Quick Formula Calculator

Design your own calculators with variables, functions and units. Organize by tags, preview results, keep history, and use a handy date calculator for study, work and life

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.