diff --git a/src/command/stamp/buy.ts b/src/command/stamp/buy.ts
index 7e998236..5431ba9d 100644
--- a/src/command/stamp/buy.ts
+++ b/src/command/stamp/buy.ts
@@ -61,10 +61,19 @@ export class Buy extends StampCommand implements LeafCommand {
 
     const estimatedCost = Utils.getStampCostInBzz(this.depth, Number(this.amount))
     const estimatedCapacity = new Storage(Utils.getStampMaximumCapacityBytes(this.depth))
+    const estimatedEffectiveVolume = new Storage(Utils.getStampEffectiveBytes(this.depth))
     const estimatedTtl = Utils.getStampTtlSeconds(Number(this.amount))
 
     this.console.log(createKeyValue('Estimated cost', `${estimatedCost.toFixed(3)} BZZ`))
     this.console.log(createKeyValue('Estimated capacity', estimatedCapacity.toString()))
+    this.console.log(
+      createKeyValue(
+        'Estimated effective volume',
+        estimatedEffectiveVolume.getBytes() === 0
+          ? "It's likely to be smaller than estimated capacity"
+          : estimatedEffectiveVolume.toString(),
+      ),
+    )
     this.console.log(createKeyValue('Estimated TTL', secondsToDhms(estimatedTtl)))
     this.console.log(createKeyValue('Type', this.immutable ? 'Immutable' : 'Mutable'))
 
diff --git a/test/prompt/stamp-prompt.spec.ts b/test/prompt/stamp-prompt.spec.ts
index bdc61bee..82231815 100644
--- a/test/prompt/stamp-prompt.spec.ts
+++ b/test/prompt/stamp-prompt.spec.ts
@@ -8,7 +8,8 @@ describeCommand('Postage stamp price estimation prompt', ({ consoleMessages }) =
     await invokeTestCli(['stamp', 'buy', '--depth', '24', '--amount', '596046400'])
     expect(consoleMessages[0]).toBe('Estimated cost: 1.000 BZZ')
     expect(consoleMessages[1]).toBe('Estimated capacity: 64.00 GB')
-    expect(consoleMessages[2]).toBe('Estimated TTL: 1 day 10 hours 29 minutes 36 seconds')
+    expect(consoleMessages[2]).toBe('Estimated effective volume: 41.17 GB')
+    expect(consoleMessages[3]).toBe('Estimated TTL: 1 day 10 hours 29 minutes 36 seconds')
     expect(inquirer.prompt).toHaveBeenCalledWith({
       message: 'Confirm the purchase',
       name: 'value',