American Express Membership Rewards is a one of two major credit card transfer partners that allow you to transfer points directly to your Marriott Bonvoy account (the other being Chase Ultimate Rewards). Membership Rewards points can be converted to Marriott Bonvoy points at a 1:1 ratio.
Conversion Rate
Membership Rewards points can be transferred to Marriott Bonvoy at a 1:1 ratio. This means that every 1,000 AMEX points you transfer will give you 1,000 Marriott Bonvoy points.
You can transfer as little as 1,000 AMEX points and as many as 999,000 AMEX points at a time. Transfers to Marriott Bonvoy must be done in 1,000-point increments and you must have at least 1,000 AMEX points in your account to initiate a transfer.

Transfers from AMEX Membership Rewards to Marriott Bonvoy can take up to 48 hours to be reflected in your balance, but it usually only takes a few minutes. You may have to log out and back in a few times or clear your history to see the update faster.
Conversion Calculator
Use the Conversion Calculator to calculate the transfer of American Express Membership Rewards points to Marriott Bonvoy points.
Other Ways To Earn Marriott Points
Transferring Membership Rewards points to Marriott Bonvoy is a great way to top off your Marriott Bonvoy account, but you can also earn points using several other programs as well as Marriott's own co-branded credit cards.
Marriott Bonvoy
Marriott offers a whopping six credit cards that you can use to earn Marriott Bonvoy points via everyday spending and intro bonuses. This is the easy way to obtain a large amount of points directly to your Marriott Bonvoy account.
You can earn Marriott Bonvoy points using these credit cards:
Chase Ultimate Rewards
The Chase Ultimate Rewards program is the other major credit card rewards program that allows you to transfer points directly to your Marriott Bonvoy account. Ultimate Rewards points can be transferred to Marriott Bonvoy at a rate of 1,000 Ultimate Rewards points for 1,000 Marriott Bonvoy points.
There are several credit cards you can use to earn Ultimate Rewards points, but you can only transfer points directly to Marriott using these three Ultimate Rewards credit cards:
FAQ
Can you transfer AMEX points to Marriott Bonvoy?
Yes. Membership Rewards points can be transferred to Marriott Bonvoy at a rate of 1,000 AMEX points for 1,000 Marriott Bonvoy points.
How long does it take for AMEX points to transfer to Marriott Bonvoy?
Up to 48 hours, but it typically only takes a few minutes.
What is the AMEX points to Marriott Bonvoy points ratio?
1,000 AMEX points transferred to Marriott is 1,000 Marriott Bonvoy points.
How many AMEX points can you transfer to Marriott Bonvoy?
You can transfer as little as 1,000 Membership Rewards points and as many as 999,000 Membership Rewards points in a transaction.
Does it cost to transfer AMEX points to Marriott Bonvoy?
No. AMEX does not charge any fee to transfer Membership Rewards points to Marriott Bonvoy.