How the current estimate is built, what changed on October 13, 2026, and the bottom-up model we kept during the air war.
What changed. The headline figure moved from $113.3B to the Pentagon's own tally, $43.6B through September 3, extended at CBO's projected $2–3B a month for the costs that continue. On October 13 that comes to about $47B.
Why. The old counter was a formula: $11.3B for the first six days (the Pentagon's March 11 briefing to senators), then $1B for every day after. The $1B/day rate was a preliminary figure relayed by congressional officials on March 4, during the most intense week of the air campaign. We held it constant for 102 more days, including a ceasefire that began April 8, when our own bottom-up model put standby costs at $40–95M a day. Every official accounting since has landed far lower:
| As of | Source | Official tally | Old formula, same date |
|---|---|---|---|
| Apr 29 | Acting comptroller, House Armed Services | $25B | $65B |
| May 12 | Acting comptroller, House & Senate | $29B | $78B |
| Jun 29 | DoD Lead Inspector General | $33.4B | $113.3B (frozen) |
| Aug 1 | CBO | $38.1B | $113.3B (frozen) |
| Sep 3 | Pentagon to Congress | $43.6B | $113.3B (frozen) |
The $113.3B figure was quoted by other outlets as the war's cost. It overstated the official count by roughly two and a half times, and we're correcting it here rather than leaving it in place.
The war also didn't end on June 16. A memorandum of understanding was signed June 17, but the U.S. reimposed a naval blockade of Iranian ports on July 14, and the memorandum expired August 17 without a deal. Most U.S. service members wounded in the war were injured after July 7. The counter is running again.
How the estimate works now.
/data/estimates.json.What this undercounts. The official figure is incremental Defense Department spending. It leaves out base repairs, veterans' care, interest, and costs to other agencies, and Congress has not yet funded most of it. Treat it as a floor.
The sections below document the original model as it stood during the air war, kept for the record.
Until October 13, 2026, the main tracker used the Pentagon's briefing to Congress: $11.3 billion for the first 6 days (NYT, Catie Edmondson, Mar 11 2026), plus $1 billion/day ongoing (Pentagon preliminary estimate via Nancy Youssef, WSJ). Senator Coons noted the $11.3B figure is likely an undercount — it excludes buildup costs and full munitions replacement.
We also built an independent bottom-up model to understand what's inside that number — and what might be missing from it. This page documents that model in full.
Our independent analysis suggests the Pentagon's $1B/day figure may significantly undercount true costs:
Jennifer Kavanagh (Defense Priorities) estimates the U.S. spent more than $10 billion on air-defense systems alone in the first 48 hours — that's $5B/day just for missile defense. THAAD interceptors cost $12.7M each; Patriot PAC-3 costs $3.7M each. Iran launched 2,000+ drones and 771+ ballistic missiles.
If Kavanagh's estimate is correct, interceptor costs alone are 5x the Pentagon's stated daily rate. The $1B/day figure may reflect only offensive operational costs, excluding the massive defensive expenditure.
Other indicators the true cost exceeds $1B/day:
The Penn Wharton Budget Model estimates $40B–$95B in direct budgetary costs for a conflict under 2 months. At 30 days, that's $1.3B–$3.2B/day. Their total economic impact estimate reaches $210B.
The Center for American Progress, using Brown University's Costs of War lifecycle methodology, estimated >$5B through Day 4 alone — averaging $1.25B/day and including costs the Pentagon figure likely omits (veterans' obligations, debt interest).
We built a phased daily burn-rate model from seven cost categories, using publicly available DoD data. The model produces a mid-range estimate of $155M–$380M/day depending on operational phase — capturing roughly 60–75% of true costs per CBO/RAND cost estimation guidance.
300+ aircraft in theater across 13 airframe types. Per-flight-hour costs are on a full O&S (Operations & Support) basis from DoD Comptroller data unless noted.
Combined naval and aircraft operations estimated at ~$70M/day.
High-value munitions tracked individually from reporting. Thousands of smaller munitions (JDAMs, SDBs, Hellfires, cannon rounds) are captured in the daily operational burn rate.
Specific events with attributable costs, tracked individually from open-source reporting.
Casualty figures on the main page are computed from individual incidents listed below — not a single headline number. Each incident has a unique ID to prevent double-counting. When a new report covers the same event, the existing incident is updated rather than added again.
Totals use the low-end estimate for each incident (shown with "+"). Figures marked with a range reflect uncertainty in reporting. We do not extrapolate or estimate beyond what sources report.
De-duplication rules: (1) Check if a new report refers to the same incident by date/location. (2) If a new article gives a cumulative total, reconcile against existing incidents — don't add the difference as a new event. (3) "Died of wounds" updates the existing incident.
Even our bottom-up model captures only a fraction of the true cost:
We cross-checked our model against published third-party estimates:
| Source | Their Estimate | Our Model | Notes |
|---|---|---|---|
| Pentagon → Congress (Mar 11) | >$11.3B first 6 days | $11.3B (adopted) | Now drives our counter's first-week base cost. ~$1.88B/day avg. |
| Pentagon preliminary (WSJ) | $1B/day ongoing | $1B/day (adopted) | Drives the ongoing daily rate after Day 6. |
| Anadolou Agency (first 24 hrs, discrete costs) | $779M | $780M | Validates our discrete event tracking. |
| CSIS (first 100 hours) | $3.7B | $891M/day avg | Aligns with Pentagon $1B/day figure. |
| WaPo (munitions, first 48 hrs) | $5.6B | ~$890M tracked | Open-source captures ~16% of actual munitions spend. |
| IPS/Nat'l Priorities Project (equip. O&S) | $59.4M/day | ~$70M/day | IPS partial; excludes personnel, fuel, munitions. |
| CAP (through Day 4, lifecycle basis) | >$5B | ~$1.8B | Gap: lifecycle costs, pre-strike costs, interceptors. |
| Penn Wharton (total economic) | $210B max | — | Different domain: macro-economic impact. |