diff --git a/source/adios2/core/Operator.cpp b/source/adios2/core/Operator.cpp
index 4d5eacbe46..692f7a5545 100644
--- a/source/adios2/core/Operator.cpp
+++ b/source/adios2/core/Operator.cpp
@@ -51,24 +51,6 @@ void Operator::RunCallback2(void *arg0, const std::string &arg1,
     CheckCallbackType("Callback2");
 }
 
-size_t Operator::BufferMaxSize(const size_t sizeIn) const
-{
-    throw std::invalid_argument("ERROR: signature (const size_t) not supported "
-                                "by derived class implemented with " +
-                                m_Type + ", in call to BufferMaxSize\n");
-}
-
-#define declare_type(T)                                                        \
-    template <>                                                                \
-    size_t Operator::BufferMaxSize<T>(const T *dataIn, const Dims &dimensions, \
-                                      const Params &parameters) const          \
-    {                                                                          \
-        return DoBufferMaxSize(dataIn, dimensions, helper::GetDataType<T>(),   \
-                               parameters);                                    \
-    }
-ADIOS2_FOREACH_ZFP_TYPE_1ARG(declare_type)
-#undef declare_type
-
 size_t Operator::Compress(const void * /*dataIn*/, const Dims & /*dimensions*/,
                           DataType /*type*/, void * /*bufferOut*/,
                           const Params & /*params*/, Params & /*info*/)
@@ -92,14 +74,6 @@ size_t Operator::Decompress(const void *bufferIn, const size_t sizeIn,
 }
 
 // PROTECTED
-size_t Operator::DoBufferMaxSize(const void *dataIn, const Dims &dimensions,
-                                 DataType type, const Params &parameters) const
-{
-    throw std::invalid_argument("ERROR: signature (const void*, const Dims& "
-                                "std::string ) not supported "
-                                "by derived class implemented with " +
-                                m_Type + ", in call to BufferMaxSize\n");
-}
 
 Dims Operator::ConvertDims(const Dims &dimensions, const DataType type,
                            const size_t targetDims, const bool enforceDims,
diff --git a/source/adios2/core/Operator.h b/source/adios2/core/Operator.h
index 81a7a74aa9..09326808f9 100644
--- a/source/adios2/core/Operator.h
+++ b/source/adios2/core/Operator.h
@@ -57,23 +57,6 @@ class Operator
     virtual void RunCallback2(void *, const std::string &, const std::string &,
                               const std::string &, const size_t, const Dims &,
                               const Dims &, const Dims &) const;
-    /**
-     * Returns a conservative buffer size to hold input data for classes
-     * @param sizeIn size of input data to be compressed in bytes
-     * @return recommended allocation for output buffer
-     */
-    virtual size_t BufferMaxSize(const size_t sizeIn) const;
-
-    /**
-     * Used by Zfp
-     * Returns a conservative buffer size to hold input data for classes
-     * @param dataIn
-     * @param dimensions
-     * @return recommended allocation for output buffer in bytes
-     */
-    template <class T>
-    size_t BufferMaxSize(const T *dataIn, const Dims &dimensions,
-                         const Params &params) const;
 
     /**
      * @param dataIn
@@ -98,18 +81,6 @@ class Operator
     /** Parameters associated with a particular Operator */
     Params m_Parameters;
 
-    /**
-     * Used by CompressZfp
-     * Returns a conservative buffer size to hold input data for classes
-     * @param dataIn
-     * @param dimensions
-     * @param type
-     * @return conservative buffer size for allocation
-     */
-    virtual size_t DoBufferMaxSize(const void *dataIn, const Dims &dimensions,
-                                   DataType type,
-                                   const Params &parameters) const;
-
     /**
      * Used by lossy compressors with a limitation on complex data types or
      * dimentions Returns a adios2::Dims object that meets the requirement of a
diff --git a/source/adios2/operator/compress/CompressBZIP2.cpp b/source/adios2/operator/compress/CompressBZIP2.cpp
index e7931f0280..bd57e972e7 100644
--- a/source/adios2/operator/compress/CompressBZIP2.cpp
+++ b/source/adios2/operator/compress/CompressBZIP2.cpp
@@ -32,11 +32,6 @@ CompressBZIP2::CompressBZIP2(const Params &parameters)
 {
 }
 
-size_t CompressBZIP2::BufferMaxSize(const size_t sizeIn) const
-{
-    return static_cast<size_t>(std::ceil(1.1 * sizeIn) + 600);
-}
-
 size_t CompressBZIP2::Compress(const void *dataIn, const Dims &dimensions,
                                DataType type, void *bufferOut,
                                const Params &parameters, Params &info)
diff --git a/source/adios2/operator/compress/CompressBZIP2.h b/source/adios2/operator/compress/CompressBZIP2.h
index b1ae536cc7..d40a30af35 100644
--- a/source/adios2/operator/compress/CompressBZIP2.h
+++ b/source/adios2/operator/compress/CompressBZIP2.h
@@ -31,8 +31,6 @@ class CompressBZIP2 : public Operator
 
     ~CompressBZIP2() = default;
 
-    size_t BufferMaxSize(const size_t sizeIn) const final;
-
     /**
      * Compression signature for legacy libraries that use void*
      * @param dataIn
diff --git a/source/adios2/operator/compress/CompressBlosc.cpp b/source/adios2/operator/compress/CompressBlosc.cpp
index 905e7b67d5..f1e98948ca 100644
--- a/source/adios2/operator/compress/CompressBlosc.cpp
+++ b/source/adios2/operator/compress/CompressBlosc.cpp
@@ -42,25 +42,6 @@ CompressBlosc::CompressBlosc(const Params &parameters)
 {
 }
 
-size_t CompressBlosc::BufferMaxSize(const size_t sizeIn) const
-{
-    const size_t maxInputPerChunk = BLOSC_MAX_BUFFERSIZE;
-    const size_t numFullChunks = sizeIn / maxInputPerChunk;
-    const size_t sizeLastChunk = sizeIn % maxInputPerChunk;
-
-    const size_t maxOutputPerChunk = maxInputPerChunk + BLOSC_MAX_OVERHEAD;
-    const size_t maxOutputLastChunk = sizeLastChunk + BLOSC_MAX_OVERHEAD;
-
-    /* DataHeader is used to detect of old format which can only handle
-     * BLOSC_MAX_BUFFERSIZE (<2GiB) or the new adios2 chunked blosc format is
-     * used.
-     */
-    const size_t maxRquiredDataMem = maxOutputPerChunk * numFullChunks +
-                                     maxOutputLastChunk + sizeof(DataHeader);
-
-    return maxRquiredDataMem;
-}
-
 size_t CompressBlosc::Compress(const void *dataIn, const Dims &dimensions,
                                DataType type, void *bufferOut,
                                const Params &parameters, Params &info)
diff --git a/source/adios2/operator/compress/CompressBlosc.h b/source/adios2/operator/compress/CompressBlosc.h
index d26644cbfb..46f3e0fe57 100644
--- a/source/adios2/operator/compress/CompressBlosc.h
+++ b/source/adios2/operator/compress/CompressBlosc.h
@@ -43,8 +43,6 @@ class CompressBlosc : public Operator
 
     ~CompressBlosc() = default;
 
-    size_t BufferMaxSize(const size_t sizeIn) const final;
-
     /**
      * Compression signature for legacy libraries that use void*
      * @param dataIn
diff --git a/source/adios2/operator/compress/CompressLibPressio.cpp b/source/adios2/operator/compress/CompressLibPressio.cpp
index 8630820b1c..436d2ed949 100644
--- a/source/adios2/operator/compress/CompressLibPressio.cpp
+++ b/source/adios2/operator/compress/CompressLibPressio.cpp
@@ -285,11 +285,6 @@ CompressLibPressio::CompressLibPressio(const Params &parameters)
 {
 }
 
-size_t CompressLibPressio::BufferMaxSize(const size_t sizeIn) const
-{
-    return static_cast<size_t>(std::ceil(1.1 * sizeIn) + 600);
-}
-
 size_t CompressLibPressio::Compress(const void *dataIn, const Dims &dimensions,
                                     DataType varType, void *bufferOut,
                                     const Params &parameters, Params &info)
diff --git a/source/adios2/operator/compress/CompressLibPressio.h b/source/adios2/operator/compress/CompressLibPressio.h
index d2be0d30e2..65094d55a1 100644
--- a/source/adios2/operator/compress/CompressLibPressio.h
+++ b/source/adios2/operator/compress/CompressLibPressio.h
@@ -31,8 +31,6 @@ class CompressLibPressio : public Operator
 
     ~CompressLibPressio() = default;
 
-    size_t BufferMaxSize(const size_t sizeIn) const final;
-
     /**
      * Compression signature for legacy libraries that use void*
      * @param dataIn
diff --git a/source/adios2/operator/compress/CompressSZ.cpp b/source/adios2/operator/compress/CompressSZ.cpp
index 8cf008da61..a8a5e4de31 100644
--- a/source/adios2/operator/compress/CompressSZ.cpp
+++ b/source/adios2/operator/compress/CompressSZ.cpp
@@ -29,11 +29,6 @@ namespace compress
 
 CompressSZ::CompressSZ(const Params &parameters) : Operator("sz", parameters) {}
 
-size_t CompressSZ::BufferMaxSize(const size_t sizeIn) const
-{
-    return static_cast<size_t>(std::ceil(1.1 * sizeIn) + 600);
-}
-
 size_t CompressSZ::Compress(const void *dataIn, const Dims &dimensions,
                             DataType varType, void *bufferOut,
                             const Params &parameters, Params &info)
diff --git a/source/adios2/operator/compress/CompressSZ.h b/source/adios2/operator/compress/CompressSZ.h
index 604ea3b787..c0d31099ba 100644
--- a/source/adios2/operator/compress/CompressSZ.h
+++ b/source/adios2/operator/compress/CompressSZ.h
@@ -31,8 +31,6 @@ class CompressSZ : public Operator
 
     ~CompressSZ() = default;
 
-    size_t BufferMaxSize(const size_t sizeIn) const final;
-
     /**
      * Compression signature for legacy libraries that use void*
      * @param dataIn
diff --git a/source/adios2/operator/compress/CompressZFP.cpp b/source/adios2/operator/compress/CompressZFP.cpp
index af2b3110d5..35ba0e7429 100644
--- a/source/adios2/operator/compress/CompressZFP.cpp
+++ b/source/adios2/operator/compress/CompressZFP.cpp
@@ -22,19 +22,6 @@ CompressZFP::CompressZFP(const Params &parameters) : Operator("zfp", parameters)
 {
 }
 
-size_t CompressZFP::DoBufferMaxSize(const void *dataIn, const Dims &dimensions,
-                                    DataType type,
-                                    const Params &parameters) const
-{
-    Dims convertedDims = ConvertDims(dimensions, type, 3);
-    zfp_field *field = GetZFPField(dataIn, convertedDims, type);
-    zfp_stream *stream = GetZFPStream(convertedDims, type, parameters);
-    const size_t maxSize = zfp_stream_maximum_size(stream, field);
-    zfp_field_free(field);
-    zfp_stream_close(stream);
-    return maxSize;
-}
-
 size_t CompressZFP::Compress(const void *dataIn, const Dims &dimensions,
                              DataType type, void *bufferOut,
                              const Params &parameters, Params &info)
diff --git a/source/adios2/operator/compress/CompressZFP.h b/source/adios2/operator/compress/CompressZFP.h
index 42f3c27c54..01326b286b 100644
--- a/source/adios2/operator/compress/CompressZFP.h
+++ b/source/adios2/operator/compress/CompressZFP.h
@@ -88,9 +88,6 @@ class CompressZFP : public Operator
     zfp_stream *GetZFPStream(const Dims &dimensions, DataType type,
                              const Params &parameters) const;
 
-    size_t DoBufferMaxSize(const void *dataIn, const Dims &dimensions,
-                           DataType type, const Params &parameters) const final;
-
     /**
      * check status from BZip compression and decompression functions
      * @param status returned by BZip2 library