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Create BMI-calculator.py
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‎44-BMI-calculator/BMI-calculator.py‎

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import sys
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import os
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import tkinter as tk
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from tkinter import messagebox
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# =========================
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# THEME
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# =========================
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APP_BG = "#121212"
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PANEL_BG = "#1F1F1F"
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BTN_BG = "#2C2C2C"
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ACCENT = "#FF6F61"
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TEXT_CLR = "#E0E0E0"
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SUBTEXT_CLR = "#AAAAAA"
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INPUT_BG = "#333333"
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INPUT_FG = "#FFFFFF"
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FONT = ("Segoe UI", 11)
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# =========================
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# APP
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# =========================
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class BMICalculatorApp:
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def __init__(self, root):
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self.root = root
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root.title("MateTools – BMI Calculator")
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root.geometry("1000x520")
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root.configure(bg=APP_BG)
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root.resizable(False, False)
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# =========================
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# LEFT PANEL
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# =========================
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left = tk.Frame(root, bg=PANEL_BG, width=420)
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left.pack(side="left", fill="y")
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header = tk.Frame(left, bg=PANEL_BG)
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header.pack(fill="x", padx=16, pady=(18, 10))
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tk.Label(
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header,
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text="MateTools",
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bg=PANEL_BG,
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fg=ACCENT,
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font=("Segoe UI", 20, "bold")
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).pack(side="left")
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tk.Frame(left, bg=ACCENT, height=2).pack(fill="x", padx=16, pady=(0, 14))
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tk.Label(
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left,
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text="BMI Calculator",
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bg=PANEL_BG,
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fg=TEXT_CLR,
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font=("Segoe UI", 14, "bold")
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).pack(anchor="w", padx=16, pady=(0, 2))
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tk.Label(
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left,
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text="Calculate your Body Mass Index",
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bg=PANEL_BG,
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fg=SUBTEXT_CLR,
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font=("Segoe UI", 10)
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).pack(anchor="w", padx=16, pady=(0, 16))
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tk.Frame(left, bg=BTN_BG, height=1).pack(fill="x", padx=16, pady=(0, 16))
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# =========================
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# INPUT FIELDS
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# =========================
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input_frame = tk.Frame(left, bg=PANEL_BG)
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input_frame.pack(padx=16, pady=16, fill="x")
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tk.Label(input_frame, text="Height (cm):", bg=PANEL_BG, fg=TEXT_CLR, font=FONT).pack(anchor="w")
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self.height_entry = tk.Entry(input_frame, bg=INPUT_BG, fg=INPUT_FG, font=FONT)
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self.height_entry.pack(fill="x", pady=(0, 10))
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tk.Label(input_frame, text="Weight (kg):", bg=PANEL_BG, fg=TEXT_CLR, font=FONT).pack(anchor="w")
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self.weight_entry = tk.Entry(input_frame, bg=INPUT_BG, fg=INPUT_FG, font=FONT)
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self.weight_entry.pack(fill="x", pady=(0, 10))
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# =========================
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# BUTTONS
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# =========================
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btn_frame = tk.Frame(left, bg=PANEL_BG)
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btn_frame.pack(fill="x", padx=16, pady=16)
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def make_btn(text, cmd, color=BTN_BG):
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return tk.Button(
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btn_frame,
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text=text,
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command=cmd,
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bg=color,
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fg="white",
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font=("Segoe UI", 11, "bold"),
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relief="flat",
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height=2,
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width=18
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)
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make_btn("Calculate BMI", self.calculate_bmi, ACCENT).pack(side="left", expand=True, padx=4)
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make_btn("About", self.show_about, BTN_BG).pack(side="left", expand=True, padx=4)
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# =========================
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# RIGHT PANEL
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# =========================
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right = tk.Frame(root, bg=APP_BG)
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right.pack(side="right", fill="both", expand=True)
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self.result_card = tk.Frame(right, bg=PANEL_BG)
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self.result_card.pack(padx=30, pady=40, fill="both", expand=True)
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tk.Label(
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self.result_card,
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text="Your BMI Result",
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bg=PANEL_BG,
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fg=TEXT_CLR,
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font=("Segoe UI", 16, "bold")
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).pack(pady=(20, 10))
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# BMI Value display
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self.bmi_value_label = tk.Label(
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self.result_card,
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text="--",
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bg=PANEL_BG,
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fg=ACCENT,
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font=("Segoe UI", 40, "bold")
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)
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self.bmi_value_label.pack(pady=(10, 5))
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# BMI Status display
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self.bmi_status_label = tk.Label(
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self.result_card,
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text="Enter your height and weight to calculate BMI",
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bg=PANEL_BG,
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fg=SUBTEXT_CLR,
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font=("Segoe UI", 16, "bold")
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)
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self.bmi_status_label.pack(pady=(5, 20))
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# BMI Progress Bar
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self.bmi_bar_bg = tk.Frame(self.result_card, bg="#333333", height=30)
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self.bmi_bar_bg.pack(fill="x", padx=40, pady=(10, 0))
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self.bmi_bar_fg = tk.Frame(self.bmi_bar_bg, bg=ACCENT, width=0, height=30)
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self.bmi_bar_fg.place(x=0, y=0)
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# BMI labels along the bar
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self.bmi_labels_frame = tk.Frame(self.result_card, bg=PANEL_BG)
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self.bmi_labels_frame.pack(fill="x", padx=40, pady=(5, 0))
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tk.Label(self.bmi_labels_frame, text="Underweight", bg=PANEL_BG, fg="#87CEEB", font=("Segoe UI", 10)).pack(side="left")
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tk.Label(self.bmi_labels_frame, text="Normal", bg=PANEL_BG, fg="#32CD32", font=("Segoe UI", 10)).pack(side="left", expand=True)
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tk.Label(self.bmi_labels_frame, text="Overweight", bg=PANEL_BG, fg="#FFD700", font=("Segoe UI", 10)).pack(side="left")
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tk.Label(self.bmi_labels_frame, text="Obesity", bg=PANEL_BG, fg="#FF4500", font=("Segoe UI", 10)).pack(side="right")
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# =========================
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# METHODS
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# =========================
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def calculate_bmi(self):
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try:
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height_cm = float(self.height_entry.get())
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weight_kg = float(self.weight_entry.get())
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if height_cm <= 0 or weight_kg <= 0:
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raise ValueError
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height_m = height_cm / 100
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bmi = weight_kg / (height_m ** 2)
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bmi = round(bmi, 2)
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# Determine BMI status and color
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if bmi < 18.5:
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status = "Underweight"
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color = "#87CEEB"
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elif 18.5 <= bmi < 25:
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status = "Normal weight"
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color = "#32CD32"
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elif 25 <= bmi < 30:
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status = "Overweight"
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color = "#FFD700"
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else:
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status = "Obesity"
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color = "#FF4500"
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# Update BMI number and status
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self.bmi_value_label.config(text=str(bmi), fg=color)
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self.bmi_status_label.config(text=status, fg=color)
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# Update progress bar
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# Scale BMI from 0-40 as max width
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max_width = self.bmi_bar_bg.winfo_width() or 400
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bmi_width = min(bmi / 40, 1) * max_width
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self.bmi_bar_fg.config(width=bmi_width, bg=color)
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except ValueError:
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messagebox.showerror("Invalid input", "Please enter valid numeric values for height and weight.")
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def show_about(self):
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messagebox.showinfo(
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"About",
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"MateTools – BMI Calculator\n\n"
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"• Calculate Body Mass Index (BMI)\n"
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"• Provides BMI category with color-coded visual\n\n"
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"Built by MateTools"
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)
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# =========================
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# RUN
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# =========================
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if __name__ == "__main__":
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root = tk.Tk()
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BMICalculatorApp(root)
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root.mainloop()

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