diff --git a/derive_macro/src/lib.rs b/derive_macro/src/lib.rs
index 5a8bc98..410171d 100644
--- a/derive_macro/src/lib.rs
+++ b/derive_macro/src/lib.rs
@@ -1,5 +1,4 @@
 mod merge;
-mod unit;
 
 use proc_macro::TokenStream;
 use syn::{DeriveInput, parse_macro_input};
@@ -9,9 +8,3 @@ pub fn merge_derive(input: TokenStream) -> TokenStream {
     let input = parse_macro_input!(input as DeriveInput);
     merge::impl_merge_derive(input)
 }
-
-#[proc_macro_derive(UnitConversions, attributes(units, error))]
-pub fn unit_derive(input: TokenStream) -> TokenStream {
-    let input = parse_macro_input!(input as DeriveInput);
-    unit::impl_unit_conversions(input)
-}
diff --git a/derive_macro/src/merge.rs b/derive_macro/src/merge.rs
index bd682f3..83c1fc1 100644
--- a/derive_macro/src/merge.rs
+++ b/derive_macro/src/merge.rs
@@ -55,4 +55,3 @@ pub fn impl_merge_derive(input: DeriveInput) -> TokenStream {
 
     expanded.into()
 }
-
diff --git a/src/app/utils/filesize.rs b/src/app/utils/filesize.rs
index b83a451..ee51399 100644
--- a/src/app/utils/filesize.rs
+++ b/src/app/utils/filesize.rs
@@ -1,9 +1,7 @@
-use super::unit::{Unit, UnitDisplay};
-use derive_macro::UnitConversions;
+use super::unit::{Unit, UnitDisplay, UnitError};
 use std::fmt::Display;
 
-#[derive(Debug, PartialEq, Eq, PartialOrd, Ord, Default, UnitConversions)]
-#[error(UnitError)]
+#[derive(Debug, PartialEq, Eq, PartialOrd, Ord, Default)]
 pub struct FileSize(Unit);
 
 impl FileSize {
@@ -18,3 +16,17 @@ impl Display for FileSize {
         write!(f, "{}", UnitDisplay::new(&self.0, UNITS))
     }
 }
+
+impl From<u64> for FileSize {
+    fn from(value: u64) -> Self {
+        Self(Unit::from(value))
+    }
+}
+
+impl TryFrom<i64> for FileSize {
+    type Error = UnitError;
+
+    fn try_from(value: i64) -> Result<Self, Self::Error> {
+        Ok(Self(Unit::try_from(value)?))
+    }
+}
diff --git a/src/app/utils/netspeed.rs b/src/app/utils/netspeed.rs
index fe99b2e..5355f85 100644
--- a/src/app/utils/netspeed.rs
+++ b/src/app/utils/netspeed.rs
@@ -1,9 +1,7 @@
-use super::unit::{Unit, UnitDisplay};
-use derive_macro::UnitConversions;
+use super::unit::{Unit, UnitDisplay, UnitError};
 use std::fmt::Display;
 
-#[derive(Debug, PartialEq, Eq, PartialOrd, Ord, Default, UnitConversions)]
-#[error(UnitError)]
+#[derive(Debug, PartialEq, Eq, PartialOrd, Ord, Default)]
 pub struct NetSpeed(Unit);
 
 impl NetSpeed {
@@ -18,3 +16,17 @@ impl Display for NetSpeed {
         write!(f, "{}", UnitDisplay::new(&self.0, UNITS))
     }
 }
+
+impl From<u64> for NetSpeed {
+    fn from(value: u64) -> Self {
+        Self(Unit::from(value))
+    }
+}
+
+impl TryFrom<i64> for NetSpeed {
+    type Error = UnitError;
+
+    fn try_from(value: i64) -> Result<Self, Self::Error> {
+        Ok(Self(Unit::try_from(value)?))
+    }
+}
diff --git a/src/app/utils/unit.rs b/src/app/utils/unit.rs
index 1fa9e82..2704429 100644
--- a/src/app/utils/unit.rs
+++ b/src/app/utils/unit.rs
@@ -1,4 +1,3 @@
-use derive_macro::UnitConversions;
 use std::fmt::Display;
 use thiserror::Error;
 
@@ -12,8 +11,7 @@ pub enum UnitError {
     InvalidValue { reason: String },
 }
 
-#[derive(Debug, PartialEq, Eq, PartialOrd, Ord, Default, UnitConversions)]
-#[error(UnitError)]
+#[derive(Debug, PartialEq, Eq, PartialOrd, Ord, Default)]
 pub struct Unit(u64);
 
 impl Unit {
@@ -58,3 +56,20 @@ impl<'a> Display for UnitDisplay<'a> {
         write!(f, "{:.2} {}", size, self.units[unit_index])
     }
 }
+
+impl From<u64> for Unit {
+    fn from(value: u64) -> Self {
+        Self(value)
+    }
+}
+
+impl TryFrom<i64> for Unit {
+    type Error = UnitError;
+
+    fn try_from(value: i64) -> Result<Self, Self::Error> {
+        if value < 0 {
+            return Err(UnitError::NegativeValue { value });
+        }
+        Ok(Self(value as u64))
+    }
+}