v3.25.3
Form N-1A Cover
Nov. 26, 2025
Prospectus [Line Items]  
Document Type 485BPOS
Amendment Flag false
Registrant Name Calamos ETF Trust
Entity Central Index Key 0001579881
Entity Investment Company Type N-1A
Document Period End Date Nov. 26, 2025
Calamos Bitcoin Structured Alt Protection ETF®​ — January [Member]  
Prospectus [Line Items]  
Prospectus Date Nov. 28, 2025
Calamos Bitcoin Structured Alt Protection ETF®​ — April [Member]  
Prospectus [Line Items]  
Prospectus Date Nov. 28, 2025
Calamos Bitcoin Structured Alt Protection ETF®​ — July [Member]  
Prospectus [Line Items]  
Prospectus Date Nov. 28, 2025
Calamos Bitcoin Structured Alt Protection ETF®​ — October [Member]  
Prospectus [Line Items]  
Prospectus Date Nov. 28, 2025
Calamos Bitcoin 90 Series Structured Alt Protection ETF®​ — January [Member]  
Prospectus [Line Items]  
Prospectus Date Nov. 28, 2025
Calamos Bitcoin 90 Series Structured Alt Protection ETF®​ — April [Member]  
Prospectus [Line Items]  
Prospectus Date Nov. 28, 2025
Calamos Bitcoin 90 Series Structured Alt Protection ETF®​ — July [Member]  
Prospectus [Line Items]  
Prospectus Date Nov. 28, 2025
Calamos Bitcoin 90 Series Structured Alt Protection ETF®​ — October [Member]  
Prospectus [Line Items]  
Prospectus Date Nov. 28, 2025
Calamos Bitcoin 80 Series Structured Alt Protection ETF®​ — January [Member]  
Prospectus [Line Items]  
Prospectus Date Nov. 28, 2025
Calamos Bitcoin 80 Series Structured Alt Protection ETF®​ — April [Member]  
Prospectus [Line Items]  
Prospectus Date Nov. 28, 2025
Calamos Bitcoin 80 Series Structured Alt Protection ETF®​ — July [Member]  
Prospectus [Line Items]  
Prospectus Date Nov. 28, 2025
Calamos Bitcoin 80 Series Structured Alt Protection ETF®​ — October [Member]  
Prospectus [Line Items]  
Prospectus Date Nov. 28, 2025