--- a/src/SbpOperators/stencil.jl	Mon Feb 07 14:34:03 2022 +0100
+++ b/src/SbpOperators/stencil.jl	Thu Feb 10 10:57:00 2022 +0100
@@ -102,6 +102,14 @@
     return CenteredNestedStencil(inner_stencils...)
 end
 
+
+# Conversion
+function NestedStencil{T}(ns::NestedStencil) where T
+    return NestedStencil(Stencil{Stencil{T}}(ns.s))
+end
+
+Base.convert(::Type{NestedStencil{T}}, stencil) where T = NestedStencil{T}(stencil)
+
 Base.eltype(::NestedStencil{T}) where T = T
 
 function flip(ns::NestedStencil)

--- a/test/SbpOperators/stencil_test.jl	Mon Feb 07 14:34:03 2022 +0100
+++ b/test/SbpOperators/stencil_test.jl	Thu Feb 10 10:57:00 2022 +0100
@@ -60,11 +60,19 @@
             center=1
         ))
 
-
         @testset "Error handling" begin
         end
     end
 
+    @testset "conversion" begin
+        ns = NestedStencil((-1,1,0),(-1,0,1),(0,-1,1), center=2)
+        @test NestedStencil{Float64}(ns) == NestedStencil((-1.,1.,0.),(-1.,0.,1.),(0.,-1.,1.), center=2)
+        @test NestedStencil{Rational}(ns) == NestedStencil((-1//1,1//1,0//1),(-1//1,0//1,1//1),(0//1,-1//1,1//1), center=2)
+
+        @test convert(NestedStencil{Float64}, ns) == NestedStencil((-1.,1.,0.),(-1.,0.,1.),(0.,-1.,1.), center=2)
+        @test convert(NestedStencil{Rational}, ns) == NestedStencil((-1//1,1//1,0//1),(-1//1,0//1,1//1),(0//1,-1//1,1//1), center=2)
+    end
+
     @testset "apply" begin
         c = [  1,  3,  6, 10, 15, 21, 28, 36, 45, 55]
         v = [  2,  3,  5,  7, 11, 13, 17, 19, 23, 29]