Current daily oral morphine equivalent dose	Conversion ratio (morphine to methadone)	Conversion factor (approximate percentage of morphine dose)
≤ 100 mg	3 to 1	33.3
101 to 300 mg	5 to 1	20.0
301 to 600 mg	10 to 1	10.0
601 to 800 mg	12 to 1	8.3
801 to 1,000 mg	15 to 1	6.7
≥ 1,001 mg	20 to 1	5.0