diff --git a/chartLib/src/main/kotlin/info/appdev/charting/renderer/AxisRenderer.kt b/chartLib/src/main/kotlin/info/appdev/charting/renderer/AxisRenderer.kt
index 2f0dfecbc..4c552d521 100644
--- a/chartLib/src/main/kotlin/info/appdev/charting/renderer/AxisRenderer.kt
+++ b/chartLib/src/main/kotlin/info/appdev/charting/renderer/AxisRenderer.kt
@@ -121,14 +121,14 @@ abstract class AxisRenderer(
 
         // Find out how much spacing (in y value space) between axis values
         val rawInterval = range / labelCount
-        var interval = rawInterval.roundToNextSignificant().toDouble()
+        var interval = rawInterval.roundToNextSignificant()
 
         // If granularity is enabled, then do not allow the interval to go below specified granularity.
         // This is used to avoid repeated values when rounding values for display.
         if (axis.isGranularityEnabled) interval = if (interval < axis.granularity) axis.granularity.toDouble() else interval
 
         // Normalize interval
-        val intervalMagnitude = 10.0.pow(log10(interval).toInt().toDouble()).roundToNextSignificant().toDouble()
+        val intervalMagnitude = 10.0.pow(log10(interval).toInt().toDouble()).roundToNextSignificant()
         val intervalSigDigit = (interval / intervalMagnitude).toInt()
         if (intervalSigDigit > 5) {
             // Use one order of magnitude higher, to avoid intervals like 0.9 or 90
diff --git a/chartLib/src/main/kotlin/info/appdev/charting/renderer/YAxisRendererRadarChart.kt b/chartLib/src/main/kotlin/info/appdev/charting/renderer/YAxisRendererRadarChart.kt
index ec983b54a..07489bc20 100644
--- a/chartLib/src/main/kotlin/info/appdev/charting/renderer/YAxisRendererRadarChart.kt
+++ b/chartLib/src/main/kotlin/info/appdev/charting/renderer/YAxisRendererRadarChart.kt
@@ -37,14 +37,14 @@ class YAxisRendererRadarChart(
 
         // Find out how much spacing (in y value space) between axis values
         val rawInterval = range / labelCount
-        var interval = rawInterval.roundToNextSignificant().toDouble()
+        var interval = rawInterval.roundToNextSignificant()
 
         // If granularity is enabled, then do not allow the interval to go below specified granularity.
         // This is used to avoid repeated values when rounding values for display.
         if (axis.isGranularityEnabled) interval = if (interval < axis.granularity) axis.granularity.toDouble() else interval
 
         // Normalize interval
-        val intervalMagnitude = 10.0.pow(log10(interval).toInt().toDouble()).roundToNextSignificant().toDouble()
+        val intervalMagnitude = 10.0.pow(log10(interval).toInt().toDouble()).roundToNextSignificant()
         val intervalSigDigit = (interval / intervalMagnitude).toInt()
         if (intervalSigDigit > 5) {
             // Use one order of magnitude higher, to avoid intervals like 0.9 or 90
diff --git a/chartLib/src/main/kotlin/info/appdev/charting/utils/NumberUtils.kt b/chartLib/src/main/kotlin/info/appdev/charting/utils/NumberUtils.kt
index 3eeaaa1ae..93dedbffc 100644
--- a/chartLib/src/main/kotlin/info/appdev/charting/utils/NumberUtils.kt
+++ b/chartLib/src/main/kotlin/info/appdev/charting/utils/NumberUtils.kt
@@ -16,22 +16,22 @@ fun Float.getDecimals(): Int {
         return 0
     }
 
-    return ceil(-log10(i.toDouble())).toInt() + 2
+    return ceil(-log10(i)).toInt() + 2
 }
 
 /**
  * rounds the given number to the next significant number
  */
-fun Double.roundToNextSignificant(): Float {
+fun Double.roundToNextSignificant(): Double {
     if (this.isInfinite() ||
         this.isNaN() || this == 0.0
     ) {
-        return 0f
+        return 0.0
     }
 
-    val d = ceil(log10(if (this < 0) -this else this).toFloat().toDouble()).toFloat()
+    val d = ceil(log10(if (this < 0) -this else this).toFloat().toDouble())
     val pw = 1 - d.toInt()
-    val magnitude = 10.0.pow(pw.toDouble()).toFloat()
+    val magnitude = 10.0.pow(pw.toDouble())
     val shifted = (this * magnitude).roundToInt()
     return shifted / magnitude
 }