diff --git a/workers.go b/workers.go
index dc36433..c017407 100644
--- a/workers.go
+++ b/workers.go
@@ -32,6 +32,7 @@ type Runner interface {
 	Start() Runner
 	Stop() chan error
 	Wait() error
+	AvailableWorkers() int64
 }
 
 type runner struct {
@@ -199,6 +200,11 @@ func (r *runner) waitForDrain() {
 	}
 }
 
+// AvailableWorkers .
+func (r *runner) AvailableWorkers() int64 {
+	return r.numWorkers - int64(len(r.limiter))
+}
+
 // startWork Runs the before function and starts processing until one of three things happen.
 // 1. A term signal is received or cancellation of context.
 // 2. Stop function is called.