diff --git a/CHANGELOG.md b/CHANGELOG.md
index e20c84a..6fe1a61 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -37,6 +37,7 @@ All notable changes to eww will be listed here, starting at changes since versio
 - Add `log` function calls to simplexpr (By: topongo)
 - Add `:lines` and `:wrap-mode` properties to label widget (By: vaporii)
 - Add `value-pos` to scale widget (By: ipsvn)
+- Add `floor` and `ceil` function calls to simplexpr (By: wsbankenstein)
 
 ## [0.6.0] (21.04.2024)
 
diff --git a/Cargo.lock b/Cargo.lock
index 7c03984..dbe73fc 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -1,6 +1,6 @@
 # This file is automatically @generated by Cargo.
 # It is not intended for manual editing.
-version = 3
+version = 4
 
 [[package]]
 name = "addr2line"
diff --git a/crates/simplexpr/src/eval.rs b/crates/simplexpr/src/eval.rs
index 8ee0d84..fc56c85 100644
--- a/crates/simplexpr/src/eval.rs
+++ b/crates/simplexpr/src/eval.rs
@@ -329,6 +329,20 @@ fn call_expr_function(name: &str, args: Vec<DynVal>) -> Result<DynVal, EvalError
             }
             _ => Err(EvalError::WrongArgCount(name.to_string())),
         },
+        "floor" => match args.as_slice() {
+            [num] => {
+                let num = num.as_f64()?;
+                Ok(DynVal::from(num.floor()))
+            }
+            _ => Err(EvalError::WrongArgCount(name.to_string())),
+        },
+        "ceil" => match args.as_slice() {
+            [num] => {
+                let num = num.as_f64()?;
+                Ok(DynVal::from(num.ceil()))
+            }
+            _ => Err(EvalError::WrongArgCount(name.to_string())),
+        },
         "min" => match args.as_slice() {
             [a, b] => {
                 let a = a.as_f64()?;
diff --git a/docs/src/expression_language.md b/docs/src/expression_language.md
index 106776a..f9c0757 100644
--- a/docs/src/expression_language.md
+++ b/docs/src/expression_language.md
@@ -41,6 +41,8 @@ Supported currently are the following features:
     - for this, the object/array value needs to refer to a variable that contains a valid json string.
 - some function calls:
     - `round(number, decimal_digits)`: Round a number to the given amount of decimals
+    - `floor(number)`: Round a number up to the nearest integer
+    - `ceil(number)`: Round a number down to the nearest integer
     - `sin(number)`, `cos(number)`, `tan(number)`, `cot(number)`: Calculate the trigonometric value of a given number in **radians**
     - `min(a, b)`, `max(a, b)`: Get the smaller or bigger number out of two given numbers
     - `powi(num, n)`, `powf(num, n)`: Raise number `num` to power `n`. `powi` expects `n` to be of type `i32`