Which FreeFixo calculator would you use most? (feedback before launch)

FreeFixo launches tomorrow (July 7) with 125+ free calculators across finance, health, legal, travel, and business. Zero tracking, no signup, forever free — everything runs in your browser.

I want to make sure the most-used calculators are polished before launch. Which category would you actually reach for?

💰 Finance: mortgage, loan payoff, debt avalanche/snowball, retirement, compound interest, tax estimator

🏥 Health: BMI, TDEE/calorie deficit, macro calculator, pregnancy due date, body fat

⚖️ Legal: alimony, child support, severance pay, small claims

✈️ Travel: currency converter, timezone, trip cost estimator

💼 Business: invoice generator, profit margin, break-even, VAT calculator

Drop your answer below — I'll personally make sure that calculator is sharp for launch day. And if there's something missing you'd genuinely use, tell me that too.