diff --git a/.changeset/slider-number-input-step-modifiers.md b/.changeset/slider-number-input-step-modifiers.md
new file mode 100644
index 0000000000..026a2e78f8
--- /dev/null
+++ b/.changeset/slider-number-input-step-modifiers.md
@@ -0,0 +1,15 @@
+---
+"@zag-js/number-input": minor
+"@zag-js/slider": minor
+---
+
+Fixed issue where `Cmd`/`Ctrl` + arrow keys produced values off the `step` grid (e.g. non-integer values when
+`step: 1`). Stepping with modifier keys now stays aligned to `step`.
+
+Replaced the implicit modifier-based stepping with explicit, configurable props:
+
+- **Slider**: added `largeStep` (defaults to `10 * step`) used when `Shift` or `PageUp`/`PageDown` is pressed.
+- **Number Input**: added `largeStep` (defaults to `10 * step`, on `Shift`) and `smallStep` (defaults to `step / 10`, on
+  `Alt`).
+
+The defaults preserve the previous stepping magnitudes, so existing behavior is unchanged unless the new props are set.
diff --git a/.nvmrc b/.nvmrc
index a45fd52cc5..b832e4001d 100644
--- a/.nvmrc
+++ b/.nvmrc
@@ -1 +1 @@
-24
+24.16.0
diff --git a/e2e/number-input.e2e.ts b/e2e/number-input.e2e.ts
index dfcefb495d..79498dd24f 100644
--- a/e2e/number-input.e2e.ts
+++ b/e2e/number-input.e2e.ts
@@ -100,18 +100,33 @@ test.describe("number input", () => {
     await I.seeInputHasValue("0")
   })
 
-  test("ctrl+arrowup: should change for 0.1 steps", async () => {
-    await I.controls.num("step", "0.1")
+  test("alt+arrowup: should change by smallStep", async () => {
+    await I.type("0")
+
+    await I.pressKey("Alt+ArrowUp")
+    await I.seeInputHasValue("0.1")
 
-    await I.type("0.10", { delay: 20 })
-    await I.pressKey("Control+ArrowUp")
-    await I.seeInputHasValue("0.11")
+    await I.pressKey("Alt+ArrowUp")
+    await I.seeInputHasValue("0.2")
 
-    await I.pressKey("Control+ArrowDown")
+    await I.pressKey("Alt+ArrowDown")
     await I.seeInputHasValue("0.1")
+  })
 
-    await I.pressKey("ArrowDown")
-    await I.seeInputHasValue("0")
+  test("should respect custom smallStep and largeStep", async () => {
+    await I.controls.num("largeStep", "5")
+    await I.controls.num("smallStep", "0.25")
+
+    await I.type("0")
+
+    await I.pressKey("Shift+ArrowUp")
+    await I.seeInputHasValue("5")
+
+    await I.pressKey("Alt+ArrowUp")
+    await I.seeInputHasValue("5.25")
+
+    await I.pressKey("Alt+ArrowDown")
+    await I.seeInputHasValue("5")
   })
 
   test("inc click: should increment value", async () => {
diff --git a/e2e/slider.e2e.ts b/e2e/slider.e2e.ts
index cf7acdffed..173e077319 100644
--- a/e2e/slider.e2e.ts
+++ b/e2e/slider.e2e.ts
@@ -54,6 +54,37 @@ test.describe("slider", () => {
     await I.seeValueText("0")
   })
 
+  test("[keyboard] should stay on the step grid regardless of modifier keys", async () => {
+    await I.focusThumb()
+
+    // meta/ctrl/alt + arrow should move by `step`, never a fraction of it
+    await I.pressKey("Meta+ArrowRight")
+    await I.seeValueText("1")
+
+    await I.pressKey("Control+ArrowRight")
+    await I.seeValueText("2")
+
+    await I.pressKey("Alt+ArrowRight")
+    await I.seeValueText("3")
+
+    await I.pressKey("Alt+ArrowLeft")
+    await I.seeValueText("2")
+  })
+
+  test("[keyboard] should respect a custom largeStep", async () => {
+    await I.controls.num("largeStep", "5")
+    await I.focusThumb()
+
+    await I.pressKey("Shift+ArrowRight")
+    await I.seeValueText("5")
+
+    await I.pressKey("PageUp")
+    await I.seeValueText("10")
+
+    await I.pressKey("PageDown")
+    await I.seeValueText("5")
+  })
+
   test("[pointer] should set value on click track", async () => {
     await I.mousedownAt({ x: 0.8 })
     await I.seeThumbIsFocused()
diff --git a/packages/docs/data/accessibility.json b/packages/docs/data/accessibility.json
index f0e9513631..842e7be39e 100644
--- a/packages/docs/data/accessibility.json
+++ b/packages/docs/data/accessibility.json
@@ -335,19 +335,19 @@
       },
       {
         "keys": ["PageUp"],
-        "description": "<span>Increases the value by a larger step</span>"
+        "description": "<span>Increases the value by the <code>largeStep</code> amount.</span>"
       },
       {
         "keys": ["PageDown"],
-        "description": "<span>Decreases the value by a larger step</span>"
+        "description": "<span>Decreases the value by the <code>largeStep</code> amount.</span>"
       },
       {
         "keys": ["Shift + ArrowUp"],
-        "description": "<span>Increases the value by a larger step</span>"
+        "description": "<span>Increases the value by the <code>largeStep</code> amount.</span>"
       },
       {
         "keys": ["Shift + ArrowDown"],
-        "description": "<span>Decreases the value by a larger step</span>"
+        "description": "<span>Decreases the value by the <code>largeStep</code> amount.</span>"
       },
       {
         "keys": ["Home"],
@@ -710,12 +710,20 @@
         "description": "Decrements the value of the number input by a predefined step."
       },
       {
-        "keys": ["PageUp"],
-        "description": "Increments the value of the number input by a larger predefined step."
+        "keys": ["Shift + ArrowUp"],
+        "description": "Increments the value of the number input by the `largeStep` amount."
       },
       {
-        "keys": ["PageDown"],
-        "description": "Decrements the value of the number input by a larger predefined step."
+        "keys": ["Shift + ArrowDown"],
+        "description": "Decrements the value of the number input by the `largeStep` amount."
+      },
+      {
+        "keys": ["Alt + ArrowUp"],
+        "description": "Increments the value of the number input by the `smallStep` amount."
+      },
+      {
+        "keys": ["Alt + ArrowDown"],
+        "description": "Decrements the value of the number input by the `smallStep` amount."
       },
       {
         "keys": ["Home"],
diff --git a/packages/docs/data/api.json b/packages/docs/data/api.json
index 293dca73a0..11ce064a6b 100644
--- a/packages/docs/data/api.json
+++ b/packages/docs/data/api.json
@@ -3768,6 +3768,16 @@
         "description": "The amount to increment or decrement the value by",
         "defaultValue": "1"
       },
+      "largeStep": {
+        "type": "number | undefined",
+        "description": "The amount to increment or decrement the value by when the `Shift` key is held.",
+        "defaultValue": "10 * step"
+      },
+      "smallStep": {
+        "type": "number | undefined",
+        "description": "The amount to increment or decrement the value by when the `Alt` key is held.",
+        "defaultValue": "step / 10"
+      },
       "allowMouseWheel": {
         "type": "boolean | undefined",
         "description": "Whether to allow mouse wheel to change the value"
@@ -5240,6 +5250,11 @@
         "description": "The step value of the slider",
         "defaultValue": "1"
       },
+      "largeStep": {
+        "type": "number | undefined",
+        "description": "The step value of the slider when the `Shift` key is held, or the\n`PageUp`/`PageDown` keys are used.",
+        "defaultValue": "10 * step"
+      },
       "minStepsBetweenThumbs": {
         "type": "number | undefined",
         "description": "The minimum permitted steps between multiple thumbs.\n\n`minStepsBetweenThumbs` * `step` should reflect the gap between the thumbs.\n\n- `step: 1` and `minStepsBetweenThumbs: 10` => gap is `10`\n- `step: 10` and `minStepsBetweenThumbs: 2` => gap is `20`",
diff --git a/packages/machines/number-input/src/number-input.connect.ts b/packages/machines/number-input/src/number-input.connect.ts
index aeb62e9717..74138a2dcc 100644
--- a/packages/machines/number-input/src/number-input.connect.ts
+++ b/packages/machines/number-input/src/number-input.connect.ts
@@ -2,7 +2,7 @@ import {
   ariaAttr,
   dataAttr,
   getEventPoint,
-  getEventStep,
+  getEventStepValue,
   getWindow,
   isComposingEvent,
   isLeftClick,
@@ -177,7 +177,11 @@ export function connect<T extends PropTypes>(
           if (readOnly) return
           if (isComposingEvent(event)) return
 
-          const step = getEventStep(event) * prop("step")
+          const step = getEventStepValue(event, {
+            step: prop("step"),
+            largeStep: prop("largeStep"),
+            smallStep: prop("smallStep"),
+          })
 
           const keyMap: EventKeyMap<HTMLInputElement> = {
             ArrowUp() {
diff --git a/packages/machines/number-input/src/number-input.machine.ts b/packages/machines/number-input/src/number-input.machine.ts
index 662c5ca459..8ce0dd5d11 100644
--- a/packages/machines/number-input/src/number-input.machine.ts
+++ b/packages/machines/number-input/src/number-input.machine.ts
@@ -44,6 +44,8 @@ export const machine = createMachine({
       max: Number.MAX_SAFE_INTEGER,
       spinOnPress: true,
       ...props,
+      largeStep: props.largeStep ?? 10 * step,
+      smallStep: props.smallStep ?? step / 10,
       translations: {
         incrementLabel: "increment value",
         decrementLabel: "decrease value",
diff --git a/packages/machines/number-input/src/number-input.props.ts b/packages/machines/number-input/src/number-input.props.ts
index 0147fe2f58..1248e695ec 100644
--- a/packages/machines/number-input/src/number-input.props.ts
+++ b/packages/machines/number-input/src/number-input.props.ts
@@ -16,6 +16,7 @@ export const props = createProps<NumberInputProps>()([
   "ids",
   "inputMode",
   "invalid",
+  "largeStep",
   "locale",
   "max",
   "min",
@@ -27,6 +28,7 @@ export const props = createProps<NumberInputProps>()([
   "pattern",
   "required",
   "readOnly",
+  "smallStep",
   "spinOnPress",
   "step",
   "translations",
diff --git a/packages/machines/number-input/src/number-input.types.ts b/packages/machines/number-input/src/number-input.types.ts
index ea1d399a3b..7bea1d7272 100644
--- a/packages/machines/number-input/src/number-input.types.ts
+++ b/packages/machines/number-input/src/number-input.types.ts
@@ -111,6 +111,16 @@ export interface NumberInputProps extends LocaleProperties, CommonProperties {
    * @default 1
    */
   step?: number | undefined
+  /**
+   * The amount to increment or decrement the value by when the `Shift` key is held.
+   * @default 10 * step
+   */
+  largeStep?: number | undefined
+  /**
+   * The amount to increment or decrement the value by when the `Alt` key is held.
+   * @default step / 10
+   */
+  smallStep?: number | undefined
   /**
    * Whether to allow mouse wheel to change the value
    */
@@ -177,11 +187,11 @@ type PropsWithDefault =
   | "pattern"
   | "translations"
   | "step"
+  | "largeStep"
+  | "smallStep"
   | "spinOnPress"
   | "min"
   | "max"
-  | "step"
-  | "translations"
 
 type ComputedContext = Readonly<{
   /**
diff --git a/packages/machines/slider/src/slider.connect.ts b/packages/machines/slider/src/slider.connect.ts
index bf30de61ee..016982d558 100644
--- a/packages/machines/slider/src/slider.connect.ts
+++ b/packages/machines/slider/src/slider.connect.ts
@@ -3,7 +3,7 @@ import {
   dataAttr,
   getEventKey,
   getEventPoint,
-  getEventStep,
+  getEventStepValue,
   isLeftClick,
   isModifierKey,
 } from "@zag-js/dom-query"
@@ -213,7 +213,7 @@ export function connect<T extends PropTypes>(service: SliderService, normalize:
           if (event.defaultPrevented) return
           if (!interactive) return
 
-          const step = getEventStep(event) * prop("step")
+          const step = getEventStepValue(event, { step: prop("step"), largeStep: prop("largeStep") })
 
           const keyMap: EventKeyMap = {
             ArrowUp() {
diff --git a/packages/machines/slider/src/slider.machine.ts b/packages/machines/slider/src/slider.machine.ts
index 9cabca324f..c6ba28f098 100644
--- a/packages/machines/slider/src/slider.machine.ts
+++ b/packages/machines/slider/src/slider.machine.ts
@@ -58,6 +58,7 @@ export const machine = createMachine<SliderSchema>({
       thumbCollisionBehavior: "none",
       minStepsBetweenThumbs,
       ...props,
+      largeStep: props.largeStep ?? 10 * step,
       defaultValue: normalize(defaultValue, min, max, step, minStepsBetweenThumbs),
       value: props.value ? normalize(props.value, min, max, step, minStepsBetweenThumbs) : undefined,
       max,
diff --git a/packages/machines/slider/src/slider.props.ts b/packages/machines/slider/src/slider.props.ts
index 0303047591..73979eba2a 100644
--- a/packages/machines/slider/src/slider.props.ts
+++ b/packages/machines/slider/src/slider.props.ts
@@ -13,6 +13,7 @@ export const props = createProps<SliderProps>()([
   "id",
   "ids",
   "invalid",
+  "largeStep",
   "max",
   "min",
   "minStepsBetweenThumbs",
diff --git a/packages/machines/slider/src/slider.types.ts b/packages/machines/slider/src/slider.types.ts
index 154d4bd98a..3d91ff8581 100644
--- a/packages/machines/slider/src/slider.types.ts
+++ b/packages/machines/slider/src/slider.types.ts
@@ -112,6 +112,12 @@ export interface SliderProps extends DirectionProperty, CommonProperties {
    * @default 1
    */
   step?: number | undefined
+  /**
+   * The step value of the slider when the `Shift` key is held, or the
+   * `PageUp`/`PageDown` keys are used.
+   * @default 10 * step
+   */
+  largeStep?: number | undefined
   /**
    * The minimum permitted steps between multiple thumbs.
    *
@@ -166,6 +172,7 @@ type PropsWithDefault =
   | "min"
   | "max"
   | "step"
+  | "largeStep"
   | "orientation"
   | "defaultValue"
   | "origin"
diff --git a/packages/utilities/dom-query/src/event.ts b/packages/utilities/dom-query/src/event.ts
index ea7eef26e6..bff8e0af1b 100644
--- a/packages/utilities/dom-query/src/event.ts
+++ b/packages/utilities/dom-query/src/event.ts
@@ -120,14 +120,39 @@ export function getNativeEvent<E>(event: E): NativeEvent<E> {
 const pageKeys = new Set(["PageUp", "PageDown"])
 const arrowKeys = new Set(["ArrowUp", "ArrowDown", "ArrowLeft", "ArrowRight"])
 
-export function getEventStep(event: Pick<KeyboardEvent, "ctrlKey" | "metaKey" | "key" | "shiftKey">) {
-  if (event.ctrlKey || event.metaKey) {
-    return 0.1
-  } else {
-    const isPageKey = pageKeys.has(event.key)
-    const isSkipKey = isPageKey || (event.shiftKey && arrowKeys.has(event.key))
-    return isSkipKey ? 10 : 1
+export function getEventStep(event: Pick<KeyboardEvent, "key" | "shiftKey">) {
+  const isPageKey = pageKeys.has(event.key)
+  const isSkipKey = isPageKey || (event.shiftKey && arrowKeys.has(event.key))
+  return isSkipKey ? 10 : 1
+}
+
+interface EventStepOptions {
+  /**
+   * The default step amount (no modifier key pressed)
+   */
+  step: number
+  /**
+   * The step amount when `Shift` or `PageUp`/`PageDown` is used
+   */
+  largeStep: number
+  /**
+   * The step amount when `Alt` is used. When omitted, the `Alt` key
+   * has no effect and the default `step` is used.
+   */
+  smallStep?: number | undefined
+}
+
+export function getEventStepValue(
+  event: Pick<KeyboardEvent, "key" | "shiftKey" | "altKey">,
+  options: EventStepOptions,
+): number {
+  const { step, largeStep, smallStep } = options
+  const isArrowKey = arrowKeys.has(event.key)
+  if (smallStep != null && event.altKey && isArrowKey) {
+    return smallStep
   }
+  const isLargeStep = pageKeys.has(event.key) || (event.shiftKey && isArrowKey)
+  return isLargeStep ? largeStep : step
 }
 
 export function getEventPoint(event: any, type: "page" | "client" = "client"): { x: number; y: number } {
diff --git a/shared/src/controls.ts b/shared/src/controls.ts
index 28e2be7601..e3378e3f13 100644
--- a/shared/src/controls.ts
+++ b/shared/src/controls.ts
@@ -91,6 +91,8 @@ export const numberInputControls = defineControls({
   allowMouseWheel: { type: "boolean", defaultValue: false },
   spinOnPress: { type: "boolean", defaultValue: true },
   step: { type: "number", defaultValue: 1 },
+  largeStep: { type: "number" },
+  smallStep: { type: "number" },
   min: { type: "number", defaultValue: 0 },
   max: { type: "number", defaultValue: 100 },
   locale: {
@@ -141,6 +143,7 @@ export const sliderControls = defineControls({
   min: { type: "number", defaultValue: 0 },
   max: { type: "number", defaultValue: 100 },
   step: { type: "number", defaultValue: 1 },
+  largeStep: { type: "number" },
 })
 
 export const tabsControls = defineControls({
diff --git a/website/demos/index.tsx b/website/demos/index.tsx
index a97f4c633a..6d1d4d9138 100644
--- a/website/demos/index.tsx
+++ b/website/demos/index.tsx
@@ -509,7 +509,7 @@ const components = {
         invalid: false,
         granularity: {
           default: "day",
-          options: ["day", "month", "year", "hour", "minute", "second"],
+          options: ["day", "hour", "minute", "second"],
         },
         selectionMode: { default: "single", options: ["single", "range"] },
         shouldForceLeadingZeros: false,