diff --git a/internal/site/src/components/alerts/alerts-sheet.tsx b/internal/site/src/components/alerts/alerts-sheet.tsx
index 94e4e3b30..845aa0746 100644
--- a/internal/site/src/components/alerts/alerts-sheet.tsx
+++ b/internal/site/src/components/alerts/alerts-sheet.tsx
@@ -10,6 +10,7 @@ import { Checkbox } from "@/components/ui/checkbox"
 import { DialogDescription, DialogHeader, DialogTitle } from "@/components/ui/dialog"
 import { DropdownMenu, DropdownMenuContent, DropdownMenuItem, DropdownMenuTrigger } from "@/components/ui/dropdown-menu"
 import { Input } from "@/components/ui/input"
+import { Select, SelectContent, SelectItem, SelectTrigger, SelectValue } from "@/components/ui/select"
 import { Switch } from "@/components/ui/switch"
 import { Tabs, TabsContent, TabsList, TabsTrigger } from "@/components/ui/tabs"
 import { toast } from "@/components/ui/use-toast"
@@ -17,7 +18,7 @@ import { alertInfo } from "@/lib/alerts"
 import { pb } from "@/lib/api"
 import { $alerts, $systems } from "@/lib/stores"
 import { cn, debounce } from "@/lib/utils"
-import type { AlertInfo, AlertRecord, SystemRecord } from "@/types"
+import type { AlertInfo, AlertRecord, AlertUnit, SystemRecord } from "@/types"
 
 const Slider = lazy(() => import("@/components/ui/slider"))
 
@@ -27,6 +28,24 @@ const alertDebounce = 400
 
 const alertKeys = Object.keys(alertInfo) as (keyof typeof alertInfo)[]
 
+/** Round to a multiple of step, trimming float noise like 0.30000000000000004 */
+const roundToStep = (val: number, step: number) => Number((Math.round(val / step) * step).toFixed(6))
+
+/** Number input step and minimum for a unit, which may be finer than the slider */
+const getInputRange = ({ min, step, inputStep = step }: AlertUnit) => ({ step: inputStep, min: Math.min(min, inputStep) })
+
+/** Index of the unit to display a stored value in: the largest unit whose input range and step fit it */
+function getUnitIndex(units: AlertUnit[], value: number) {
+	for (let i = units.length - 1; i > 0; i--) {
+		const { min, step } = getInputRange(units[i])
+		const val = value / units[i].factor
+		if (val >= min && val <= units[i].max && Math.abs(roundToStep(val, step) - val) < 1e-6) {
+			return i
+		}
+	}
+	return 0
+}
+
 const failedUpdateToast = (error: unknown) => {
 	console.error(error)
 	toast({
@@ -245,7 +264,17 @@ export function AlertContent({
 
 	const [checked, setChecked] = useState(global ? false : !!alert)
 	const [min, setMin] = useState(alert?.min || (noDuration ? 0 : 10))
-	const [value, setValue] = useState(alert?.value ?? (noThreshold ? 0 : (alertData.start ?? 80)))
+	const { units } = alertData
+	const storedValue = alert?.value ?? (noThreshold ? 0 : (alertData.start ?? 80))
+	const [unitIndex, setUnitIndex] = useState(() => (units ? getUnitIndex(units, storedValue) : 0))
+	/** Selected threshold unit, if the alert has selectable units */
+	const unit = units?.[unitIndex]
+	const factor = unit?.factor ?? 1
+	const unitLabel = unit?.unit ?? alertData.unit
+	const { min: valueMin, max: valueMax, step = 1 } = unit ?? alertData
+	const { min: inputMin, step: inputStep } = unit ? getInputRange(unit) : { min: valueMin, step }
+	/** Threshold value in the selected unit */
+	const [value, setValue] = useState(() => Number((storedValue / factor).toFixed(6)))
 
 	const Icon = alertData.icon
 
@@ -267,12 +296,12 @@ export function AlertContent({
 		return systemIds
 	}
 
-	function sendUpsert(min: number, value: number) {
+	function sendUpsert(min: number, value: number, valueFactor = factor) {
 		const systems = getSystemIds()
 		systems.length &&
 			upsertAlerts({
 				name: alertKey,
-				value,
+				value: Number((value * valueFactor).toFixed(6)),
 				min,
 				systems,
 			})
@@ -326,7 +355,7 @@ export function AlertContent({
 											Average drops below{" "}
 											<strong className="text-foreground">
 												{value}
-												{alertData.unit}
+												{unitLabel}
 											</strong>
 										</Trans>
 									) : (
@@ -334,7 +363,7 @@ export function AlertContent({
 											Average exceeds{" "}
 											<strong className="text-foreground">
 												{value}
-												{alertData.unit}
+												{unitLabel}
 											</strong>
 										</Trans>
 									)}
@@ -345,9 +374,9 @@ export function AlertContent({
 										value={[value]}
 										onValueCommit={(val) => sendUpsert(min, val[0])}
 										onValueChange={(val) => setValue(val[0])}
-										step={alertData.step ?? 1}
-										min={alertData.min ?? 1}
-										max={alertData.max ?? 99}
+										step={step}
+										min={valueMin ?? 1}
+										max={valueMax ?? 99}
 									/>
 									<Input
 										type="number"
@@ -355,17 +384,45 @@ export function AlertContent({
 										onChange={(e) => {
 											let val = parseFloat(e.target.value)
 											if (!Number.isNaN(val)) {
-												if (alertData.max != null) val = Math.min(val, alertData.max)
-												if (alertData.min != null) val = Math.max(val, alertData.min)
+												// keep values on the step grid so the unit can be inferred on reload
+												if (unit) val = roundToStep(val, inputStep)
+												if (valueMax != null) val = Math.min(val, valueMax)
+												if (inputMin != null) val = Math.max(val, inputMin)
 												setValue(val)
 												sendUpsert(min, val)
 											}
 										}}
-										step={alertData.step ?? 1}
-										min={alertData.min ?? 1}
-										max={alertData.max ?? 99}
+										step={inputStep}
+										min={inputMin ?? 1}
+										max={valueMax ?? 99}
 										className="w-16 h-8 text-center px-1"
 									/>
+									{units && (
+										<Select
+											value={String(unitIndex)}
+											onValueChange={(index) => {
+												const next = units[Number(index)]
+												const nextInput = getInputRange(next)
+												// convert the current threshold to the new unit, clamped to its range
+												const val = roundToStep((value * factor) / next.factor, nextInput.step)
+												const clamped = Math.min(Math.max(val, nextInput.min), next.max)
+												setUnitIndex(Number(index))
+												setValue(clamped)
+												sendUpsert(min, clamped, next.factor)
+											}}
+										>
+											<SelectTrigger className="w-auto shrink-0 h-8 gap-1.5 px-2.5">
+												<SelectValue />
+											</SelectTrigger>
+											<SelectContent>
+												{units.map(({ unit }, i) => (
+													<SelectItem key={unit} value={String(i)}>
+														{unit.trim()}
+													</SelectItem>
+												))}
+											</SelectContent>
+										</Select>
+									)}
 								</div>
 							</div>
 						)}
diff --git a/internal/site/src/lib/alerts.ts b/internal/site/src/lib/alerts.ts
index b5f52a7dc..39c6a0f32 100644
--- a/internal/site/src/lib/alerts.ts
+++ b/internal/site/src/lib/alerts.ts
@@ -53,6 +53,11 @@ export const alertInfo: Record<string, AlertInfo> = {
     icon: EthernetIcon,
     desc: () => t`Triggers when combined up/down exceeds a threshold`,
     max: 250,
+    // 1024 to match the hub, which converts bandwidth with 1024 * 1024
+    units: [
+      { unit: " MB/s", factor: 1, min: 1, max: 250, step: 1, inputStep: 0.1 },
+      { unit: " GB/s", factor: 1024, min: 0.1, max: 5, step: 0.1 },
+    ],
   },
   NetworkMonitorLoss: {
     name: () => t`Network Monitor Loss`,
diff --git a/internal/site/src/types.d.ts b/internal/site/src/types.d.ts
index 942b9bc2b..45e3d0fab 100644
--- a/internal/site/src/types.d.ts
+++ b/internal/site/src/types.d.ts
@@ -459,6 +459,20 @@ export interface AlertInfo {
 	/** Additional information that remains visible while the alert is enabled */
 	note?: () => string
 	invert?: boolean
+	/** Selectable threshold units. Values are stored in the first unit (factor 1) */
+	units?: AlertUnit[]
+}
+
+export interface AlertUnit {
+	/** Unit suffix shown after the value */
+	unit: string
+	/** Multiplier converting a value in this unit to the stored value */
+	factor: number
+	min: number
+	max: number
+	step: number
+	/** Finer step for the number input, which also accepts values down to this step */
+	inputStep?: number
 }
 
 export type AlertMap = Record<string, Map<string, AlertRecord>>