Global military expenditure reached US$2.887 trillion in2025, but a supplier's market depends on relevant programmes, accessible purchasing routes and delivery timing. A defensible estimate connects those layers.
SIPRI's April 2026 fact sheet estimates world military expenditure at US$2.887 trillion in 2025, up 2.9% in real terms. It reports substantial differences between regions and countries, and explains that the updated dataset replaces previously published figures. SIPRI's 2025 spending release
For a defence business, the total describes the scale of resources devoted to military activity. It is a useful starting point for understanding broad demand conditions. A sales forecast requires a different level of evidence: which organisations need the product, what they can purchase, and when a supplier can realistically deliver it.
The gap between those two levels is where weak market estimates often arise. A very small percentage of a very large spending total can produce an impressive revenue target without identifying a single plausible customer.
SIPRI's definition includes personnel, operations and maintenance, procurement, military research and development, infrastructure and specified military-aid expenditure. Its methodology describes spending as an input measure, rather than a direct measure of military capability. It also warns that differences in available national data can limit close comparisons between countries. SIPRI's sources and methods
This scope matters commercially. Salaries and pensions contribute to military expenditure but are not equipment purchases available to a technology manufacturer. Maintenance can create supplier opportunities, but only in the relevant service categories and contractual arrangements.
A company should therefore avoid describing the entire spending total as its addressable market. It can use the total to explain the wider context while building the commercial estimate from the activities its product can actually serve.
A spending increase can reflect several things: more activity, higher prices, different exchange rates or a change in what the data includes. Real growth and nominal currency totals answer different questions.
A supplier selling in a particular currency may care about current purchasing budgets and its own input costs. A researcher comparing countries over time may prefer a consistent price basis. Neither should silently substitute one measure for the other.
For example, a company's revenue forecast in euros cannot be derived simply by taking a percentage of a historical constant-dollar series. The forecast needs its own pricing, currency and delivery assumptions.
The practical safeguard is straightforward: retain the source's unit, year and price basis alongside the number. When a commercial model converts it, document the conversion rather than presenting the result as another official statistic.
NATO's own explanation distinguishes national contributions from common funding. Member countries bear the costs of their national forces and capabilities, while common budgets support Alliance-wide functions and programmes. NATO identifies its civil budget, military budget and security investment programme as the principal common-funded budgets. NATO's funding explanation
For a supplier, this means that an aggregate figure for allied defence expenditure does not identify a single buyer. The relevant opportunity may be a national procurement, a NATO agency contract, a prime-contractor purchase or another programme arrangement.
Combining them into one market total can also double count the same underlying activity. A programme's national contribution and a supplier's resulting contract are connected financial records, rather than independent pools of demand.
The commercial model should follow the buyer responsible for the purchase. That provides a more useful basis for account research and product positioning.
Consider a hypothetical company offering software for managing equipment maintenance records. Its potential market is not all defence software, still less all military expenditure.
The relevant customer group might consist of organisations operating equipment fleets with the data, support processes and purchasing arrangements the product can serve. Some may already have a suitable system. Others may need integration into an existing prime's service rather than a direct software purchase.
A practical estimate begins with those organisations and the work required to serve them. It then considers the likely contract unit: a site, a fleet, a supported user group or a service package. The price basis follows the actual offering.
This approach may produce a smaller initial market than a percentage of global spending. It also identifies the customer evidence that would justify expanding the estimate.
A programme may be relevant to the technology while remaining commercially inaccessible to the company in its present form. The obstacle could be product maturity, integration resources, supplier qualification, required support capacity or the structure of the purchasing arrangement.
That does not make the programme irrelevant. It changes the route and timing. A partnership might provide a realistic role as a component supplier. Further product work might make a later procurement accessible.
The market estimate should record those conditions. Treating every technically related budget line as immediately addressable hides the investment needed to compete.
This is also where cost evidence matters. The FFI analysis of traceable cost assumptions explains why a buyer must be able to connect a supplier's proposal with the wider project. A company cannot estimate accessible revenue convincingly if its own delivery scope remains undefined.
Tender and award notices can provide more specific evidence than top-level budgets, but they introduce their own counting problems. A procurement may produce an initial notice, amendments, several lots and later award information.
Adding every published amount can overstate the market. A revised notice may replace an earlier value; a framework ceiling may cover purchases that are never made; a contract modification may relate to an existing programme.
Our explanation of deduplicating procurement notices addresses this directly. The related guide to searching defence tenders with buyer names, keywords and CPV codes helps identify the relevant records before estimating their value.
The important editorial habit is to preserve the relationship between records. A notice is evidence about a procurement, not automatically a separate opportunity.
Even a well-defined market is larger than the revenue a particular business can capture. Sales capacity, evaluation time, integration effort and support commitments all constrain the forecast.
For the maintenance-software example, ten interested organisations may require more concurrent integration work than the supplier can provide. A staged rollout could create a credible revenue path; assuming all ten become full customers in the same quarter would ignore delivery capacity.
The model should also distinguish first installations from repeat revenue. Customer retention, support cost and product reuse determine whether the business becomes easier to grow after the first sale.
These assumptions are company judgements, not facts supplied by SIPRI. Keeping them separate allows readers or partners to assess the argument and challenge the parts that drive the result.
SIPRI's figures are valuable because they place national and regional expenditure within a consistent research framework. They can help identify markets worth closer investigation and reveal broad changes in resource allocation.
The commercial work begins when that context is connected to a relevant product, an identifiable purchaser and a plausible delivery sequence. Each step narrows the estimate while improving its usefulness.
For a defence-tech founder, the strongest market statement is therefore one that can explain its path from broad spending to specific customers. The result may be less dramatic than a claim to capture a fraction of trillions, but it is far more useful for deciding what to build, where to sell and which relationships deserve sustained effort.
SIPRI's public April 2026 fact-sheet summary and its public sources-and-methods page were accessible and reviewed on 6 September 2026. The spending total, real growth and methodological scope are supported by those pages. The underlying database was not independently recalculated; market-sizing implications are BDI analysis.
Suggest a correction