Crystal Calculator Suite – Daily Fitness EMI and Health Calculator Kotlin app

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Included Calculators & Modules

Crystal Calc Suite is a powerful offline calculator application built with 100% Kotlin and Jetpack Compose. It combines 18+ smart calculators, a comprehensive Fitness Tracker, and an intuitive EMI Loan Calculator into a single modern Android application.

1. Daily Basis Calculators (6-in-1 Crystal Grid)

The Daily Calculator collection helps users manage everyday life with practical financial, productivity, and wellness tools.

• Safe Daily Budget Allowance
  Calculate safe daily spending after deducting monthly bills and savings goals.
• Habit & Subscription Cost Impact
  Analyze the real monthly and yearly cost of subscriptions, coffee, dining, and recurring expenses.
• 24-Hour Time Allocator
  Visualize how daily hours are distributed between sleep, work, exercise, commuting, and free time.
• Hourly Target Pacing
  Calculate hourly hydration and step-count targets throughout the day.
• Daily Meal Budget Divider
  Divide grocery and food budgets into affordable per-meal spending limits.
• Daily Energy Burn Pacing
  Estimate hourly calorie burn goals using BMR and activity targets.

2. Fitness & Athletic Calculators (12-in-1 Crystal Grid)

A complete collection of health and athletic calculators designed for everyday users, gym enthusiasts, and fitness professionals.

• BMI (Body Mass Index) – Calculate body weight category using standard BMI formulas.
• BMR (Basal Metabolic Rate) – Estimate minimum daily calorie requirements using the Mifflin-St Jeor equation.
• TDEE (Total Daily Energy Expenditure) – Calculate total calories burned based on activity level.
• Ideal Target Weight – Determine healthy body weight using Devine and Robinson formulas.
• Body Fat Percentage – Calculate body fat using the US Navy circumference method.
• Target Heart Rate Zones – Display Warm-up, Fat Burn, Cardio, Aerobic, and VO₂ Max training zones.
• 1 Rep Max (1RM) – Estimate maximum lifting capacity using Epley and Brzycki formulas.
• Calorie Deficit Weight Planner – Plan safe calorie deficits for sustainable weight loss.
• Daily Water Intake – Calculate recommended hydration based on body weight and activity level.
• Macronutrient Split – Generate carbohydrate, protein, and fat recommendations for meal planning.
• Waist-to-Height Ratio – Assess body fat distribution and health risk.
• Pace & Speed Calculator – Calculate running and cycling pace and average speed.

3. Financial EMI Loan Calculator

A modern loan calculator for personal, home, vehicle, and business financing.

• Loan Monthly Repayment (EMI)
  Calculate monthly installments using loan amount, interest rate, and repayment period.
• Visual Loan Breakdown
  Display color-coded principal versus interest values for better financial planning.

4. Fitness Tracker & CSV Reports Hub

Track daily activities and monitor long-term progress with built-in analytics.

• Daily Activity Logger
  Record workouts, body weight, calories burned, water intake, and fitness notes.
• Analytics Charts
  View progress using interactive historical graphs and performance statistics.
• CSV Data Export
  Export activity records into CSV format for backup, reporting, or spreadsheet analysis.