app.py

import streamlit as st

# Set page config
st.set_page_config(page_title="Slab Concrete Calculator", layout="centered")
st.title("🧱 Slab Concrete Calculator")

# Units selection
unit = st.selectbox("Select unit for dimensions:", ["m", "cm", "mm"])

# Input fields
col1, col2, col3 = st.columns(3)
with col1:
    length = st.number_input("Length (L)", min_value=0.0, format="%.2f")
with col2:
    width = st.number_input("Width (W)", min_value=0.0, format="%.2f")
with col3:
    thickness = st.number_input("Thickness (T)", min_value=0.0, format="%.2f")

# Convert all dimensions to meters
conversion_factor = {"m": 1, "cm": 0.01, "mm": 0.001}
factor = conversion_factor[unit]
length_m = length * factor
width_m = width * factor
thickness_m = thickness * factor

# Concrete Ratio Inputs
st.markdown("### 🧮 Concrete Mix Ratio")
col1, col2, col3 = st.columns(3)
with col1:
    cement_ratio = st.number_input("Cement", min_value=0.0, value=1.0)
with col2:
    sand_ratio = st.number_input("Sand", min_value=0.0, value=2.0)
with col3:
    aggregate_ratio = st.number_input("Aggregate", min_value=0.0, value=4.0)

total_ratio = cement_ratio + sand_ratio + aggregate_ratio

# Additional inputs
cement_bag_weight = st.number_input("Cement Bag Weight (kg)", value=50.0)
cement_bag_price = st.number_input("Cement Bag Price ($)", value=0.0)
water_cement_ratio = st.number_input("Water-Cement Ratio", value=0.5)
concrete_price = st.number_input("Concrete Price per m³ ($)", value=0.0)

# Calculate button
if st.button("Calculate"):
    # Step 1: Concrete Volume
    concrete_volume = length_m * width_m * thickness_m

    # Step 2: Dry volume
    dry_volume = concrete_volume * 1.54

    # Step 3: Material Volumes
    cement_volume = (cement_ratio / total_ratio) * dry_volume
    sand_volume = (sand_ratio / total_ratio) * dry_volume
    aggregate_volume = (aggregate_ratio / total_ratio) * dry_volume

    # Step 4: Cement weight & bags
    cement_density = 1440  # kg/m³
    cement_weight = cement_volume * cement_density
    cement_bags = cement_weight / cement_bag_weight

    # Step 5: Water
    water_liters = cement_weight * water_cement_ratio

    # Step 6: Costs
    cement_cost = cement_bags * cement_bag_price
    total_concrete_cost = concrete_volume * concrete_price
    concrete_weight = cement_weight + (sand_volume + aggregate_volume) * 1600  # estimated total mass

    # Results
    st.markdown("### 📊 Results")
    st.write(f"**Concrete Volume:** {concrete_volume:.2f} m³")
    st.write(f"**Dry Concrete Volume:** {dry_volume:.2f} m³")
    st.write(f"**Cement Volume:** {cement_volume:.2f} m³")
    st.write(f"**Cement Weight:** {cement_weight:.2f} kg")
    st.write(f"**Cement Bags:** {cement_bags:.2f} bags")
    st.write(f"**Sand Volume:** {sand_volume:.2f} m³")
    st.write(f"**Aggregate Volume:** {aggregate_volume:.2f} m³")
    st.write(f"**Water Required:** {water_liters:.2f} liters")
    st.write(f"**Cement Cost:** ${cement_cost:.2f}")
    st.write(f"**Concrete Cost:** ${total_concrete_cost:.2f}")
    st.write(f"**Estimated Concrete Weight:** {concrete_weight:.2f} kg")