diff --git a/server/resources/mailResource.ts b/server/resources/mailResource.ts
index 29568e9..7210b95 100644
--- a/server/resources/mailResource.ts
+++ b/server/resources/mailResource.ts
@@ -3,11 +3,12 @@ import ErrorTypes from "../utils/errorTypes";
 import * as MailService from "../services/mailService";
 import * as Resources from "../utils/resources";
 import { handleJSONWithData, RequestData } from "../utils/resources";
-import { normalizeString, parseInteger } from "../shared/utils/strings";
+import { normalizeString } from "../shared/utils/strings";
 import { forConstraint } from "../shared/validation/validator";
 import type { Request, Response } from "express";
 import { isString, Mail, MailId } from "../types";
 import { HttpHeader } from "../shared/utils/http";
+import { parseToInteger } from "../shared/utils/numbers";
 
 const isValidId = forConstraint(CONSTRAINTS.id, false);
 
@@ -22,7 +23,7 @@ async function withValidMailId(data: RequestData): Promise<MailId> {
         throw { data: "Invalid mail id.", type: ErrorTypes.badRequest };
     }
 
-    return parseInteger(id) as MailId;
+    return parseToInteger(id) as MailId;
 }
 
 export const get = handleJSONWithData(async (data) => {
diff --git a/server/services/monitoringService.ts b/server/services/monitoringService.ts
index 57c915a..0736402 100644
--- a/server/services/monitoringService.ts
+++ b/server/services/monitoringService.ts
@@ -11,7 +11,8 @@ import * as MailService from "../services/mailService";
 import * as NodeService from "../services/nodeService";
 import * as Resources from "../utils/resources";
 import type { RestParams } from "../utils/resources";
-import { normalizeMac, parseInteger } from "../shared/utils/strings";
+import { normalizeMac } from "../shared/utils/strings";
+import { parseToInteger } from "../shared/utils/numbers";
 import { monitoringDisableUrl } from "../utils/urlBuilder";
 import CONSTRAINTS from "../shared/validation/constraints";
 import { forConstraint } from "../shared/validation/validator";
@@ -525,7 +526,7 @@ async function sendOfflineMails(
     startTime: UnixTimestampSeconds,
     mailType: MailType
 ): Promise<void> {
-    const mailNumber = parseInteger(mailType.split("-")[2]);
+    const mailNumber = parseToInteger(mailType.split("-")[2]);
     await sendMonitoringMailsBatched(
         "offline " + mailNumber,
         mailType,
diff --git a/server/shared/types/primitives.ts b/server/shared/types/primitives.ts
index d9a6acf..fcc48a7 100644
--- a/server/shared/types/primitives.ts
+++ b/server/shared/types/primitives.ts
@@ -24,6 +24,15 @@ export function isInteger(arg: unknown): arg is number {
     return isNumber(arg) && Number.isInteger(arg);
 }
 
+/**
+ * Type guard checking the given value is a floating point `number`.
+ *
+ * @param arg - Value to check.
+ */
+export function isFloat(arg: unknown): arg is number {
+    return isNumber(arg) && Number.isFinite(arg);
+}
+
 // =====================================================================================================================
 // Strings
 // =====================================================================================================================
diff --git a/server/shared/utils/numbers.ts b/server/shared/utils/numbers.ts
new file mode 100644
index 0000000..0955ef0
--- /dev/null
+++ b/server/shared/utils/numbers.ts
@@ -0,0 +1,163 @@
+/**
+ * Utility functions for numbers.
+ */
+import { isFloat, isInteger } from "../types";
+
+// TODO: Write tests!
+
+/**
+ * Normalizes the given `string` before parsing as a `number` by:
+ *
+ * * Removing whitespace from beginning and end of the `string`.
+ * * Removing one `+` at the beginning of the number.
+ *
+ * @param arg - String to normalize.
+ * @returns The normalized string.
+ */
+function normalizeStringToParse(arg: string): string {
+    const str = (arg as string).trim();
+    return str.startsWith("+") ? str.slice(1) : str;
+}
+
+/**
+ * Parses the given value and converts it into an integer.
+ *
+ * For a `string` to be considered a valid representation of an integer `number` it has to satisfy the
+ * following criteria:
+ *
+ * * The integer must be base 10.
+ * * The `string` starts with an optional `+` or `-` sign followed by one or more digits.
+ * * The first digit must not be `0`.
+ * * Surrounding whitespaces will be ignored.
+ *
+ * @param arg - Value to parse.
+ * @returns The parsed integer `number`.
+ * @throws {@link SyntaxError} - If the given value does not represent a valid integer.
+ * @throws {@link RangeError} - If the given value is a non-integer number.
+ * @throws {@link TypeError} - If the given value is neither an integer `number` nor a `string`.
+ */
+export function parseToInteger(arg: unknown): number;
+
+/**
+ * Parses the given value and converts it into an integer.
+ *
+ * For a `string` to be considered a valid representation of an integer `number` it has to satisfy the
+ * following criteria:
+ *
+ * * The integer base matches the given radix.
+ * * The `string` starts with an optional `+` or `-` sign followed by one or more digits.
+ * * The first digit must not be `0`.
+ * * Surrounding whitespaces will be ignored.
+ *
+ * @param arg - Value to parse.
+ * @param radix - Integer base to parse against. Must be an integer in range `2 <= radix <= 36`.
+ * @returns The parsed integer `number`.
+ * @throws {@link SyntaxError} - If the given value does not represent a valid integer.
+ * @throws {@link RangeError} - If the given value is a non-integer number or the given radix is out of range.
+ * @throws {@link TypeError} - If the given value is neither an integer `number` nor a `string`.
+ */
+export function parseToInteger(arg: unknown, radix: number): number;
+
+/**
+ * Parses the given value and converts it into an integer.
+ *
+ * For a `string` to be considered a valid representation of an integer `number` it has to satisfy the
+ * following criteria:
+ *
+ * * The integer base matches the given or default radix.
+ * * The `string` starts with an optional `+` or `-` sign followed by one or more digits.
+ * * The first digit must not be `0`.
+ * * Surrounding whitespaces will be ignored.
+ *
+ * @param arg - Value to parse.
+ * @param radix - Optional: Integer base to parse against. Must be an integer in range `2 <= radix <= 36`.
+ * @returns The parsed integer `number`.
+ * @throws {@link SyntaxError} - If the given value does not represent a valid integer.
+ * @throws {@link RangeError} - If the given value is a non-integer number or the given radix is out of range.
+ * @throws {@link TypeError} - If the given value is neither an integer `number` nor a `string`.
+ */
+export function parseToInteger(arg: unknown, radix?: number): number {
+    if (!radix) {
+        radix = 10;
+    }
+    if (radix < 2 || radix > 36 || isNaN(radix)) {
+        throw new RangeError(`Radix out of range: ${radix}`);
+    }
+
+    if (isInteger(arg)) {
+        return arg;
+    }
+
+    switch (typeof arg) {
+        case "number":
+            throw new RangeError(`Not an integer: ${arg}`);
+        case "string": {
+            const str = normalizeStringToParse(arg as string);
+            const num = parseInt(str, radix);
+            if (isNaN(num)) {
+                throw new SyntaxError(
+                    `Not a valid number (radix: ${radix}): ${str}`
+                );
+            }
+            if (num.toString(radix).toLowerCase() !== str.toLowerCase()) {
+                throw new SyntaxError(
+                    `Parsed integer does not match given string (radix: ${radix}): ${str}`
+                );
+            }
+            return num;
+        }
+        default:
+            throw new TypeError(
+                `Cannot parse number (radix: ${radix}): ${arg} of type ${typeof arg}`
+            );
+    }
+}
+
+/**
+ * Parses the given value and converts it into a finite floating point `number`.
+ *
+ * For a `string` to be considered a valid representation of a floating point `number` it has to satisfy the
+ * following criteria:
+ *
+ * * The number is base 10.
+ * * The `string` starts with an optional `+` or `-` sign followed by one or more digits and at most one decimal point.
+ * * It starts with at most one leading `0` (after the optional sign).
+ * * Surrounding whitespaces will be ignored.
+ *
+ * @param arg - Value to parse.
+ * @returns The parsed floating point `number`.
+ * @throws {@link SyntaxError} - If the given value does not represent a finite floating point number.
+ * @throws {@link RangeError} - If the given value is number that is either not finite or is `NaN`.
+ * @throws {@link TypeError} - If the given value is neither a floating point `number` nor a `string`.
+ */
+export function parseToFloat(arg: unknown): number {
+    if (isFloat(arg)) {
+        return arg;
+    }
+    switch (typeof arg) {
+        case "number":
+            throw new Error(`Not a finite number: ${arg}`);
+        case "string": {
+            let str = (arg as string).trim();
+            const num = parseFloat(str);
+            if (isNaN(num)) {
+                throw new Error(`Not a valid number: ${str}`);
+            }
+
+            if (Number.isInteger(num)) {
+                str = str.replace(/\.0+$/, "");
+            }
+
+            if (num.toString(10) !== str) {
+                throw new Error(
+                    `Parsed float does not match given string: ${num.toString(
+                        10
+                    )} !== ${str}`
+                );
+            }
+            return num;
+        }
+        default:
+            throw new Error(`Cannot parse number: ${arg}`);
+    }
+}
diff --git a/server/shared/utils/strings.ts b/server/shared/utils/strings.ts
index 0068e8a..95df1ab 100644
--- a/server/shared/utils/strings.ts
+++ b/server/shared/utils/strings.ts
@@ -1,7 +1,7 @@
 /**
  * Utility functions all around strings.
  */
-import { isInteger, type MAC } from "../types";
+import type { MAC } from "../types";
 
 /**
  * Trims the given `string` and replaces multiple whitespaces by one space each.
@@ -39,31 +39,3 @@ export function normalizeMac(mac: MAC): MAC {
 
     return macParts.join(":") as MAC;
 }
-
-/**
- * Parses the given `string` and converts it into an integer.
- *
- * For a `string` to be considered a valid representation of an integer `number` it has to satisfy the
- * following criteria:
- *
- * * The integer is base `10`.
- * * The `string` starts with an optional `+` or `-` sign followed by one or more digits.
- * * The first digit must not be `0`.
- * * The `string` does not contain any other characters.
- *
- * @param str - `string` to parse.
- * @returns The parsed integer `number`.
- * @throws {@link SyntaxError} - If the given `string` does not represent a valid integer.
- */
-export function parseInteger(str: string): number {
-    const parsed = parseInt(str, 10);
-    const original = str.startsWith("+") ? str.slice(1) : str;
-
-    if (isInteger(parsed) && parsed.toString() === original) {
-        return parsed;
-    } else {
-        throw new SyntaxError(
-            `String does not represent a valid integer: "${str}"`
-        );
-    }
-}
diff --git a/server/shared/validation/validator.ts b/server/shared/validation/validator.ts
index 02940cd..983a49b 100644
--- a/server/shared/validation/validator.ts
+++ b/server/shared/validation/validator.ts
@@ -1,4 +1,4 @@
-import { parseInteger } from "../utils/strings";
+import { parseToInteger } from "../utils/numbers";
 import {
     isBoolean,
     isNumber,
@@ -67,7 +67,7 @@ function isValidBoolean(value: unknown): boolean {
 
 function isValidNumber(constraint: Constraint, value: unknown): boolean {
     if (isString(value)) {
-        value = parseInteger(value);
+        value = parseToInteger(value);
     }
 
     if (!isNumber(value)) {