diff --git a/journal/src/helpers.rs b/journal/src/helpers.rs
index 92944d3..e202e2d 100644
--- a/journal/src/helpers.rs
+++ b/journal/src/helpers.rs
@@ -1,6 +1,8 @@
-use crate::types::{CustomUnit, Estimation, IngestionDose, StandardIngestionDose};
+use crate::types::{
+	CustomUnitDose, CustomUnitIngestionDose, Estimation, IngestionDose, StandardIngestionDose,
+};
 
-fn add_standard_deviation(
+pub fn add_standard_deviation(
 	expectation_x: f64,
 	standard_deviation_x: f64,
 	expectation_y: f64,
@@ -9,64 +11,52 @@ fn add_standard_deviation(
 	let sum_x = standard_deviation_x.powi(2) + expectation_x.powi(2);
 	let sum_y = standard_deviation_y.powi(2) + expectation_y.powi(2);
 
-	let expectations = expectation_x.powi(2) + expectation_y.powi(2);
+	let expectations = expectation_x.powi(2) * expectation_y.powi(2);
 
 	let product_variance = (sum_x * sum_y) - expectations;
-
+	println!("{} {} {} {}", sum_x, sum_y, expectations, product_variance);
 	if product_variance > 0.0000001 {
 		Some((product_variance.sqrt() * 100.0).round() / 100.0)
 	} else {
-		println!(
-			"{} {} {} {}",
-			expectation_x, standard_deviation_x, expectation_y, standard_deviation_y,
-		);
-
 		None
 	}
 }
 
-pub fn canonical_dose(dose: &IngestionDose, custom_unit: Option<&CustomUnit>) -> IngestionDose {
-	if let IngestionDose::Custom(dose) = dose {
-		let custom_unit = custom_unit.expect("custom unit not provided when dose is type custom");
-		let custom_unit_dose = &custom_unit.dose;
+pub fn calulate_custom_unit_ingestion_dose(
+	dose: &CustomUnitIngestionDose,
+	custom_unit_dose: &CustomUnitDose,
+) -> IngestionDose {
+	let estimation = match (&dose.estimation, &custom_unit_dose.estimation) {
+		(
+			&Estimation::StandardDeviation(dose_standard_deviation),
+			&Estimation::StandardDeviation(custom_unit_standard_deviation),
+		) => {
+			let result = add_standard_deviation(
+				dose.dose,
+				dose_standard_deviation,
+				custom_unit_dose.dose,
+				custom_unit_standard_deviation,
+			);
+			if let Some(result) = result {
+				Estimation::StandardDeviation(result)
+			} else {
+				Estimation::Estimate
+			}
+		}
+		(&Estimation::StandardDeviation(dose_standard_deviation), _) => {
+			Estimation::StandardDeviation(dose_standard_deviation)
+		}
+		(_, &Estimation::StandardDeviation(custom_unit_standard_deviation)) => {
+			Estimation::StandardDeviation(custom_unit_standard_deviation)
+		}
+		(Estimation::Precise, Estimation::Precise) => Estimation::Precise,
+		_ => Estimation::Estimate,
+	};
 
-		let estimation = match (&dose.estimation, &custom_unit_dose.estimation) {
-			(
-				&Estimation::StandardDeviation(dose_standard_deviation),
-				&Estimation::StandardDeviation(custom_unit_standard_deviation),
-			) => {
-				let result = add_standard_deviation(
-					dose.dose,
-					dose_standard_deviation,
-					custom_unit_dose.dose,
-					custom_unit_standard_deviation,
-				);
-				if let Some(result) = result {
-					Estimation::StandardDeviation(result)
-				} else {
-					Estimation::Estimate
-				}
-			}
-			(&Estimation::StandardDeviation(dose_standard_deviation), _) => {
-				Estimation::StandardDeviation(dose_standard_deviation)
-			}
-			(_, &Estimation::StandardDeviation(custom_unit_standard_deviation)) => {
-				Estimation::StandardDeviation(custom_unit_standard_deviation)
-			}
-			(Estimation::Precise, Estimation::Precise) => Estimation::Precise,
-			_ => Estimation::Estimate,
-		};
-
-		IngestionDose::Standard(StandardIngestionDose {
-			dose: dose.dose * custom_unit_dose.dose,
-			unit: custom_unit.original_unit.clone(),
-			estimation,
-		})
-	} else {
-		dose.clone()
-	}
-}
-
-pub fn canonical_unit(dose: &IngestionDose, custom_unit: Option<&CustomUnit>) -> String {
-	canonical_dose(dose, custom_unit).unit()
+	IngestionDose::Standard(StandardIngestionDose {
+		dose: dose.dose * custom_unit_dose.dose,
+		unit: custom_unit_dose.original_unit.clone(),
+		contains_unknown: false,
+		estimation,
+	})
 }
diff --git a/journal/src/lib.rs b/journal/src/lib.rs
index 96c1cb9..52af0f9 100644
--- a/journal/src/lib.rs
+++ b/journal/src/lib.rs
@@ -1,2 +1,2 @@
-pub mod types;
 pub mod helpers;
+pub mod types;
diff --git a/journal/src/types.rs b/journal/src/types.rs
index bf2b947..e684d25 100644
--- a/journal/src/types.rs
+++ b/journal/src/types.rs
@@ -1,11 +1,12 @@
 use chrono::{DateTime, TimeZone, Utc};
 use std::collections::HashMap;
 use std::fmt::{Debug, Display};
+use std::ops::Add;
 use std::str::FromStr;
 
 pub type AdministrationRoute = psychonaut_journal_types::AdministrationRoute;
 
-#[derive(PartialEq, Debug, Clone)]
+#[derive(PartialEq, Debug, Copy, Clone)]
 pub enum Estimation {
 	Precise,
 	Estimate,
@@ -24,6 +25,23 @@ impl Estimation {
 	}
 }
 
+impl Add for Estimation {
+	type Output = Self;
+
+	fn add(self, rhs: Self) -> Self::Output {
+		match (self, rhs) {
+			(Estimation::StandardDeviation(x), Estimation::StandardDeviation(y)) => {
+				Estimation::StandardDeviation(x + y)
+			}
+			(Estimation::StandardDeviation(x), _) | (_, Estimation::StandardDeviation(x)) => {
+				Estimation::StandardDeviation(x)
+			}
+			(Estimation::Estimate, _) | (_, Estimation::Estimate) => Estimation::Estimate,
+			(Estimation::Precise, Estimation::Precise) => Estimation::Precise,
+		}
+	}
+}
+
 #[derive(Debug, Clone)]
 pub struct UnknownIngestionDose {
 	pub unit: String,
@@ -33,52 +51,60 @@ pub struct UnknownIngestionDose {
 pub struct StandardIngestionDose {
 	pub dose: f64,
 	pub unit: String,
+	pub contains_unknown: bool,
 	pub estimation: Estimation,
 }
 
-impl StandardIngestionDose {
-	pub fn is_estimate(&self) -> bool {
-		self.estimation.is_estimate()
+impl Add<UnknownIngestionDose> for StandardIngestionDose {
+	type Output = Self;
+
+	fn add(self, _: UnknownIngestionDose) -> Self::Output {
+		StandardIngestionDose {
+			dose: self.dose,
+			unit: self.unit,
+			contains_unknown: true,
+			estimation: self.estimation,
+		}
+	}
+}
+
+impl Add for StandardIngestionDose {
+	type Output = Self;
+
+	fn add(self, rhs: Self) -> Self::Output {
+		StandardIngestionDose {
+			dose: self.dose + rhs.dose,
+			unit: self.unit,
+			contains_unknown: self.contains_unknown || rhs.contains_unknown,
+			estimation: self.estimation + rhs.estimation,
+		}
+	}
+}
+
+impl From<CustomUnitDose> for StandardIngestionDose {
+	fn from(value: CustomUnitDose) -> StandardIngestionDose {
+		StandardIngestionDose {
+			dose: value.dose,
+			unit: value.original_unit,
+			contains_unknown: false,
+			estimation: value.estimation,
+		}
 	}
 }
 
 #[derive(Debug, Clone)]
-pub struct CustomIngestionDose {
+pub struct CustomUnitIngestionDose {
 	pub dose: f64,
 	pub unit: String,
-	pub original_unit: String,
 	pub estimation: Estimation,
 	pub custom_unit_id: i64,
 }
 
-impl CustomIngestionDose {
-	pub fn is_estimate(&self) -> bool {
-		self.estimation.is_estimate()
-	}
-}
-
 #[derive(Debug, Clone)]
 pub enum IngestionDose {
 	Unknown(UnknownIngestionDose),
 	Standard(StandardIngestionDose),
-	Custom(CustomIngestionDose),
-}
-
-impl IngestionDose {
-	pub fn is_estimate(&self) -> bool {
-		match self {
-			IngestionDose::Unknown(_) => false,
-			IngestionDose::Standard(dose) => dose.is_estimate(),
-			IngestionDose::Custom(dose) => dose.is_estimate(),
-		}
-	}
-	pub fn unit(&self) -> String {
-		match self {
-			IngestionDose::Unknown(dose) => dose.unit.clone(),
-			IngestionDose::Standard(dose) => dose.unit.clone(),
-			IngestionDose::Custom(dose) => dose.unit.clone(),
-		}
-	}
+	CustomUnit(CustomUnitIngestionDose),
 }
 
 #[derive(PartialEq, Debug, Clone)]
@@ -136,6 +162,14 @@ pub struct Experience {
 	pub ingestions: Vec<Ingestion>,
 }
 
+#[derive(Debug, Clone)]
+pub struct CustomUnitDose {
+	pub dose: f64,
+	pub unit: String,
+	pub original_unit: String,
+	pub estimation: Estimation,
+}
+
 #[derive(Debug, Clone)]
 pub struct CustomUnit {
 	pub id: i64,
@@ -143,8 +177,7 @@ pub struct CustomUnit {
 	pub substance_name: String,
 
 	pub administration_route: AdministrationRoute,
-	pub dose: StandardIngestionDose,
-	pub original_unit: String,
+	pub dose: CustomUnitDose,
 
 	pub creation_time: DateTime<Utc>,
 	pub is_archived: bool,
@@ -163,9 +196,9 @@ impl Journal {
 		self.custom_units.get(&id).cloned()
 	}
 
-	pub fn maybe_get_custom_unit_for(&self, ingestion: &Ingestion) -> Option<CustomUnit> {
+	pub fn maybe_custom_unit(&self, ingestion: &Ingestion) -> Option<CustomUnit> {
 		match &ingestion.dose {
-			IngestionDose::Custom(dose) => self.get_custom_unit(dose.custom_unit_id),
+			IngestionDose::CustomUnit(dose) => self.get_custom_unit(dose.custom_unit_id),
 			_ => None,
 		}
 	}
@@ -196,9 +229,10 @@ impl Journal {
 					substance_name: custom_unit.substance_name,
 
 					administration_route: custom_unit.administration_route,
-					dose: StandardIngestionDose {
+					dose: CustomUnitDose {
 						dose: custom_unit.dose,
 						unit: custom_unit.unit,
+						original_unit: custom_unit.original_unit,
 						estimation: if custom_unit.is_estimate {
 							if let Some(standard_deviation) =
 								custom_unit.estimate_standard_deviation
@@ -212,8 +246,6 @@ impl Journal {
 						},
 					},
 
-					original_unit: custom_unit.original_unit,
-
 					creation_time: from_unix_millis(custom_unit.creation_time),
 					is_archived: custom_unit.is_archived,
 				},
@@ -245,15 +277,14 @@ impl Journal {
 					dose: {
 						if let Some(dose) = ingestion.dose {
 							if let Some(custom_unit_id) = ingestion.custom_unit_id {
-								IngestionDose::Custom(CustomIngestionDose {
+								let custom_unit = journal
+									.custom_units
+									.get(&custom_unit_id)
+									.expect("custom unit not found");
+
+								IngestionDose::CustomUnit(CustomUnitIngestionDose {
 									dose,
-									unit: ingestion.unit.clone(),
-									original_unit: journal
-										.custom_units
-										.get(&custom_unit_id)
-										.expect("custom unit not found")
-										.original_unit
-										.clone(),
+									unit: custom_unit.dose.unit.clone(),
 									estimation,
 									custom_unit_id,
 								})
@@ -262,6 +293,7 @@ impl Journal {
 									dose,
 									unit: ingestion.unit,
 									estimation,
+									contains_unknown: false,
 								})
 							}
 						} else {
diff --git a/journal_cli/src/commands/mod.rs b/journal_cli/src/commands/mod.rs
index 899875e..d27ed5e 100644
--- a/journal_cli/src/commands/mod.rs
+++ b/journal_cli/src/commands/mod.rs
@@ -1 +1 @@
-pub mod print_experience;
\ No newline at end of file
+pub mod print_experience;
diff --git a/journal_cli/src/commands/print_experience.rs b/journal_cli/src/commands/print_experience.rs
index ddc853c..ee4ca4e 100644
--- a/journal_cli/src/commands/print_experience.rs
+++ b/journal_cli/src/commands/print_experience.rs
@@ -46,6 +46,8 @@ pub fn print_experience(
 		.first_experience_by_title(&args.experience_title)
 		.expect("could not find experience");
 
+	//println!("{:#?}", &experience);
+
 	println!("{}", format_experience_title(&experience));
 
 	let substance_filter = args.substance_filter.clone();
diff --git a/journal_cli/src/display.rs b/journal_cli/src/display.rs
index 23f785e..44f5f46 100644
--- a/journal_cli/src/display.rs
+++ b/journal_cli/src/display.rs
@@ -21,12 +21,14 @@ pub fn print_ingestion_log(
 			}
 		}
 
-		let custom_unit = journal.maybe_get_custom_unit_for(ingestion);
+		let custom_unit = journal.maybe_custom_unit(ingestion);
+
+		//println!("{:#?} {:#?}", &ingestion, &custom_unit);
 
 		println!(
 			"{}|{}|{}|{}|{}",
 			ingestion.substance_name,
-			format_ingestion_dose(&ingestion.dose, custom_unit.as_ref()),
+			format_ingestion_dose(&ingestion.dose, custom_unit.as_ref().map(|f| &f.dose)),
 			format_ingestion_roa(ingestion, custom_unit.as_ref()),
 			ingestion.consumer,
 			format_ingestion_time(ingestion)
diff --git a/journal_cli/src/formatting.rs b/journal_cli/src/formatting.rs
index 3f1d430..1ca0c02 100644
--- a/journal_cli/src/formatting.rs
+++ b/journal_cli/src/formatting.rs
@@ -1,63 +1,60 @@
 use journal::{
-	helpers::canonical_dose,
-	types::{CustomUnit, Experience, Ingestion, IngestionDose, StandardIngestionDose},
+	helpers::calulate_custom_unit_ingestion_dose,
+	types::{
+		CustomUnit, CustomUnitDose, Estimation, Experience, Ingestion, IngestionDose,
+		StandardIngestionDose,
+	},
 };
 
 pub fn format_experience_title(experience: &Experience) -> String {
 	format!("{}: {}", experience.title, experience.creation_time)
 }
 
-pub fn format_ingestion_dose(dose: &IngestionDose, custom_unit: Option<&CustomUnit>) -> String {
+pub fn format_ingestion_dose(
+	dose: &IngestionDose,
+	custom_unit_dose: Option<&CustomUnitDose>,
+) -> String {
 	match dose {
 		IngestionDose::Unknown(dose) => format!("Unknown {}", dose.unit),
 		IngestionDose::Standard(dose) => {
-			let is_estimate = match dose.estimation {
-				journal::types::Estimation::Precise => false,
-				journal::types::Estimation::Estimate
-				| journal::types::Estimation::StandardDeviation(_) => true,
-			};
+			let is_estimate = dose.estimation.is_estimate();
 
 			let estimate = if is_estimate { "~" } else { "" };
-			let standard_deviation =
-				if let journal::types::Estimation::StandardDeviation(standard_deviation) =
-					dose.estimation
-				{
+			let standard_deviation = {
+				if let Estimation::StandardDeviation(standard_deviation) = dose.estimation {
 					format!("±{}", (standard_deviation * 100.0).round() / 100.0)
 				} else {
 					"".to_string()
-				};
+				}
+			};
 			let dose_value = (dose.dose * 100.0).round() / 100.0;
 			let unit = dose.unit.clone();
 
 			format!("{estimate}{dose_value}{standard_deviation} {unit}")
 		}
-		IngestionDose::Custom(dose) => {
-			let custom_unit: &CustomUnit = custom_unit.expect("custom unit required for dose type");
+		IngestionDose::CustomUnit(dose) => {
+			let custom_unit_dose = custom_unit_dose.expect("custom unit dose required");
 
-			let canonical_dose =
-				canonical_dose(&IngestionDose::Custom(dose.clone()), Some(custom_unit));
+			let ingestion_dose = calulate_custom_unit_ingestion_dose(dose, custom_unit_dose);
 
-			let canonical_dose = format_ingestion_dose(&canonical_dose, None);
+			let ingestion_dose = format_ingestion_dose(&ingestion_dose, None);
 
-			let custom_unit_dose_per = format_ingestion_dose(
-				&IngestionDose::Standard(StandardIngestionDose {
-					dose: custom_unit.dose.dose,
-					unit: custom_unit.original_unit.clone(),
-					estimation: custom_unit.dose.estimation.clone(),
-				}),
+			let dose_per_unit = format_ingestion_dose(
+				&IngestionDose::Standard(StandardIngestionDose::from(custom_unit_dose.clone())),
 				None,
 			);
 
 			let custom_unit_dose = format_ingestion_dose(
 				&IngestionDose::Standard(StandardIngestionDose {
 					dose: dose.dose,
-					unit: custom_unit.dose.unit.clone(),
-					estimation: custom_unit.dose.estimation.clone(),
+					unit: custom_unit_dose.unit.clone(),
+					contains_unknown: false,
+					estimation: dose.estimation,
 				}),
 				None,
 			);
 
-			format!("{canonical_dose} ({custom_unit_dose_per} * {custom_unit_dose})")
+			format!("{ingestion_dose} ({dose_per_unit} * {custom_unit_dose})")
 		}
 	}
 }
diff --git a/journal_cli/src/utils.rs b/journal_cli/src/utils.rs
index 2182337..f06aa38 100644
--- a/journal_cli/src/utils.rs
+++ b/journal_cli/src/utils.rs
@@ -11,4 +11,3 @@ pub fn load_journal(filename: &String) -> Result<Journal, Box<dyn std::error::Er
 
 	Ok(journal)
 }
-