diff --git a/.changeset/silver-buttons-fly.md b/.changeset/silver-buttons-fly.md
new file mode 100644
index 0000000000..5c4239c0a0
--- /dev/null
+++ b/.changeset/silver-buttons-fly.md
@@ -0,0 +1,10 @@
+---
+'@solid-design-system/components': patch
+'@solid-design-system/docs': patch
+---
+
+Fixed `sd-datepicker`:
+
+- `placement` attribute properly renders the calendar view on top or bottom of the input element.
+- Included screenshot test `Placement`.
+- Improved `readonly` attribute handling.
diff --git a/packages/components/src/components/datepicker/datepicker.test.ts b/packages/components/src/components/datepicker/datepicker.test.ts
index 66464bd455..3b710aa9a5 100644
--- a/packages/components/src/components/datepicker/datepicker.test.ts
+++ b/packages/components/src/components/datepicker/datepicker.test.ts
@@ -120,10 +120,14 @@ describe('<sd-datepicker>', () => {
       el.show();
       await el.updateComplete;
 
-      const dayButton = el.shadowRoot!.querySelector('button.day:not(.out-month):not(.disabled)')!;
-      await clickOnElement(dayButton);
-      await el.updateComplete;
-
+      await waitUntil(
+        () => !!el.shadowRoot!.querySelector<HTMLButtonElement>('button.day:not(.out-month):not(.disabled)'),
+        'No enabled day rendered',
+        { timeout: 0 }
+      );
+      const dayButton = el.shadowRoot!.querySelector<HTMLButtonElement>('button.day:not(.out-month):not(.disabled)')!;
+      dayButton.click();
+      await waitUntil(() => el.value !== null, 'Value not set after click');
       expect(el.value).to.not.be.null;
     });
 
@@ -138,10 +142,14 @@ describe('<sd-datepicker>', () => {
       el.show();
       await el.updateComplete;
 
-      const dayButton = el.shadowRoot!.querySelector('button.day:not(.out-month):not(.disabled)')!;
-      await clickOnElement(dayButton);
-      await el.updateComplete;
-
+      await waitUntil(
+        () => !!el.shadowRoot!.querySelector<HTMLButtonElement>('button.day:not(.out-month):not(.disabled)'),
+        'No enabled day rendered',
+        { timeout: 0 }
+      );
+      const dayButton = el.shadowRoot!.querySelector<HTMLButtonElement>('button.day:not(.out-month):not(.disabled)')!;
+      dayButton.click();
+      await waitUntil(() => el.value !== null, 'Value not set after click');
       expect(changeHandler).to.have.been.calledOnce;
       expect(selectHandler).to.have.been.calledOnce;
     });
@@ -269,13 +277,13 @@ describe('<sd-datepicker>', () => {
   });
 
   describe('form integration', () => {
-    it('readonly prevents typing but allows calendar open', async () => {
+    it('readonly prevents typing and calendar open', async () => {
       const el = await fixture<SdDatepicker>(html`<sd-datepicker readonly></sd-datepicker>`);
       const input = el.shadowRoot!.querySelector<HTMLInputElement>('#input')!;
       input.focus();
       await el.updateComplete;
 
-      expect(input.ariaExpanded).to.equal('true');
+      expect(input.ariaExpanded).to.equal('false');
       const before = input.value;
       await sendKeys({ type: '15012024' });
       await el.updateComplete;
@@ -326,18 +334,28 @@ describe('<sd-datepicker>', () => {
   });
 
   describe('calendar alignment and placement', () => {
-    it('applies alignment classes to calendar', async () => {
-      const elLeft = await fixture<SdDatepicker>(html`<sd-datepicker alignment="left"></sd-datepicker>`);
-      elLeft.show();
-      await elLeft.updateComplete;
-      const calLeft = elLeft.shadowRoot!.querySelector('[part~="datepicker"]')!;
-      expect(calLeft.className).to.include('left-0');
-
-      const elRight = await fixture<SdDatepicker>(html`<sd-datepicker alignment="right"></sd-datepicker>`);
-      elRight.show();
-      await elRight.updateComplete;
-      const calRight = elRight.shadowRoot!.querySelector('[part~="datepicker"]')!;
-      expect(calRight.className).to.include('right-0');
+    it('forwards placement to sd-popup (with alignment)', async () => {
+      const elBottom = await fixture<SdDatepicker>(
+        html`<sd-datepicker placement="bottom" alignment="left"></sd-datepicker>`
+      );
+      elBottom.show();
+      await elBottom.updateComplete;
+      const popupBottom = elBottom.shadowRoot!.querySelector('sd-popup')!;
+      expect(popupBottom.getAttribute('placement')).to.equal('bottom-start');
+
+      const elTop = await fixture<SdDatepicker>(html`<sd-datepicker placement="top" alignment="left"></sd-datepicker>`);
+      elTop.show();
+      await elTop.updateComplete;
+      const popupTop = elTop.shadowRoot!.querySelector('sd-popup')!;
+      expect(popupTop.getAttribute('placement')).to.equal('top-start');
+
+      const elBottomRight = await fixture<SdDatepicker>(
+        html`<sd-datepicker placement="bottom" alignment="right"></sd-datepicker>`
+      );
+      elBottomRight.show();
+      await elBottomRight.updateComplete;
+      const popupBottomRight = elBottomRight.shadowRoot!.querySelector('sd-popup')!;
+      expect(popupBottomRight.getAttribute('placement')).to.equal('bottom-end');
     });
 
     it('updates currentPlacement from sd-popup', async () => {
@@ -345,12 +363,11 @@ describe('<sd-datepicker>', () => {
       el.show();
       await el.updateComplete;
 
-      el.dispatchEvent(
-        new CustomEvent('sd-current-placement', { bubbles: true, composed: true, detail: { placement: 'top' } })
-      );
+      const popup = el.shadowRoot!.querySelector('sd-popup')!;
+      popup.dispatchEvent(new CustomEvent('sd-current-placement', { bubbles: true, composed: true, detail: 'top' }));
       await el.updateComplete;
 
-      expect(el['currentPlacement']).to.equal('bottom');
+      expect(el['currentPlacement']).to.equal('top');
     });
   });
 
diff --git a/packages/components/src/components/datepicker/datepicker.ts b/packages/components/src/components/datepicker/datepicker.ts
index a9ab33a52a..3d48d5fa9b 100644
--- a/packages/components/src/components/datepicker/datepicker.ts
+++ b/packages/components/src/components/datepicker/datepicker.ts
@@ -12,6 +12,7 @@ import { watch } from '../../internal/watch';
 import cx from 'classix';
 import SolidElement from '../../internal/solid-element';
 import type { SolidFormControl } from '../../internal/solid-element';
+import type SdPopup from '../popup/popup';
 
 /**
  * @summary Used to enter or select a date or a range of dates using a calendar view.
@@ -274,6 +275,8 @@ export default class SdDatepicker extends SolidElement implements SolidFormContr
   /** The text value shown in the input, synchronized with selection. */
   @state() private inputValue = '';
 
+  @query('sd-popup') popup: SdPopup;
+
   @query('#invalid-message') invalidMessage: HTMLDivElement;
 
   @query('#input') input: HTMLInputElement;
@@ -326,6 +329,13 @@ export default class SdDatepicker extends SolidElement implements SolidFormContr
     this.formControlController.updateValidity();
   }
 
+  @watch('open', { waitUntilFirstUpdate: true })
+  handleOpenChange() {
+    if (this.popup) {
+      this.popup.active = this.open && !this.disabled && !this.visuallyDisabled;
+    }
+  }
+
   disconnectedCallback() {
     super.disconnectedCallback();
     this.removeEventListener('focusin', this.onFocusIn);
@@ -823,7 +833,7 @@ export default class SdDatepicker extends SolidElement implements SolidFormContr
   };
 
   show() {
-    if (this.open || this.disabled || this.visuallyDisabled) {
+    if (this.open || this.disabled || this.visuallyDisabled || this.readonly) {
       this.open = false;
       return;
     }
@@ -851,7 +861,7 @@ export default class SdDatepicker extends SolidElement implements SolidFormContr
   };
 
   private handleMouseDown(event: MouseEvent) {
-    if (this.visuallyDisabled || this.disabled) {
+    if (this.visuallyDisabled || this.disabled || this.readonly) {
       event.preventDefault();
       event.stopPropagation();
       return;
@@ -869,14 +879,14 @@ export default class SdDatepicker extends SolidElement implements SolidFormContr
   private handleFocus() {
     this.hasFocus = true;
 
-    if (!this.open && !this.disabled && !this.visuallyDisabled) {
+    if (!this.open && !this.disabled && !this.visuallyDisabled && !this.readonly) {
       this.show();
     }
     this.emit('sd-focus');
   }
 
   private handleInput = (ev: Event) => {
-    if (this.disabled || this.visuallyDisabled) {
+    if (this.disabled || this.visuallyDisabled || this.readonly) {
       ev.preventDefault?.();
       ev.stopPropagation?.();
       return;
@@ -1127,8 +1137,12 @@ export default class SdDatepicker extends SolidElement implements SolidFormContr
     this.handleBlur();
   };
 
-  private handleCurrentPlacement = (ev: CustomEvent<{ placement: 'top' | 'bottom' }>) => {
-    this.currentPlacement = ev.detail.placement;
+  private handleCurrentPlacement = (e: CustomEvent<'top' | 'bottom'>) => {
+    const incomingPlacement = e.detail;
+
+    if (incomingPlacement) {
+      this.currentPlacement = incomingPlacement;
+    }
   };
 
   private setMonth(offset: number) {
@@ -1216,6 +1230,9 @@ export default class SdDatepicker extends SolidElement implements SolidFormContr
     direction: -1 | 1,
     isLastHeaderControl: boolean
   ) => {
+    if (this.disabled || this.visuallyDisabled || this.readonly) {
+      return;
+    }
     // Only the last header control sends focus into the grid on Tab
     if (ev.key === 'Tab' && !ev.shiftKey) {
       if (isLastHeaderControl) {
@@ -1236,6 +1253,7 @@ export default class SdDatepicker extends SolidElement implements SolidFormContr
   };
 
   private selectSingleDate(d: Date) {
+    if (this.readonly) return;
     if (this.isDisabled(d)) return;
 
     const localMidnight = DateUtils.startOfDayLocal(d);
@@ -1263,6 +1281,7 @@ export default class SdDatepicker extends SolidElement implements SolidFormContr
   }
 
   private selectRangeDate(d: Date) {
+    if (this.readonly) return;
     const day = DateUtils.startOfDayLocal(d);
     const rs = this.rangeStart ? DateUtils.parseLocalISO(this.rangeStart) : null;
     const re = this.rangeEnd ? DateUtils.parseLocalISO(this.rangeEnd) : null;
@@ -1402,12 +1421,13 @@ export default class SdDatepicker extends SolidElement implements SolidFormContr
   }
 
   private selectDate(d: Date) {
+    if (this.readonly) return;
     if (this.range) this.selectRangeDate(d);
     else this.selectSingleDate(d);
   }
 
   private onKeyDown = (ev: KeyboardEvent) => {
-    if (this.disabled || this.visuallyDisabled) {
+    if (this.disabled || this.visuallyDisabled || this.readonly) {
       ev.preventDefault();
       ev.stopPropagation();
       return;
@@ -1487,7 +1507,7 @@ export default class SdDatepicker extends SolidElement implements SolidFormContr
   };
 
   private handleInputKeyDown = (ev: KeyboardEvent) => {
-    if ((this.disabled || this.visuallyDisabled) && ev.key !== 'Tab') {
+    if ((this.disabled || this.visuallyDisabled || this.readonly) && ev.key !== 'Tab') {
       ev.preventDefault();
       ev.stopPropagation();
       return;
@@ -1513,7 +1533,7 @@ export default class SdDatepicker extends SolidElement implements SolidFormContr
       return;
     }
 
-    if (ev.key === 'Enter' && !this.open && !this.disabled && !this.visuallyDisabled) {
+    if (ev.key === 'Enter' && !this.open && !this.disabled && !this.visuallyDisabled && !this.readonly) {
       ev.preventDefault();
       this.show();
     }
@@ -1585,7 +1605,7 @@ export default class SdDatepicker extends SolidElement implements SolidFormContr
 
   /** Mouse enter on a day: updates preview end when selecting a range. */
   private onDayMouseEnter(day: Date) {
-    if (!this.range) return;
+    if (!this.range || this.readonly) return;
     const rs = this.rangeStart ? DateUtils.parseLocalISO(this.rangeStart) : null;
     const re = this.rangeEnd ? DateUtils.parseLocalISO(this.rangeEnd) : null;
     if (rs && !re) {
@@ -1622,9 +1642,14 @@ export default class SdDatepicker extends SolidElement implements SolidFormContr
     return html`
       <div
         part="datepicker"
-        class="w-[284px] z-50 absolute top-full bg-white border-2 border-t-0 border-primary py-3 px-4 ${this.open
-          ? 'block rounded-bl-default rounded-br-default'
-          : 'hidden'} ${this.alignment === 'left' ? 'left-0' : 'right-0'}"
+        class=${cx(
+          'w-[284px] z-50 bg-white py-3 px-4',
+          this.open ? 'block' : 'hidden',
+          this.currentPlacement?.startsWith('bottom')
+            ? 'border-r-2 border-b-2 border-l-2 rounded-br-default rounded-bl-default'
+            : 'border-r-2 border-t-2 border-l-2 rounded-tr-default rounded-tl-default',
+          'border-primary'
+        )}
       >
         <div class="flex flex-row items-center w-full justify-between mb-3" part="header">
           <div class="flex items-center">
@@ -1814,8 +1839,10 @@ export default class SdDatepicker extends SolidElement implements SolidFormContr
                       aria-colindex=${colIndex + 1}
                       aria-labelledby=${'col-' + (colIndex + 1)}
                       .tabIndex=${tabIndex}
-                      ?disabled=${disabled || this.disabled}
-                      aria-disabled=${disabled || this.visuallyDisabled || this.disabled ? 'true' : 'false'}
+                      ?disabled=${disabled || this.disabled || this.readonly}
+                      aria-disabled=${disabled || this.visuallyDisabled || this.disabled || this.readonly
+                        ? 'true'
+                        : 'false'}
                       aria-selected=${isSelectedSingle || inSelectedRange || isRangeStart || isRangeEnd
                         ? 'true'
                         : 'false'}
@@ -1936,7 +1963,11 @@ export default class SdDatepicker extends SolidElement implements SolidFormContr
               'absolute top-0 w-full h-full pointer-events-none border rounded-default z-10 transition-[border] duration-medium ease-in-out',
               borderColor,
               this.open && this.alignment === 'left' ? 'rounded-bl-none' : '',
-              this.open && this.alignment === 'right' ? 'rounded-br-none' : ''
+              this.open && this.alignment === 'right' ? 'rounded-br-none' : '',
+              this.open &&
+                (this.currentPlacement?.startsWith('bottom')
+                  ? 'rounded-bl-none rounded-br-none'
+                  : 'rounded-tl-none rounded-tr-none')
             )}
           >
             ${hasLabel && this.floatingLabel
@@ -1973,8 +2004,13 @@ export default class SdDatepicker extends SolidElement implements SolidFormContr
           </div>
           <sd-popup
             @sd-current-placement=${this.handleCurrentPlacement}
-            class=${cx('inline-flex relative w-full')}
-            sync="width"
+            class=${cx(
+              'inline-flex relative w-full',
+              this.currentPlacement?.startsWith('bottom') ? 'origin-top' : 'origin-bottom'
+            )}
+            placement=${this.alignment === 'left' ? `${this.placement}-start` : `${this.placement}-end`}
+            flip
+            shift
             auto-size="vertical"
             auto-size-padding="10"
             exportparts="popup:popup__content,"
@@ -2047,9 +2083,8 @@ export default class SdDatepicker extends SolidElement implements SolidFormContr
                 name="calendar"
                 @click=${this.show}
               ></sd-icon>
-
-              ${this.renderCalendar()}
             </div>
+            ${this.renderCalendar()}
           </sd-popup>
         </div>
         <slot
diff --git a/packages/docs/src/stories/components/datepicker.stories.ts b/packages/docs/src/stories/components/datepicker.stories.ts
index 9ad79d0e97..250e1d46d6 100644
--- a/packages/docs/src/stories/components/datepicker.stories.ts
+++ b/packages/docs/src/stories/components/datepicker.stories.ts
@@ -23,7 +23,7 @@ export default {
 
 export const Default = {
   render: (args: any) => {
-    return html`<div class="h-[500px] w-[370px] h-[500px]">${generateTemplate({ args })}</div>`;
+    return html`<div class="h-[500px] w-[370px]">${generateTemplate({ args })}</div>`;
   }
 };
 
diff --git a/packages/docs/src/stories/components/datepicker.test.stories.ts b/packages/docs/src/stories/components/datepicker.test.stories.ts
index b8e1e0d037..d837fb66cc 100644
--- a/packages/docs/src/stories/components/datepicker.test.stories.ts
+++ b/packages/docs/src/stories/components/datepicker.test.stories.ts
@@ -161,6 +161,15 @@ export const MinAndMax = {
   }
 };
 
+export const Placement = {
+  name: 'Placement',
+  render: () => {
+    return html`<div class="w-[400px] mt-[400px]">
+      <sd-datepicker label="Label" size="lg" placement="top" value="2025-12-10"></sd-datepicker>
+    </div>`;
+  }
+};
+
 export const Mouseless = {
   name: 'Mouseless',
   render: (args: any) => {
@@ -195,6 +204,7 @@ export const Combination = generateScreenshotStory([
   DisabledWeekends,
   DisabledDates,
   MinAndMax,
+  Placement,
   Mouseless,
   LocaleAware
 ]);