Build calculator
Choose an aircraft level and how far each system is upgraded, and this works out what the aircraft's numbers become. Up to 4 builds at once, so two builds of one airframe or four different ones can be read against each other.
These numbers are calculated, not published. Every other figure in Merge is the wiki's and can be checked against it. These are the game's percentages with our arithmetic on them: percentages add up rather than compounding, and the result is truncated rather than rounded, both of which were measured rather than assumed.
For your own aircraft, Starform's official planner signs you in and works from your real hangar, which is the one thing this cannot do. It is the authority; this is a calculator for aircraft you do not own yet.
Every figure in the grid is a base stat with percentages applied. A column is one build. Each stat cell holds two bars on one scale: the upper one is what that aircraft starts at, the lower one is what the build turns it into, and the difference in their lengths is the upgrade. The bar is always the value, so on a stat where less is better a shorter bar is the better one and the colour is what says so.
Every base belongs to the aircraft named at the top of its own column, not to the row. Four builds can be four different airframes with four different starting points, which is the reason the base is drawn per column rather than once.
You can pick every branch yourself, or weight what you care about and have them picked for you. A weighted build is a starting point rather than a locked one: every fork it chose says so, says what the two branches scored and why, and can be changed by hand afterwards without losing the rest.
Tiers are cumulative. A system at tier 6 owns tiers 1 through 6, and from tier 5 upward each tier is a choice between two upgrades that you cannot both have. The aircraft level gates which tiers are available at all, and gives hit points of its own on top of anything the Fuselage adds.
Effects the game applies to figures the wiki does not publish are listed by name in their own table instead of moving a number. Several branch pairs differ only in those, so leaving them out would draw two different choices as the same one.
A number marked ? rests on an inferred effect. Every effect here is confirmed except Overall Acceleration and Overall Turn Rate, which are read as covering the stats those words cover rather than having been watched change in game. If the game means something narrower by them, those numbers move too far.
Builds
0 of 4No builds yet.
Add an aircraft above and it arrives fully upgraded at level 20, on the first branch of every split, ready to be taken apart. Add a second one, or a second build of the same aircraft, to compare them.
Where this model comes from
The percentages are the game's, transcribed from the MetalStorm wiki as it stood on 2026-08-18. The arithmetic on them is ours. Percentages sum and apply once to the base stat, then the result is truncated. Both rules are observed, not assumed: the hit point track sums to exactly 50.0% at level 20, and an in-game +2% on an F-5 turned 660.96 into 660, 587.52 into 587 and 385.56 into 385, all of which would have rounded up.
Checked twice, which is the reason to trust it: Fuselage all-TOP to tier 8 on an F-5 Tiger at aircraft level 18, matching the official planner's aggregate on every figure. A tier 1 upgrade applied in game then matched the model on all five stats it moved. Neither check is a guarantee for every branch, and the wiki warns that Starform tunes mechanics without notice.