Marriott Points to Miles Calculator

The formula

miles received(P)    = floor(P ÷ 3) + bonus × floor(P ÷ 60,000)
                       bonus = 5,000 (most airlines), 10,000 (United),
                               0 (American, Avianca LifeMiles, Delta)
points to transfer   = smallest P (at least 3,000) with miles received ≥ miles needed

hotel value given up = points to transfer × your hotel ¢ per point ÷ 100
break-even ¢/mile    = hotel value given up ÷ miles the award needs × 100
transfer vs hotel    = (cash fare − award taxes) − hotel value given up

The calculator tries every count of full 60,000-point blocks and keeps the smallest transfer that reaches your number. A positive “transfer vs hotel” means the flight saves you more cash than the hotel nights you give up. The break-even counts only the miles the award uses, not leftover miles. Terms are from Marriott’s points-to-miles page, read September 26, 2026: 3:1 with most programs; 5,000 bonus miles per 60,000 points; 10,000 for United MileagePlus; no bonus for American AAdvantage, Avianca LifeMiles or Delta SkyMiles; 3,000 to 240,000 points a day.

Run your numbers

Worked example (hypothetical numbers)

These numbers are hypothetical, not quotes. An award needs 22,000 miles in a “most programs” airline. The same flight sells for $520 in cash, and the award adds $6 in taxes. You value Marriott points at 0.7¢ each, because that is what the hotel nights you usually book return.

• Flat 3:1 with no bonus: 22,000 × 3 = 66,000 points.
• One full block: 60,000 points = 20,000 miles + 5,000 bonus = 25,000 miles. It covers the award with 6,000 fewer points and leaves 3,000 miles in the account.
• Hotel value given up: 60,000 × 0.7 ÷ 100 = $420.
• Cash the award saves: $520 − $6 = $514.
• Transfer vs hotel: $514 − $420 = +$94. The flight wins, at 0.86¢ per Marriott point.

Change the airline and the answer moves. For United the same 60,000 points return 30,000 miles, so 8,000 are left over. For Delta there is no bonus: the award needs the full 66,000 points, worth $462 in hotels, and the margin falls to $52. If the cash fare were $400, the Delta transfer would lose.

When is this calculator the wrong test?

• You also hold bank points that reach the same airline. Even with the bonus, a Marriott transfer costs 2.4 points per mile (60,000 for 25,000). Chase, Amex, Citi, Capital One and Bilt Rewards reach many of the same programs at or near 1:1. Price the award from each in the which-points calculator before you spend hotel points.
• The leftover miles have no use. The calculator does not give leftover miles a value. If 3,000 or 8,000 miles would sit in a program you rarely fly, treat them as worth nothing. See how to avoid orphaned miles.
• The seat is not bookable yet. Marriott’s program terms (section 3.6, read September 27, 2026) say the miles post “within one (1) week” in most cases, and that once miles are ordered the points cannot be re-credited. Find the seat in the airline program first. See whether you can hold an award seat before transferring.
• The transfer is split. The same terms pay the bonus only when the points are sent in a single transaction that reaches the 60,000-point threshold. Two transfers of 30,000 earn no bonus; one of 60,000 does. Above 240,000 points, send each day’s share as one transaction of full blocks.
• The names do not match. Marriott says the name on the airline account must match your Marriott first and last name for most airlines, so for those you cannot send points to another person’s airline account.
• Air New Zealand. Marriott converts to Airpoints at 200:1 with a 75-Airpoint bonus, a different scale that this tool does not model.

Your hotel value per point is the input that decides the verdict. Use a real stay: the cash rate of a night you would actually book, divided by its points price, times 100. A higher number makes the transfer harder to justify. The full checklist before you move points is in our Marriott points to airline miles guide.