator
Add, subtract, multiply, and divide fractions with step-by-step solutions.
CalculateMean, Median & Mode Calculator
Calculate mean, median, and mode for any list of numbers.
CalculateStandard Deviation
Calculate population and sample standard deviation.
CalculateSequence Calculator
Calculate arithmetic and geometric nth terms, generated terms, finite sums, and convergent infinite geometric sums.
CalculateGCF & LCM Calculator
Find greatest common factor and least common multiple of two or more numbers.
CalculateQuadratic Equation Solver
Solve quadratic equations using the quadratic formula with real and complex roots.
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