Everyone quotes a humanoid robot's price — $16,000 for a Unitree G1, $55,000-plus for a dexterous full-size unit, low-$20,000s as the long-run target. Almost nobody breaks down where that money actually goes. This piece models the bill of materials (BOM) component by component, using the most-cited analyst teardown available, and shows why the cost-down fight is really a fight over one part: the actuator.
The headline number: about $55K, and legs eat a third of it
The most widely referenced estimate comes from Morgan Stanley's teardown of a Tesla Optimus Gen 2-class robot, which pegs the total BOM at roughly $55,000. Morgan Stanley's component split, as reported across multiple outlets, looks like this:
| Subassembly | Cost | Share of BOM |
|---|---|---|
| Hands | $9.5K | 17.2% |
| Waist & pelvis | $7.8K | 14.2% |
| Thigh | $7.3K | 13.2% |
| Calf | $7.3K | 13.2% |
| Feet | $6.7K | 12.2% |
| Elbow | $2.6K | 4.7% |
| Forearm | $2.2K | 3.9% |
| Head | $2.1K | 3.8% |
| Shoulder | $2.1K | 3.8% |
| Upper arm | $1.1K | 2.0% |
| Battery pack | $0.3K | 0.5% |
| Other | $0.5K | 0.9% |
Read it as buckets, not gospel — it is one analyst's estimate for one robot. But the shape is striking and consistent with other 2026 estimates: locomotion hardware (thigh, calf, feet, plus pelvis) is roughly $21K, the single largest cost center, and the battery — the part most people assume dominates — is a rounding error at about $300.
The real driver: actuators are ~56% of the BOM
Strip away the body-part labels and one component category explains the cost: actuators. Morgan Stanley puts actuators at about 56% of total BOM. That lines up with independent 2026 estimates that place high-precision joint actuators at 40-55% of a humanoid's hardware cost, rising above 50% on simpler robots that lack dexterous hands or rich sensor suites. In other words, a humanoid is mostly a collection of expensive joints wrapped in structure.
Two actuator types do the damage. Rotary joints use harmonic (strain-wave) reducers; linear joints in the legs use planetary roller screws, which Morgan Stanley reports at $1,350-$2,700 each — and a full-size humanoid carries around a dozen of them. Multiply that out and the leg actuators alone approach the cost of an entire small car. This is why the hands, at $9.5K, are the most expensive single subassembly: a dexterous hand packs many small actuators into a tight space.
Why the cost curve bends toward China
Here is the part buyers should sit with. The two components that set the humanoid cost floor — harmonic reducers and precision servo systems — are exactly the parts Chinese suppliers have driven down hardest. Tesla's own supply chain reflects this: Morgan Stanley notes Optimus harmonic reducers coming from China's Suzhou Green Harmonic, whose reducers a16z estimates are 30-50% cheaper than incumbents Sumitomo and Harmonic Drive. A February 2026 analysis went further, estimating that excluding Chinese parts could roughly triple Optimus's cost.
That is the same reducer-and-servo localization that has been repricing collaborative robots — a dynamic we broke down in why Chinese cobots undercut Western brands and quantified in China's share of the global cobot market. Humanoids inherit that supply chain wholesale, because a humanoid joint and a cobot joint use the same class of parts.
Where the price actually goes from here
The Bank of America Institute's March 2026 "Physical AI" research argues that rapid, simultaneous cost declines across actuators, motors, sensors, batteries and onboard compute are steadily lowering the hardware bill — the mechanism behind every "$20,000 humanoid" projection. The evidence is already on shelves: Unitree lists a G1 around $16,000 and an R1 at $5,900. Those are far simpler machines than a $55K dexterous humanoid, and the gap between them is almost entirely hand complexity and actuator count — the same two lines that dominate the table above.
Our view for buyers and sourcing teams: ignore the sticker price and watch the actuator line. Whoever wins on harmonic reducers and roller screws wins on humanoid cost, and today that fight is being won in China. When you evaluate a humanoid — or price a fleet — the questions that matter are how many actuators it carries, what reducers it uses, and who makes them. For the current state of full-size and desktop humanoid pricing, see our humanoid robot category.
