diff --git a/changelog/unreleased/issue-20965.toml b/changelog/unreleased/issue-20965.toml
new file mode 100644
index 000000000000..945c311ad85e
--- /dev/null
+++ b/changelog/unreleased/issue-20965.toml
@@ -0,0 +1,5 @@
+type = "a"
+message = "Add unit handling to a single number widget"
+
+issues = ["20965"]
+pulls = ["21339"]
diff --git a/graylog2-web-interface/src/views/components/visualizations/number/NumberVisualization.tsx b/graylog2-web-interface/src/views/components/visualizations/number/NumberVisualization.tsx
index 1c1559a5357f..aaee11fd9cfa 100644
--- a/graylog2-web-interface/src/views/components/visualizations/number/NumberVisualization.tsx
+++ b/graylog2-web-interface/src/views/components/visualizations/number/NumberVisualization.tsx
@@ -14,7 +14,7 @@
  * along with this program. If not, see
  * <http://www.mongodb.com/licensing/server-side-public-license>.
  */
-import React, { useContext, useEffect, useRef } from 'react';
+import React, { useContext, useEffect, useRef, useMemo } from 'react';
 import styled, { css } from 'styled-components';
 
 import type { Rows } from 'views/logic/searchtypes/pivot/PivotHandler';
@@ -27,9 +27,13 @@ import NumberVisualizationConfig from 'views/logic/aggregationbuilder/visualizat
 import type { VisualizationComponentProps } from 'views/components/aggregationbuilder/AggregationBuilder';
 import { makeVisualization, retrieveChartData } from 'views/components/aggregationbuilder/AggregationBuilder';
 import ElementDimensions from 'components/common/ElementDimensions';
+import useWidgetUnits from 'views/components/visualizations/hooks/useWidgetUnits';
+import useFeature from 'hooks/useFeature';
+import { UNIT_FEATURE_FLAG } from 'views/components/visualizations/Constants';
+import { parseSeries } from 'views/logic/aggregationbuilder/Series';
 
-import Trend from './Trend';
 import AutoFontSizer from './AutoFontSizer';
+import Trend from './Trend';
 
 const Container = styled.div<{ $height: number }>(({ $height }) => css`
   height: ${$height}px;
@@ -89,6 +93,8 @@ const _extractFirstSeriesName = (config) => {
 
 const NumberVisualization = ({ config, fields, data, height: heightProp }: VisualizationComponentProps) => {
   const targetRef = useRef();
+  const unitFeatureEnabled = useFeature(UNIT_FEATURE_FLAG);
+  const widgetUnits = useWidgetUnits(config);
   const onRenderComplete = useContext(RenderCompletionCallback);
   const visualizationConfig = (config.visualizationConfig as NumberVisualizationConfig) ?? NumberVisualizationConfig.create();
 
@@ -99,6 +105,13 @@ const NumberVisualization = ({ config, fields, data, height: heightProp }: Visua
   const trendRows = data.trend;
   const { value } = _extractValueAndField(chartRows);
   const { value: previousValue } = _extractValueAndField(trendRows || []);
+  const unit = useMemo(() => {
+    if (!unitFeatureEnabled) return undefined;
+
+    const fieldNameKey = parseSeries(field).field;
+
+    return widgetUnits.getFieldUnit(fieldNameKey);
+  }, [field, unitFeatureEnabled, widgetUnits]);
 
   if (!field || (value !== 0 && !value)) {
     return <>N/A</>;
@@ -115,7 +128,8 @@ const NumberVisualization = ({ config, fields, data, height: heightProp }: Visua
               <Value field={field}
                      type={fieldTypeFor(field, fields)}
                      value={value}
-                     render={DecoratedValue} />
+                     render={DecoratedValue}
+                     unit={unit} />
             </CustomHighlighting>
           </AutoFontSizer>
         )}
@@ -127,7 +141,8 @@ const NumberVisualization = ({ config, fields, data, height: heightProp }: Visua
               <Trend ref={targetRef}
                      current={value}
                      previous={previousValue}
-                     trendPreference={visualizationConfig.trendPreference} />
+                     trendPreference={visualizationConfig.trendPreference}
+                     unit={unit} />
             </AutoFontSizer>
           )}
         </TrendBox>
diff --git a/graylog2-web-interface/src/views/components/visualizations/number/Trend.tsx b/graylog2-web-interface/src/views/components/visualizations/number/Trend.tsx
index cc8682f03189..c632d99b32f4 100644
--- a/graylog2-web-interface/src/views/components/visualizations/number/Trend.tsx
+++ b/graylog2-web-interface/src/views/components/visualizations/number/Trend.tsx
@@ -21,6 +21,13 @@ import numeral from 'numeral';
 
 import Icon from 'components/common/Icon';
 import type { TrendPreference } from 'views/logic/aggregationbuilder/visualizations/NumberVisualizationConfig';
+import type FieldUnit from 'views/logic/aggregationbuilder/FieldUnit';
+import {
+  getPrettifiedValue,
+  convertValueToUnit,
+} from 'views/components/visualizations/utils/unitConverters';
+import formatValueWithUnitLabel from 'views/components/visualizations/utils/formatValueWithUnitLabel';
+import getUnitTextLabel from 'views/components/visualizations/utils/getUnitTextLabel';
 
 type TrendDirection = 'good' | 'bad' | 'neutral';
 
@@ -28,6 +35,7 @@ type Props = {
   current: number,
   previous: number | undefined | null,
   trendPreference: TrendPreference,
+  unit?: FieldUnit,
 };
 
 const background = (theme: DefaultTheme, trend: TrendDirection = 'neutral') => ({
@@ -98,19 +106,53 @@ const diff = (current: number | undefined, previous: number | undefined): [numbe
   return [NaN, NaN];
 };
 
-const Trend = React.forwardRef<HTMLSpanElement, Props>(({ current, previous, trendPreference }: Props, ref) => {
+const getTrendConvertedValues = (current: number, previous: number, fieldUNit: FieldUnit): {
+  previousConverted: number | string,
+  differenceConverted: number,
+  differencePercent: number,
+  unitAbbrevString: string,
+} => {
   const [difference, differencePercent] = diff(current, previous);
 
-  const backgroundTrend = _trendDirection(difference, trendPreference);
-  const trendIcon = _trendIcon(difference);
+  if (!fieldUNit?.isDefined) {
+    return ({
+      previousConverted: previous,
+      differenceConverted: difference,
+      differencePercent,
+      unitAbbrevString: '',
+    });
+  }
+
+  const originalParams = { unitType: fieldUNit?.unitType, abbrev: fieldUNit?.abbrev };
+  const { unit: currentPrettyUnit } = getPrettifiedValue(current, originalParams);
+  const currentPrettyParams = { unitType: currentPrettyUnit?.unitType, abbrev: currentPrettyUnit?.abbrev };
+  const { value: prettyDiff } = convertValueToUnit(difference, originalParams, currentPrettyParams);
+  const { value: previousPretty } = convertValueToUnit(previous, originalParams, currentPrettyParams);
+
+  return ({
+    previousConverted: `${formatValueWithUnitLabel(previousPretty, currentPrettyUnit.abbrev)} (${previous})`,
+    unitAbbrevString: ` ${getUnitTextLabel(currentPrettyUnit.abbrev)}`,
+    differenceConverted: prettyDiff,
+    differencePercent,
+  });
+};
+
+const Trend = React.forwardRef<HTMLSpanElement, Props>(({ current, previous, trendPreference, unit = undefined }: Props, ref) => {
+  const { differenceConverted, differencePercent, unitAbbrevString, previousConverted } = getTrendConvertedValues(current, previous, unit);
+
+  const backgroundTrend = _trendDirection(differenceConverted, trendPreference);
+  const trendIcon = _trendIcon(differenceConverted);
 
-  const absoluteDifference = Number.isFinite(difference) ? numeral(difference).format('+0,0[.]0[000]') : '--';
+  const absoluteDifference = Number.isFinite(differenceConverted) ? `${numeral(differenceConverted).format('+0,0[.]0[000]')}${unitAbbrevString}` : '--';
   const relativeDifference = Number.isFinite(differencePercent) ? numeral(differencePercent).format('+0[.]0[0]%') : '--';
 
   return (
     <Background trend={backgroundTrend} data-testid="trend-background">
       <TextContainer trend={backgroundTrend} ref={ref}>
-        <StyledIcon name={trendIcon} trend={backgroundTrend} data-testid="trend-icon" /> <span data-testid="trend-value" title={`Previous value: ${previous}`}>{absoluteDifference} / {relativeDifference}</span>
+        <StyledIcon name={trendIcon} trend={backgroundTrend} data-testid="trend-icon" />{' '}
+        <span data-testid="trend-value" title={`Previous value: ${previousConverted}`}>
+          {absoluteDifference} / {relativeDifference}
+        </span>
       </TextContainer>
     </Background>
   );
diff --git a/graylog2-web-interface/src/views/components/visualizations/utils/unitConverters.ts b/graylog2-web-interface/src/views/components/visualizations/utils/unitConverters.ts
index a8caa7ea4087..2772c2437a37 100644
--- a/graylog2-web-interface/src/views/components/visualizations/utils/unitConverters.ts
+++ b/graylog2-web-interface/src/views/components/visualizations/utils/unitConverters.ts
@@ -130,20 +130,28 @@ const _convertValueToUnit = (units: FieldUnitTypes, value: number, fromParams: C
 export const _getPrettifiedValue = (units: FieldUnitTypes, initValue: number | string, params: ConversionParams): ConvertedResult => {
   const currentUnit = units?.[params?.unitType] ?? null;
 
-  const value = initValue === null ? null : toNumber(initValue);
-  if (!(value && currentUnit)) return ({ value, unit: currentUnit ? currentUnit.find(({ abbrev }) => abbrev === params.abbrev) : null });
+  const _value = initValue === null ? null : toNumber(initValue);
+  if (!(_value && currentUnit)) return ({ value: _value, unit: currentUnit ? currentUnit.find(({ abbrev }) => abbrev === params.abbrev) : null });
 
-  const allConvertedValues = Object.values(currentUnit).map((unit: Unit) => _convertValueToUnit(units, value, params, { abbrev: unit.abbrev, unitType: unit.unitType }));
+  const sign = Math.sign(_value);
+  const absolutValue = Math.abs(_value);
+
+  const allConvertedValues = Object.values(currentUnit).map((unit: Unit) => _convertValueToUnit(units, absolutValue, params, { abbrev: unit.abbrev, unitType: unit.unitType }));
 
   const filtratedValues = allConvertedValues.filter(({ value: val, unit }) => val >= 1 && unit.useInPrettier);
 
+  let result: ConvertedResult;
+
   if (filtratedValues.length > 0) {
-    return minBy(filtratedValues, ({ value: val }) => val);
+    result = minBy(filtratedValues, ({ value: val }) => val);
+  } else {
+    const filtratedValuesLower = allConvertedValues.filter(({ value: val, unit }) => val < 1 && unit.useInPrettier);
+    result = maxBy(filtratedValuesLower, ({ value: val }) => val);
   }
 
-  const filtratedValuesLower = allConvertedValues.filter(({ value: val, unit }) => val < 1 && unit.useInPrettier);
+  result.value *= sign;
 
-  return maxBy(filtratedValuesLower, ({ value: val }) => val);
+  return result;
 };
 
 export type ConvertValueToUnit = (value: number, fromParams: ConversionParams, toParams: ConversionParams) => ConvertedResult