diff --git a/lib/keymanagers/Key.js b/lib/keymanagers/Key.js
index 1f17e78..9a7f90b 100644
--- a/lib/keymanagers/Key.js
+++ b/lib/keymanagers/Key.js
@@ -106,9 +106,7 @@ module.exports = class Key {
 		const key = this.keyIsPublic ? this.publicKey : this.privateKey;
 		const eKey = Buffer.from(key.e.toByteArray());
 
-		return to === 'hex'
-			? eKey.toString('hex')
-			: eKey;
+		return to === 'hex' ? eKey.toString('hex') : eKey;
 	}
 
 	d() {
@@ -128,7 +126,10 @@ module.exports = class Key {
 
 	// eslint-disable-next-line class-methods-use-this
 	size() {
-		return 2048;
+		const keyN = this.n('hex');
+		const bn = new BigInteger(keyN, 16);
+
+		return bn.bitLength();
 	}
 
 	toPem() {