Turn any idea into a calculator you can trust. Formula Calculator lets you build custom calculators with variables, functions and units—perfect for study, engineering, finance, science and daily life.

【Core Features】

• Build Your Own Calculators
- Define inputs with friendly names and default values
- Choose units (kg, m, USD, etc.) for clear results
- Write expressions using common math functions
- Control decimal places for precise outputs
- Preview results instantly while typing

• Organize Everything
- Use tags to group formulas (geometry, statistics, BMI, physics, finance)
- Search across all formulas in seconds
- Sort by name, time, or custom order
- Reuse sub-formulas to keep complex projects tidy

• Never Lose Your Work
- Every calculation saved to History automatically
- Recalculate with one tap
- Export data when needed
- Keep progress across sessions

• Built-in Date Calculator
- Find days before/after any date
- Calculate the number of days between two dates
- Perfect for planning and deadlines

【Perfect For】

- Students - Geometry, physics, statistics calculations
- Engineers - Custom engineering formulas
- Finance - Compound interest, ROI, loan calculations
- Daily Life - BMI, cooking conversions, date planning

Clean design, instant feedback, and powerful tools make this the one "formula calculator" you'll use every day. Build once, use forever.