diff --git a/Ratios/CalculatorViewController.swift b/Ratios/CalculatorViewController.swift
index a7b42a5..1368cca 100644
--- a/Ratios/CalculatorViewController.swift
+++ b/Ratios/CalculatorViewController.swift
@@ -148,7 +148,7 @@ class CalculatorViewController: UIViewController {
         self.stackViewWidthConstraint?.isActive = true
     }
     
-    func updateBackgroundColor(_ ratio: Int, duration: TimeInterval = 0.15) {
+    func updateBackgroundColor(_ ratio: Double, duration: TimeInterval = 0.15) {
         UIView.animate(withDuration: duration, delay: 0, options: [.curveEaseInOut, .allowUserInteraction], animations: {
             let newBackgroundColor = BrewStrengthColor.colorFor(ratio)
             self.view.backgroundColor = newBackgroundColor
@@ -157,7 +157,7 @@ class CalculatorViewController: UIViewController {
     }
 
     @objc func handleFieldValueChange(_ sender: AnyObject) {
-        let ratio = Int(self.ratioInputView.textField.text ?? "16") ?? 16
+        let ratio = Double(self.ratioInputView.textField.text ?? "16") ?? 16
         var total = Double(self.totalInputView.textField.text ?? "0") ?? 0
         var water = Double(self.waterInputView.textField.text ?? "0") ?? 0
         var grounds = Double(self.groundsInputView.textField.text ?? "0") ?? 0
diff --git a/Ratios/Helpers/Calculator.swift b/Ratios/Helpers/Calculator.swift
index fbdbd51..0ff137d 100644
--- a/Ratios/Helpers/Calculator.swift
+++ b/Ratios/Helpers/Calculator.swift
@@ -10,21 +10,21 @@ import Foundation
 
 struct Calculator {
 
-    static func calculateGrounds(brew: Double, ratio: Int) -> Double {
+    static func calculateGrounds(brew: Double, ratio: Double) -> Double {
         guard ratio > 2 else {
             return 0
         }
         return brew / Double(ratio - 2)
     }
 
-    static func calculateGrounds(water: Double, ratio: Int) -> Double {
+    static func calculateGrounds(water: Double, ratio: Double) -> Double {
         guard ratio > 0 else {
             return 0
         }
         return water / Double(ratio)
     }
 
-    static func calculateWater(grounds: Double, ratio: Int) -> Double {
+    static func calculateWater(grounds: Double, ratio: Double) -> Double {
         return grounds * Double(ratio)
     }
 
diff --git a/Ratios/Helpers/PersistenceStore.swift b/Ratios/Helpers/PersistenceStore.swift
index e8e5a33..1de4786 100644
--- a/Ratios/Helpers/PersistenceStore.swift
+++ b/Ratios/Helpers/PersistenceStore.swift
@@ -9,8 +9,8 @@
 import Foundation
 
 protocol PersistenceStore {
-    func save(grounds: Double, ratio: Int)
-    func getValues() -> (grounds: Double, ratio: Int)
+    func save(grounds: Double, ratio: Double)
+    func getValues() -> (grounds: Double, ratio: Double)
 }
 
 extension UserDefaults: PersistenceStore {
@@ -18,14 +18,14 @@ extension UserDefaults: PersistenceStore {
     private static let ratiosPersistenceGroundsKey = "co.brushedtype.ratios.grounds"
     private static let ratiosPersistenceRatioKey = "co.brushedtype.ratios.ratio"
 
-    func save(grounds: Double, ratio: Int) {
+    func save(grounds: Double, ratio: Double) {
         self.set(grounds, forKey: UserDefaults.ratiosPersistenceGroundsKey)
         self.set(ratio, forKey: UserDefaults.ratiosPersistenceRatioKey)
     }
 
-    func getValues() -> (grounds: Double, ratio: Int) {
+    func getValues() -> (grounds: Double, ratio: Double) {
         let grounds = self.double(forKey: UserDefaults.ratiosPersistenceGroundsKey)
-        let ratio = self.integer(forKey: UserDefaults.ratiosPersistenceRatioKey)
+        let ratio = self.double(forKey: UserDefaults.ratiosPersistenceRatioKey)
 
         let groundsOrFallback = grounds > 0 ? grounds : 12
         let ratioOrFallback = ratio > 0 ? ratio : 16