diff --git a/README.md b/README.md
index f4d0d24b2dd7..e61c326d0214 100644
--- a/README.md
+++ b/README.md
@@ -197,6 +197,7 @@ ARGS:
 
 * seth
     * [x] `--from-ascii`
+    * [x] `--to-hex`
     * [x] `--to-checksum-address`
     * [x] `--to-bytes32`
     * [x] `block`
diff --git a/dapptools/src/seth.rs b/dapptools/src/seth.rs
index 846771f0bd9a..63e88a6e11d3 100644
--- a/dapptools/src/seth.rs
+++ b/dapptools/src/seth.rs
@@ -18,6 +18,9 @@ pub enum Subcommands {
     #[structopt(name = "--from-ascii")]
     #[structopt(about = "convert text data into hexdata")]
     FromAscii { text: String },
+    #[structopt(name = "--to-hex")]
+    #[structopt(about = "convert a decimal number into hex")]
+    ToHex { decimal: Option<u128> },
     #[structopt(name = "--to-checksum-address")]
     #[structopt(about = "convert an address to a checksummed format (EIP-55)")]
     ToCheckSumAddress { address: Address },
@@ -131,6 +134,9 @@ async fn main() -> eyre::Result<()> {
         Subcommands::FromAscii { text } => {
             println!("{}", SimpleSeth::from_ascii(&text));
         }
+        Subcommands::ToHex { decimal } => {
+            println!("{}", SimpleSeth::to_hex(unwrap_or_stdin(decimal)?));
+        }
         Subcommands::ToCheckSumAddress { address } => {
             println!("{}", SimpleSeth::to_checksum_address(&address)?);
         }
diff --git a/seth/src/lib.rs b/seth/src/lib.rs
index a4e77a7141ca..fed3ffd42399 100644
--- a/seth/src/lib.rs
+++ b/seth/src/lib.rs
@@ -211,6 +211,17 @@ impl SimpleSeth {
         let s: String = s.as_bytes().to_hex();
         format!("0x{}", s)
     }
+    /// Converts decimal input to hex
+    ///
+    /// ```
+    /// use seth::SimpleSeth as Seth;
+    ///
+    /// assert_eq!(Seth::to_hex(424242), "0x67932");
+    /// assert_eq!(Seth::to_hex(1234), "0x4d2");
+    /// ```
+    pub fn to_hex(u: u128) -> String {
+        format!("{:#x}", u)
+    }
 
     /// Converts an Ethereum address to its checksum format
     /// according to [EIP-55](https://github.com/ethereum/EIPs/blob/master/EIPS/eip-55.md)