Defect Rate, DPMO & Six Sigma Calculator

def calculate_defect_metrics(units_inspected, defective_units, total_defects, opps_per_unit=1):
    """
    Calculate Defect Rate, DPU, DPMO and Six Sigma Level.
    """
    defect_rate = (defective_units / units_inspected) * 100.0
    yield_rate = 100.0 - defect_rate
    dpu = total_defects / units_inspected
    
    total_opportunities = units_inspected * opps_per_unit
    dpmo = (total_defects / total_opportunities) * 1_000_000.0
    
    return defect_rate, yield_rate, dpu, dpmo

# Inputs
Inspected = 2500
Defective = 60
Defects = 90
Opportunities = 12

d_rate, y_rate, dpu_val, dpmo_val = calculate_defect_metrics(Inspected, Defective, Defects, Opportunities)

print(f"Defect Rate: {d_rate:.2f}%")
print(f"Process Yield: {y_rate:.2f}%")
print(f"DPU: {dpu_val:.4f} defects/unit")
print(f"DPMO: {dpmo_val:,.0f} DPMO")

function [defect_rate, yield_rate, dpu, dpmo] = calculate_defects(inspected, defective, defects, opps)
    % Calculate Defect Rate, DPU and DPMO
    defect_rate = (defective / inspected) * 100;
    yield_rate = 100 - defect_rate;
    dpu = defects / inspected;
    dpmo = (defects / (inspected * opps)) * 1000000;
end

% Example
Inspected = 2500;
Defective = 60;
Defects = 90;
Opps = 12;

[d_rate, y_rate, dpu_val, dpmo_val] = calculate_defects(Inspected, Defective, Defects, Opps);
fprintf('Defect Rate: %.2f%%\n', d_rate);
fprintf('DPMO: %.0f\n', dpmo_val);