diff --git a/Project.toml b/Project.toml
index 77f515b7..37c51bc8 100644
--- a/Project.toml
+++ b/Project.toml
@@ -5,12 +5,10 @@ version = "0.2.0"
 
 [deps]
 Requires = "ae029012-a4dd-5104-9daa-d747884805df"
-
-[weakdeps]
+SaferIntegers = "88634af6-177f-5301-88b8-7819386cfa38"
 Unitful = "1986cc42-f94f-5a68-af5c-568840ba703d"
 
-[extensions]
-DynamicQuantitiesUnitfulExt = "Unitful"
+
 
 [compat]
 Requires = "1"
@@ -22,7 +20,8 @@ Ratios = "c84ed2f1-dad5-54f0-aa8e-dbefe2724439"
 SaferIntegers = "88634af6-177f-5301-88b8-7819386cfa38"
 SafeTestsets = "1bc83da4-3b8d-516f-aca4-4fe02f6d838f"
 Test = "8dfed614-e22c-5e08-85e1-65c5234f0b40"
-Unitful = "1986cc42-f94f-5a68-af5c-568840ba703d"
+Documenter = "e30172f5-a6a5-5a46-863b-614d45cd2de4"
 
 [targets]
-test = ["Test", "Ratios", "SaferIntegers", "SafeTestsets", "Unitful"]
+test = ["Test", "Ratios", "SaferIntegers", "SafeTestsets", "Documenter"]
+
diff --git a/docs/Project.toml b/docs/Project.toml
index 14f45c27..386c65a2 100644
--- a/docs/Project.toml
+++ b/docs/Project.toml
@@ -1,3 +1,4 @@
 [deps]
 Documenter = "e30172f5-a6a5-5a46-863b-614d45cd2de4"
 DynamicQuantities = "06fc5a27-2a28-4c7c-a15d-362465fb6821"
+Unitful = "1986cc42-f94f-5a68-af5c-568840ba703d"
diff --git a/docs/make.jl b/docs/make.jl
index c0d62263..efb1982e 100644
--- a/docs/make.jl
+++ b/docs/make.jl
@@ -30,6 +30,8 @@ makedocs(;
     authors="MilesCranmer <miles.cranmer@gmail.com> and contributors",
     repo="https://github.com/SymbolicML/DynamicQuantities.jl/blob/{commit}{path}#{line}",
     sitename="DynamicQuantities.jl",
+         clean = false, 
+         doctest = true,
     format=Documenter.HTML(;
         prettyurls=get(ENV, "CI", "false") == "true",
         canonical="https://symbolicml.org/DynamicQuantities.jl",
diff --git a/docs/src/api.md b/docs/src/api.md
index 6cab9efe..403440d1 100644
--- a/docs/src/api.md
+++ b/docs/src/api.md
@@ -11,5 +11,5 @@ API Reference for [DynamicQuantities](https://github.com/SymbolicML/DynamicQuant
 
 ```@autodocs
 Modules = [DynamicQuantities]
-Order   = [:type, :function]
-```
\ No newline at end of file
+Order   = [:type, :function, :macro]
+```
diff --git a/ext/DynamicQuantitiesUnitfulExt.jl b/ext/DynamicQuantitiesUnitfulExt.jl
index 0d14d1c8..3d4e9e38 100644
--- a/ext/DynamicQuantitiesUnitfulExt.jl
+++ b/ext/DynamicQuantitiesUnitfulExt.jl
@@ -62,4 +62,9 @@ function _map_dim_name_to_dynamic_units(::Type{Unitful.Dimension{D}}) where {D}
 end
 
 
+DynamicQuantities.dynquantity(u::Unitful.FreeUnits)=Base.convert(DynamicQuantities.Quantity,Unitful.upreferred(1u))
+DynamicQuantities.dynquantity(q::Unitful.AbstractQuantity) = Base.convert(DynamicQuantities.Quantity,Unitful.upreferred(q))
+DynamicQuantities.unitful(q::DynamicQuantities.Quantity) = Base.convert(Unitful.Quantity,q)
+Unitful.uconvert(u::Unitful.FreeUnits,q::DynamicQuantities.Quantity) = Unitful.uconvert(u, Base.convert(Unitful.Quantity,q))
+
 end
diff --git a/src/DynamicQuantities.jl b/src/DynamicQuantities.jl
index c62cbc0c..6e069469 100644
--- a/src/DynamicQuantities.jl
+++ b/src/DynamicQuantities.jl
@@ -1,16 +1,23 @@
 module DynamicQuantities
+import Unitful
 
 export Quantity, Dimensions, DimensionError, ustrip, dimension, valid
 export ulength, umass, utime, ucurrent, utemperature, uluminosity, uamount
 
+
+export @q_str,@dynquantities, unitful,dynquantity
+
+
+
 include("types.jl")
 include("utils.jl")
 include("math.jl")
 
-import Requires: @init, @require
+# import Requires: @init, @require
+# if !isdefined(Base, :get_extension)
+#     @init @require Unitful = "1986cc42-f94f-5a68-af5c-568840ba703d" include("../ext/DynamicQuantitiesUnitfulExt.jl")
+# end
 
-if !isdefined(Base, :get_extension)
-    @init @require Unitful = "1986cc42-f94f-5a68-af5c-568840ba703d" include("../ext/DynamicQuantitiesUnitfulExt.jl")
-end
+include("../ext/DynamicQuantitiesUnitfulExt.jl")
 
 end
diff --git a/src/utils.jl b/src/utils.jl
index 5aa903b0..078bc7b8 100644
--- a/src/utils.jl
+++ b/src/utils.jl
@@ -152,3 +152,84 @@ uluminosity(q::Quantity) = q.dimensions.luminosity
 Get the amount dimension of a quantity (e.g., mol^(uamount)).
 """
 uamount(q::Quantity) = q.dimensions.amount
+
+"""
+    dynquantity(u)
+
+Convert `Unitful.FreeUnits` or `Unitful.AbstractQuantity` to  `DynamicQuantities.quantity`.
+
+```jldoctest
+julia> dynquantity(u"cm")
+1//100 𝐋 ¹
+```
+
+```jldoctest
+julia> 1u"cm"|> dynquantity
+1//100 𝐋 ¹
+````
+
+"""
+function dynquantity end
+
+"""
+    unitful(q)
+
+Make `Quantity` unitful.
+
+```jldoctest
+julia> DynamicQuantities.Quantity(3.0,length=3) |> unitful
+3.0 m^3
+```
+"""
+function unitful end
+
+"""
+    uconvert(unit,q)
+
+Convert `Quantity` to a certain unitful unit.
+
+```jldoctest
+julia> DynamicQuantities.Quantity(3.0,length=3) |> u"dm^3"
+3000.0 dm^3
+```
+"""
+function uconvert end
+
+"""
+    @q_str(x)
+
+Construct Quantity via string macro.
+
+```jldoctest
+julia> q"kHz"
+1000 𝐓 ⁻¹
+```
+
+"""
+macro q_str(x)
+    quote
+        DynamicQuantities.dynquantity($(Unitful).@u_str($(x)))
+    end
+end
+
+
+function _dynquantities(xs...)
+    code = Expr(:block)
+    for x in xs
+        push!(code.args, :($x = DynamicQuantities.dynquantity($Unitful.$x)))
+    end
+    code
+end
+
+"""
+    @dynquantities
+
+Construct a list of quantity values
+```jldoctest
+julia> @dynquantities cm km Hz
+1 𝐓 ⁻¹ 
+```
+"""
+macro dynquantities(xs...)
+    esc(_dynquantities(xs...))
+end
diff --git a/test/runtests.jl b/test/runtests.jl
index 212af775..464ccb6a 100644
--- a/test/runtests.jl
+++ b/test/runtests.jl
@@ -1,14 +1,23 @@
-using SafeTestsets
+using SafeTestsets, DynamicQuantities
 import Ratios: SimpleRatio
 
 @static if !hasmethod(round, Tuple{Int, SimpleRatio{Int}})
     @eval Base.round(T, x::SimpleRatio) = round(T, x.num // x.den)
 end
 
+
+@safetestset "Unit tests" begin
+    include("unittests.jl")
+end
+
 @safetestset "Unitful.jl integration tests" begin
     include("test_unitful.jl")
 end
 
-@safetestset "Unit tests" begin
-    include("unittests.jl")
+@safetestset "doctests" begin
+    using Documenter, DynamicQuantities
+    DocMeta.setdocmeta!(DynamicQuantities, :DocTestSetup, :(using Unitful, DynamicQuantities); recursive=true)
+    Documenter.doctest(DynamicQuantities)
 end
+
+