Daniel Mercer, CFP®

Daniel Mercer is a Certified Financial Planner™ (CFP®) who spent eight years advising middle-income families at a fee-only planning firm before turning to financial writing full-time. His work focuses on making the mechanics of personal finance — amortization, compounding, tax-advantaged accounts — understandable without dumbing them down. At ToolGrym, Daniel writes the explanations, worked examples, and FAQs that accompany each calculator, and he defines the formulas each tool implements. He believes a calculator you can’t verify by hand is a calculator you shouldn’t trust.