Build 1 publisher2 min readPublished September 27, 2026 at 2:33 AM PDT

Roblox's three concurrent DevEx rates break earnings panels built on one constant

Roblox now pays out one creator balance at three DevEx rates, $0.0035, $0.0038 and $0.0054 per Robux, according to a developer's published rate module. A one-constant earnings panel errs high or low depending on the balance's mix of pre-September-2025 and 18+ Robux.

The Engineer · Build desk

What happened

Roblox raised the standard DevEx rate on September 5, 2025, but Robux held before that date stay at $0.0035 and are the first to cash out.
A separate 18+ rate started June 8, 2026, for passes, developer products, subscriptions and private servers bought by age-verified US players in experiences without R6 avatars.
In the author's example, 75,000 Robux split 20,000 legacy, 50,000 standard and 5,000 18+ is worth $287, against $285 at the new constant and $262.50 at the old one.
The author released the rates as an MIT-licensed Luau ModuleScript with CC BY 4.0 data, built as a table and five functions with no HttpService calls.

Compiled by The EngineerSomething wrong?How this is made

Why it matters

exposure Creators whose balances are mostly pre-September-2025 Robux with few 18+ sales see a standard-rate panel promise them more money than DevEx will pay.
cost For groups cashing out millions of Robux a quarter, the standard constant is off by $300 per million legacy Robux and $1,600 per million 18+ Robux, in opposite directions.
contradiction The post calls a single constant wrong in both directions, but only the $0.0038 constant can overstate; a panel still on $0.0035 always shows creators too little.
decision Earnings panels now have to hold balances as separate legacy, standard and 18+ amounts, since no single rate prices a combined total correctly.

Every calculator and in-game earnings panel the post's author had seen carried one line, `local DEVEX_RATE = 0.0035` ^[1]. The line aged badly on September 5, 2025 ^[2]. Against the standard rate of $0.0038, each legacy Robux is worth $0.0003 less and each 18+ Robux $0.0016 more ^[3]^[1]. A $0.0038 constant therefore overstates a balance whose legacy Robux outnumber its 18+ Robux by more than about 5.3 to one, and understates it below that ratio ^[2]. The worked example runs four to one, so the constant comes out $2 low ^[3].

Cashout order moves the number again. Legacy Robux go out first, according to the post ^[2]. A first cashout needs 30,000 earned Robux, $114 at the standard rate ^[7]. Taken from the example balance, that minimum includes all 20,000 legacy Robux. If the other 10,000 come from the standard bucket, the payout is $108 ^[4]. The post does not say where 18+ Robux fall in the order.

Floats cause the rest of the trouble. Roblox pays in USD, and the author rounds to the cent once, at the end, not per bucket ^[8]. 12,345 Robux at the standard rate is $46.911, shown as $46.91 ^[9]. Converting a dollar target back to Robux needs a ceiling: $100 takes `math.ceil(100 / 0.0038)`, or 26,316 Robux ^[10]. At 26,315 the gross is $99.997. The screen shows $100.00, and the amount is still under $100 gross ^[10]. The author does not know how Roblox rounds on its side, so the UI labels these figures as gross estimates ^[11].

I'd copy two choices in the module. `rateOn` returns the standard rate in force on a given date and skips the 18+ tier on purpose, because that tier runs alongside the standard rate and does not replace it ^[14]^[4]. A check script in CI fails the build if the numbers in the Luau file drift from the JSON ^[15].

That check keeps the two copies of the data in agreement. It cannot see Roblox move a rate ^[15]. "The part that actually breaks things is Roblox changing the rate and nobody updating the constant," the author wrote ^[16]. The repo's answer is manual: a re-check against Roblox's docs at least every 45 days, with the data drawn from LootTally's DevEx rates page ^[17].

What to watch

How Roblox treated Robux that landed before 10am PT on September 5, 2025; the module prices that whole day at the new rate.
Whether Roblox adds further payout tiers; the author wrote that the 18+ rate "reads like a first step, not a final shape."
Whether Roblox documents its rounding and the cashout order across the standard and 18+ buckets, which would let panels show payouts rather than gross estimates.

Claim ledger

Ranked by verification strength, evidence, and original report placement.

[1]
Every DevEx calculator, spreadsheet and in-game earnings panel the author had seen used a single constant: local DEVEX_RATE = 0.0035.
ReportedSupportedSource: dev.to post by the devex-rates module authorView cited source
[2]
The standard DevEx rate went up on September 5, 2025; Roblox did not convert old balances, so Robux held before that date stay at $0.0035 and cash out first.
ReportedSupportedSource: dev.to post by the devex-rates module authorView cited source
[3]
The current standard DevEx rate is $0.0038 per Robux (50,000 standard Robux = $190; robuxToUsd(100000) returns 380).
ReportedSupportedSource: dev.to post by the devex-rates module authorView cited source
[4]
An 18+ rate began June 8, 2026, covering developer products, passes, subscriptions and private servers bought by US players who verified their age, in an experience meeting Roblox's character rules (no R6 avatars). It runs next to the standard rate and does not replace it.
ReportedSupportedSource: dev.to post by the devex-rates module authorView cited source
[5]
The 18+ (us18) DevEx rate is $0.0054 per Robux (5,000 Robux = $27; robuxToUsd(30000, "us18") returns 162).
ReportedSupportedSource: dev.to post by the devex-rates module authorView cited source
[6]
Worked example: 75,000 earned Robux, 20,000 held before September 2025, 50,000 earned since and 5,000 from qualifying 18+ purchases, is worth $287 ($70 + $190 + $27). A single constant at the new rate gives $285; the old constant gives $262.50.
ReportedSupportedSource: dev.to post by the devex-rates module authorView cited source
[7]
A first cashout requires 30,000 earned Robux, which is $114 at the standard rate.
ReportedSupportedSource: dev.to post by the devex-rates module authorView cited source
[8]
Roblox pays in USD; the author rounds to the cent at the end, not per part.
ReportedSupportedSource: dev.to post by the devex-rates module authorView cited source
[9]
12,345 Robux at $0.0038 is 46.911, displayed as $46.91.
ReportedSupportedSource: dev.to post by the devex-rates module authorView cited source
[10]
$100 requires math.ceil(100 / 0.0038) = 26,316 Robux; 26,315 Robux gives 99.997, which rounds to $100.00 on screen but is still under $100 gross.
ReportedSupportedSource: dev.to post by the devex-rates module authorView cited source
[11]
The author does not know exactly how Roblox rounds, so treats the module's figures as gross estimates and says so in the UI.
ReportedSupportedSource: dev.to post by the devex-rates module authorView cited source
[12]
The author published the rates, history and arithmetic as a Luau ModuleScript with no HttpService and no yielding, just a table and five functions, on GitHub at supertj/devex-rates; code is MIT, data is CC BY 4.0.
ReportedSupportedSource: dev.to post by the devex-rates module authorView cited source
[13]
DevExRates.mixedBalanceUsd({ legacy = 20000, standard = 50000, us18 = 5000 }) returns 287.
ReportedSupportedSource: dev.to post by the devex-rates module authorView cited source
[14]
rateOn returns the standard rate in force on a given date and deliberately skips the 18+ tier, since that is a parallel rate and not a change to the standard one.
ReportedSupportedSource: dev.to post by the devex-rates module authorView cited source
[15]
A check script in CI fails if the numbers in the Luau file drift from the JSON.
ReportedSupportedSource: dev.to post by the devex-rates module authorView cited source
[16]
"The part that actually breaks things is Roblox changing the rate and nobody updating the constant."
ReportedSupportedSource: the devex-rates module author, writing on dev.toView cited source
[17]
The author re-checks the rates against Roblox's docs at least every 45 days; the data comes from LootTally's DevEx rates page.
ReportedSupportedSource: dev.to post by the devex-rates module authorView cited source
[d1]
Relative to the $0.0038 standard rate, a legacy Robux is worth $0.0003 less and an 18+ Robux $0.0016 more.
DerivedSupported1 source— sign in to open
[d2]
A $0.0038 constant overstates a balance when legacy Robux exceed about 5.3 times the 18+ Robux, and understates it below that ratio.
DerivedSupported1 source— sign in to open
[d3]
The worked example has a four-to-one legacy-to-18+ ratio, and the standard constant is $2 below the true value.
DerivedSupported1 source— sign in to open
[d4]
A 30,000-Robux first cashout from the example balance, taking all 20,000 legacy Robux first and 10,000 standard Robux, is worth $108, against $114 at a standard-rate constant.
DerivedSupported1 source— sign in to open
[d5]
Per million Robux, a standard-rate constant is $300 too high on legacy Robux and $1,600 too low on 18+ Robux.
DerivedSupported1 source— sign in to open
[d6]
Because every bucket pays at least $0.0035, a $0.0035 constant can never overstate; on the example balance it is $24.50 short.
DerivedSupported1 source— sign in to open
[18]
It is unclear how Roblox handled the 10am PT cutoff on September 5, 2025 for Robux that landed that morning; the module treats the whole day as the new rate.
ReportedInsufficientSource: dev.to post by the devex-rates module authorView cited source
[19]
The author wrote that the 18+ rate "reads like a first step, not a final shape."
ReportedInsufficientSource: dev.to post by the devex-rates module authorView cited source

Sources

Publishers with included, body-backed reporting in this cluster.

dev.to
1 article · September 27, 2026
Roblox has three DevEx rates now. One constant won't cut it.

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Clarity analysis

How the coverage leans and what the record actually supports. Read the methodology

Perspective Coverage

How much of the coverage speaks to builders, operators and investors. It measures emphasis, not whether the story is right.

A creator balance now splits into three buckets: Robux held before September 5, 2025 at $0.0035, later Robux at $0.0038, and qualifying 18+ purchases at $0.0054. Legacy Robux cash out first. The author's MIT-licensed Luau module encodes this, and a CI check keeps the code in step with its JSON data. A $0.0038 constant overstates a balance once legacy Robux exceed about 5.3 times the 18+ Robux, and understates it below that ratio. Only $0.0035 never overstates, and on the author's 75,000-Robux example it came up $24.50 short.

Reality

Evidence, adoption, hype gap, incentives and confidence, each read independently from the current record on the scale shown beneath it. How these are measured.

Evidence50: 0100
One developer's post, arithmetic checks out
The three rates and their start dates come from a single developer's post, which cites Roblox's documentation through LootTally's rate page. We have not seen Roblox's own notices. The numbers recompute cleanly from the stated rates: $287 for the mixed balance, $114 for the 30,000-Robux minimum, and 26,316 Robux for $100 gross.
AdoptionInsufficient: No usage figures
Roblox policy applies the rates to every DevEx creator. The post gives no count of creators earning at the 18+ rate and no usage numbers for the module. Two dated rate changes and a code release are the only adoption events on record.
Hype gap+10: −100 understated0 aligned+100 overstated
Headline slightly louder than the example
"Break" is a strong word for a $2 miss on a $287 balance with the new-rate constant, or $24.50 with the old one. The author concedes the gap "looks small at this size" and argues it matters for groups paying out millions of Robux a quarter. On the direction of the error, which is the post's real claim, the numbers hold.
Incentives40: 0100
Author promotes own tool
The writer is also the publisher of the module being recommended, and sends readers to LootTally's rate page and a DevEx calculator. The post does not say whether the author is connected to LootTally. The code is free, so the commercial pull looks modest.
Confidence55: 0100
Moderate
The math is internally consistent. Every rate and date, though, rests on one post and a secondary rate page. The author flags two open questions, Roblox's rounding and the September 5 morning cutoff; both affect exact payouts at the margin and leave the three-rate structure intact.

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Roblox's three concurrent DevEx rates break earnings panels built on one constant

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