Numeraty Authors

Meet the experts who build, test, and explain our calculator methodology.

Alex Crabinsky

Alex Crabinsky

Alex Crabinsky is the founder of Numeraty and a software engineer specializing in financial modeling tools. He builds, tests, and reviews all 215+ calculators with a focus on transparent formulas and practical decision-making.

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Sarah Chen, CFP

Sarah Chen, CFP

Sarah Chen is a Certified Financial Planner (CFP) who reviews Numeraty's calculator formulas, assumptions, and financial guidance for accuracy and clarity.

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Calculators