diff --git a/ui/public/locales/en.json b/ui/public/locales/en.json
index 99bf2cf7aef9..5974fce4d976 100644
--- a/ui/public/locales/en.json
+++ b/ui/public/locales/en.json
@@ -3667,6 +3667,7 @@
 "message.error.mtu.below.min": "MTU is below the minimum supported value of %x",
 "message.error.mtu.public.max.exceed": "The value entered exceeds the maximum allowed public MTU for this Zone, your value will be automatically lowered to match it.",
 "message.error.mtu.private.max.exceed": "The value entered exceeds the maximum allowed private MTU for this Zone, your value will be automatically lowered to match it.",
+"message.error.memory.gib.step": "Please enter memory in multiples of 0.25 GiB (256 MiB), or switch to MiB.",
 "message.error.name": "Please enter name.",
 "message.error.netmask": "Please enter Netmask.",
 "message.error.network.offering": "Please select Network offering.",
@@ -3861,6 +3862,7 @@
 "message.lock.user.success": "Successfully locked User \"{user}\"",
 "message.login.failed": "Login Failed",
 "message.maintenance.initiated": "Maintenance has been initiated. This Management Server will not accept new jobs",
+"message.memory.gib.not.supported": "GiB unit is not available because memory limits or values must be multiples of 256 MiB (0.25 GiB). Please use MiB.",
 "message.migrate.instance.host.auto.assign": "Host for the Instance will be automatically chosen based on the suitability within the same Cluster",
 "message.migrate.instance.to.host": "Please confirm that you want to migrate this Instance to another host. When migration is between hosts of different Clusters volume(s) of the Instance may get migrated to suitable storage pools.",
 "message.migrate.instance.to.ps": "Please confirm that you want to migrate this Instance to another primary storage.",
diff --git a/ui/src/views/compute/wizard/ComputeSelection.vue b/ui/src/views/compute/wizard/ComputeSelection.vue
index 9cf36153f5cd..cab072db223f 100644
--- a/ui/src/views/compute/wizard/ComputeSelection.vue
+++ b/ui/src/views/compute/wizard/ComputeSelection.vue
@@ -57,23 +57,42 @@
         </a-col>
         <a-col :md="colContraned" :lg="colContraned" v-if="isCustomized">
           <a-form-item
-            :label="$t('label.memory.mb')"
+            :label="$t('label.memory')"
             :validate-status="errors.memory.status"
             :help="errors.memory.message">
             <a-row :gutter="12">
-              <a-col :md="10" :lg="10" v-show="isConstrained && maxMemory && !isNaN(maxMemory)">
+              <a-col :md="14" :lg="14" v-show="isConstrained && maxMemory && !isNaN(maxMemory) && maxMemory < 1000000000">
                 <a-slider
-                  :min="minMemory"
-                  :max="maxMemory"
-                  v-model:value="memoryInputValue"
+                  :min="minMemoryInUnit"
+                  :max="maxMemoryInUnit"
+                  :step="memoryStep"
+                  v-model:value="memoryDisplayValue"
                   @change="($event) => updateComputeMemory($event)"
                 />
               </a-col>
-              <a-col :md="4" :lg="4">
-                <a-input-number
-                  v-model:value="memoryInputValue"
-                  @change="($event) => updateComputeMemory($event)"
-                />
+              <a-col :md="isConstrained && maxMemory && !isNaN(maxMemory) && maxMemory < 1000000000 ? 10 : 24" :lg="isConstrained && maxMemory && !isNaN(maxMemory) && maxMemory < 1000000000 ? 10 : 24">
+                <a-input-group compact style="display: flex">
+                  <a-tooltip :title="memoryTooltipText" placement="topLeft" style="flex: 1; display: flex">
+                    <a-input-number
+                      style="width: 100%; min-width: 60px"
+                      :min="isConstrained ? minMemoryInUnit : 0"
+                      :max="isConstrained && maxMemoryInUnit > 0 ? maxMemoryInUnit : undefined"
+                      :step="memoryStep"
+                      :precision="memoryUnit === 'GiB' ? 2 : 0"
+                      v-model:value="memoryDisplayValue"
+                      @change="($event) => updateComputeMemory($event)"
+                    />
+                  </a-tooltip>
+                  <a-select
+                    v-model:value="memoryUnit"
+                    style="width: 75px"
+                    @change="handleUnitChange">
+                    <a-select-option value="GiB" :title="!isGiBAllowed ? $t('message.memory.gib.not.supported') : undefined">
+                      GiB
+                    </a-select-option>
+                    <a-select-option value="MiB">MiB</a-select-option>
+                  </a-select>
+                </a-input-group>
               </a-col>
             </a-row>
           </a-form-item>
@@ -96,6 +115,8 @@
 </template>
 
 <script>
+import { message } from 'ant-design-vue'
+
 export default {
   name: 'ComputeSelection',
   props: {
@@ -165,6 +186,8 @@ export default {
       cpuNumberInputValue: 0,
       cpuSpeedInputValue: 0,
       memoryInputValue: 0,
+      memoryDisplayValue: 0,
+      memoryUnit: 'GiB',
       errors: {
         cpu: {
           status: '',
@@ -192,6 +215,47 @@ export default {
       }
 
       return 8
+    },
+    isGiBAllowed () {
+      if (this.preFillContent && this.preFillContent.memory && (this.preFillContent.memory % 256 !== 0)) {
+        return false
+      }
+      if (this.initialMemoryValue > 0 && (this.initialMemoryValue % 256 !== 0)) {
+        return false
+      }
+      if (!this.isConstrained) {
+        return true
+      }
+      const isMinValid = !this.minMemory || (this.minMemory >= 256 && this.minMemory % 256 === 0)
+      const isMaxValid = !this.maxMemory || this.maxMemory >= Number.MAX_SAFE_INTEGER || (this.maxMemory >= 256 && this.maxMemory % 256 === 0)
+      return Boolean(isMinValid && isMaxValid)
+    },
+    minMemoryInUnit () {
+      if (!this.minMemory) return 0
+      if (this.memoryUnit === 'GiB') {
+        return this.minMemory / 1024
+      }
+      return this.minMemory
+    },
+    maxMemoryInUnit () {
+      if (!this.maxMemory || this.maxMemory >= Number.MAX_SAFE_INTEGER) return 0
+      if (this.memoryUnit === 'GiB') {
+        return this.maxMemory / 1024
+      }
+      return this.maxMemory
+    },
+    memoryStep () {
+      if (this.memoryUnit === 'GiB') {
+        return 0.25
+      }
+      return 1
+    },
+    memoryTooltipText () {
+      if (!this.memoryInputValue || this.memoryInputValue <= 0) return ''
+      if (this.memoryUnit === 'GiB') {
+        return `${this.memoryDisplayValue} GiB = ${this.memoryInputValue} MiB`
+      }
+      return ''
     }
   },
   watch: {
@@ -209,13 +273,28 @@ export default {
   methods: {
     fillValue () {
       this.cpuNumberInputValue = this.initialCpuValue > 0 ? this.initialCpuValue : this.minCpu
-      this.memoryInputValue = this.initialMemoryValue > 0 ? this.initialMemoryValue : this.minMemory
+      const rawMemory = (this.preFillContent && this.preFillContent.memory)
+        ? this.preFillContent.memory
+        : (this.initialMemoryValue > 0 ? this.initialMemoryValue : this.minMemory)
+
+      // Default to GiB only if GiB is allowed and rawMemory is 0 or multiple of 256 MiB
+      const shouldUseGiB = this.isGiBAllowed && (rawMemory === 0 || (rawMemory >= 256 && rawMemory % 256 === 0))
+      this.memoryUnit = shouldUseGiB ? 'GiB' : 'MiB'
+
+      if (rawMemory > 0) {
+        this.memoryInputValue = rawMemory
+        this.memoryDisplayValue = shouldUseGiB ? (rawMemory / 1024) : rawMemory
+      } else {
+        this.memoryInputValue = undefined
+        this.memoryDisplayValue = undefined
+      }
+
       this.cpuSpeedInputValue = this.cpuSpeed
 
       if (!this.preFillContent) {
         this.updateComputeCpuNumber(this.cpuNumberInputValue)
         this.updateComputeCpuSpeed(this.cpuSpeedInputValue)
-        this.updateComputeMemory(this.memoryInputValue)
+        this.$emit('update-compute-memory', this.memoryInputDecorator, this.memoryInputValue)
         return
       }
       if (this.preFillContent.cpunumber) {
@@ -224,16 +303,50 @@ export default {
       if (this.preFillContent.cpuspeed) {
         this.cpuSpeedInputValue = this.preFillContent.cpuspeed
       }
-      if (this.preFillContent.memory) {
-        this.memoryInputValue = this.preFillContent.memory
-      }
+
       this.updateComputeCpuNumber(this.preFillContent.cpunumber || this.cpuNumberInputValue)
       this.updateComputeCpuSpeed(this.preFillContent.cpuspeed || this.cpuSpeedInputValue)
-      this.updateComputeMemory(this.preFillContent.memory || this.memoryInputValue)
+      // Emit exact prefilled MiB without any conversion on load
+      this.$emit('update-compute-memory', this.memoryInputDecorator, this.memoryInputValue)
+    },
+    handleUnitChange (newUnit) {
+      if (newUnit === 'GiB') {
+        const currentMiB = this.memoryUnit === 'MiB' ? this.memoryDisplayValue : this.memoryInputValue
+        if (!this.isGiBAllowed || (currentMiB > 0 && currentMiB % 256 !== 0)) {
+          this.memoryUnit = 'MiB'
+          this.$nextTick(() => {
+            this.memoryUnit = 'MiB'
+          })
+          message.warning(
+            this.$t('message.memory.gib.not.supported') ||
+            'GiB unit is not available because memory limits or values must be multiples of 256 MiB (0.25 GiB). Please use MiB.'
+          )
+          return
+        }
+      }
+
+      if (newUnit === 'MiB') {
+        this.memoryDisplayValue = (this.memoryInputValue !== undefined && this.memoryInputValue !== null)
+          ? this.memoryInputValue
+          : (this.memoryDisplayValue ? Math.round(this.memoryDisplayValue * 1024) : undefined)
+      } else {
+        this.memoryDisplayValue = (this.memoryInputValue !== undefined && this.memoryInputValue !== null)
+          ? this.memoryInputValue / 1024
+          : (this.memoryDisplayValue ? this.memoryDisplayValue : undefined)
+      }
+      if (this.isConstrained) {
+        if (this.memoryDisplayValue < this.minMemoryInUnit) {
+          this.memoryDisplayValue = this.minMemoryInUnit
+        } else if (this.maxMemoryInUnit > 0 && this.memoryDisplayValue > this.maxMemoryInUnit) {
+          this.memoryDisplayValue = this.maxMemoryInUnit
+        }
+      }
+      this.updateComputeMemory(this.memoryDisplayValue)
     },
     updateComputeCpuNumber (value) {
-      if (!value) this.cpuNumberInputValue = 0
+      this.cpuNumberInputValue = value
       if (!this.validateInput('cpu', value)) {
+        this.$emit('update-compute-cpunumber', this.cpuNumberInputDecorator, undefined)
         return
       }
       this.$emit('update-compute-cpunumber', this.cpuNumberInputDecorator, value)
@@ -241,23 +354,44 @@ export default {
     updateComputeCpuSpeed (value) {
       this.$emit('update-compute-cpuspeed', this.cpuSpeedInputDecorator, value)
     },
-    updateComputeMemory (value) {
-      if (!value) this.memoryInputValue = 0
-      if (!this.validateInput('memory', value)) {
+    updateComputeMemory (displayValue) {
+      this.memoryDisplayValue = displayValue
+      if (!this.validateInput('memory', displayValue)) {
+        this.memoryInputValue = undefined
+        this.$emit('update-compute-memory', this.memoryInputDecorator, undefined)
         return
       }
-      this.$emit('update-compute-memory', this.memoryInputDecorator, value)
+      let memoryInMiB
+      if (this.memoryUnit === 'GiB') {
+        memoryInMiB = Math.round(displayValue * 1024)
+      } else {
+        memoryInMiB = Math.round(displayValue)
+      }
+
+      this.memoryInputValue = memoryInMiB
+      this.$emit('update-compute-memory', this.memoryInputDecorator, memoryInMiB)
     },
     validateInput (input, value) {
       this.errors[input].status = ''
       this.errors[input].message = ''
 
-      if (value === null || value === undefined || value.length === 0) {
+      if (value === null || value === undefined || value.length === 0 || value === '' || value === 0) {
         this.errors[input].status = 'error'
         this.errors[input].message = this.$t('message.error.required.input')
         return false
       }
 
+      if (input === 'memory') {
+        if (this.memoryUnit === 'GiB') {
+          const isStepMultiple = Math.abs(value * 4 - Math.round(value * 4)) < 0.001
+          if (!isStepMultiple) {
+            this.errors.memory.status = 'error'
+            this.errors.memory.message = this.$t('message.error.memory.gib.step') || 'Please enter memory in multiples of 0.25 GiB (256 MiB), or switch to MiB.'
+            return false
+          }
+        }
+      }
+
       if (!this.isConstrained) {
         return true
       }
@@ -271,21 +405,25 @@ export default {
           max = this.maxCpu
           break
         case 'memory':
-          min = this.minMemory
-          max = this.maxMemory
+          min = this.minMemoryInUnit
+          max = this.maxMemoryInUnit
           break
       }
 
       if (!this.checkValidRange(value, min, max)) {
         this.errors[input].status = 'error'
-        this.errors[input].message = `${this.$t('message.please.enter.value')} ${this.$t('label.from')} ${min} ${this.$t('label.to')} ${max})`
+        this.errors[input].message = `${this.$t('message.please.enter.value')} ${this.$t('label.from')} ${min} ${this.$t('label.to')} ${max}`
         return false
       }
 
       return true
     },
     checkValidRange (value, min, max) {
-      if (value < min || value > max) {
+      const epsilon = 0.001
+      if (min !== undefined && min !== null && value < (min - epsilon)) {
+        return false
+      }
+      if (max !== undefined && max !== null && max > 0 && max < Number.MAX_SAFE_INTEGER && value > (max + epsilon)) {
         return false
       }