DTOD: Distance Calculation, Mileage Pay, and Disputes

DTOD military mileage is the distance figure the Department of Defense uses to pay you for a PCS or TDY move, produced by the Defense Table of Official Distances at dtod.transport.mil and applied through the Joint Travel Regulations regardless of what your odometer, phone, or car GPS shows.¹ Every branch is required to use it, and the Defense Travel System pulls the number automatically when you file.

What DTOD Is and Who Runs It

U.S. Transportation Command (USTRANSCOM) maintains DTOD and hosts the site.¹ The underlying engine is a military-specific version of PC*MILER, a commercial routing platform from Trimble Maps (formerly ALK Technologies), customized beyond the commercial edition to include military installations, specific piers at naval bases, and restricted airfields that ordinary mapping tools leave out.²

The data is refreshed as roads change, and a full update is released annually, typically effective October 1 to line up with the federal fiscal year.² That annual cycle matters later, when a move crosses fiscal years.

How the Distance Is Calculated

DTOD routes over a network of truck-usable highways. The algorithm sticks to roads that heavy commercial vehicles can legally travel, and it excludes residential streets, low-clearance bridges, and weight-restricted routes. That is the single biggest reason DTOD numbers diverge from consumer GPS output: a phone app is solving for the fastest personal drive, while DTOD is solving for a route a freight truck could lawfully take.

The system uses a precision hierarchy for endpoints. When both origin and destination are installations in the database, it calculates gate-to-gate. When one or both are not, it falls back to the geographic center of the five-digit ZIP code.² You can query DTOD by city and state, ZIP, installation name, or Standard Point Location Code, though direct site access requires DoD-affiliated authentication.

Every distance is calculated to the hundredth of a mile, then rounded to the nearest tenth using a half-round-up method. A raw result of 123.256 becomes 123.3; 123.246 becomes 123.2.³

How That Number Turns Into Money

The Joint Travel Regulations require DTOD mileage for calculating travel payments. Your reimbursement is the DTOD distance multiplied by the applicable per-mile rate, and there are two rate structures depending on why you are traveling.⁴

PCS Moves

For a permanent change of station, you receive the Monetary Allowance in Lieu of Transportation (MALT). The rate effective January 1, 2026 is $0.205 per mile.⁴ MALT is not intended to reimburse every cost of driving your household across the country; it is a flat payment in place of the government booking you a commercial seat. A 1,500-mile PCS at this rate produces $307.50, and the DTOD distance is the only mileage that counts.

TDY Travel

Temporary duty pays a higher per-mile rate because it typically covers round-trip fuel and wear on your personal vehicle. Effective January 1, 2026, the TDY privately owned vehicle rate is $0.725 per mile for a car, $0.705 for a motorcycle, and $1.78 per mile for a privately owned airplane.⁴

Which DTOD Version Governs Your Voucher

This one catches people. The DTOD version that controls your reimbursement is not the version in place when your orders were cut, or when you left. Under the Joint Travel Regulations, the version programmed in the Defense Travel System on the date your voucher is approved for payment is the one used.⁵ Because updates typically land on October 1, a move that crosses the fiscal year boundary may be calculated against a different dataset than the one you checked before departing. The shift is usually small, but a road addition or a route correction can move the total by a few miles.

Why the Number Doesn’t Match Your Odometer

Nearly everyone who compares DTOD to their odometer or to Google Maps finds a different number. A few reasons account for the gap:

Routing logic. DTOD stays on truck-legal highways. Your phone may send you along faster roads a heavy vehicle could not use.
Endpoints. If either end is not an installation in the database, DTOD measures from the center of the ZIP code, which may sit miles from your actual door.
No personal detours. DTOD calculates one authorized path. It does not account for fuel stops, construction reroutes, or the scenic route you actually drove.
Rounding. Consumer GPS tools and DTOD round differently, which can nudge identical routes apart by a fraction of a mile.

The DTOD figure remains the official distance for reimbursement even when it does not match your odometer, even when its route looks impractical, and even when you suspect an error. That status holds until USTRANSCOM processes a formal correction.²

Challenging a Distance You Think Is Wrong

If you believe DTOD has a genuine routing error, you can request a review through the DTOD 24-Hour HelpDesk at 1-800-462-2176.² Have ready:

Your DTOD origin location
Your DTOD destination location
A clear explanation of why the distance appears wrong

The DTOD team forwards reported errors to Trimble Maps, and the vendor makes the final determination. Approved corrections take effect either in the next annual October 1 update or through an emergency override for significant errors. Until then, the existing distance stays on your voucher. Filing a challenge does not pause or adjust the reimbursement you are currently owed.

“My odometer says it was farther” is not enough on its own. The HelpDesk is looking for genuine routing errors, such as DTOD sending traffic through a road that does not exist or missing a direct highway connection. A shorter DTOD result because you chose a different route is the system working as designed.

1
U.S. Transportation Command. Defense Table of Official Distances
2
Defense Table of Official Distances. Defense Table of Official Distances (DTOD) – Help
3
Military Surface Deployment and Distribution Command. SDDC Rounding and Mileage Customer Carrier Advisory
4
Defense Travel Management Office. Mileage Rates
5
Defense Travel Management Office. Joint Travel Regulations (JTR)