diff --git a/cmd/conv/main.go b/cmd/conv/main.go
index 063baed..6ea6478 100644
--- a/cmd/conv/main.go
+++ b/cmd/conv/main.go
@@ -1,56 +1,23 @@
 package main
 
 import (
-	"bytes"
 	_ "embed"
 	"fmt"
 	"log"
-	"strconv"
+	"os"
 
-	"git.ecogood.org/andreas.schroepfer/excelConverter/pkg/ecalc"
 	"git.ecogood.org/andreas.schroepfer/excelConverter/pkg/loader"
-	"git.ecogood.org/andreas.schroepfer/excelConverter/pkg/set"
-	excelize "github.com/360EntSecGroup-Skylar/excelize/v2"
 )
 
 //go:embed default.json
 var defaultConf []byte
 
 func main() {
-	buf := bytes.NewBuffer(defaultConf)
-	conf := &loader.Conf{}
-	err := conf.DecodeJSON(buf)
-	//fmt.Println(err, conf)
-
-	eBalance := ecalc.Ecalc{
-		CompanyFacts: ecalc.CompanyFacts{},
+	xf, err := os.Open("../../test/gwb-rechner_5_0_4_vollbilanz.xlsx")
+	if err != nil {
+		log.Fatal("cannot open file:", err)
 	}
-	xFile, err := excelize.OpenFile("../../test/gwb-rechner_5_0_4_vollbilanz.xlsx")
-	fmt.Println("openFile err :", err)
-	//sheets := make(map[int])
-	for _, v := range conf.Values {
-		cellValue, err := xFile.GetCellValue(
-			xFile.GetSheetName(v.Sheet),
-			v.Cell,
-		)
-		if err != nil {
-			log.Println("error", err)
-		}
-		var inValue interface{}
-		switch v.Struct {
-		case "CompanyFacts":
-			switch v.Type {
-			case "int":
-				inValue, err = strconv.Atoi(cellValue)
-				if err != nil {
-					fmt.Println(xFile.GetSheetName(v.Sheet))
-					fmt.Println("err ATOI", err)
-				}
-			default:
-				inValue = cellValue
-			}
-			set.Field(&eBalance.CompanyFacts, v.Field, inValue)
-		}
-	}
-	fmt.Printf("%#v", eBalance)
+	defer xf.Close()
+	eBalance, err := loader.XLSX(xf, nil)
+	fmt.Printf("%s\n%#v", err, eBalance.CompanyFacts.IndustrySectors)
 }
diff --git a/cmd/test/main.go b/cmd/test/main.go
deleted file mode 100644
index 6ec5cdd..0000000
--- a/cmd/test/main.go
+++ /dev/null
@@ -1,14 +0,0 @@
-package main
-
-import (
-	"fmt"
-
-	xlsx "github.com/tealeg/xlsx/v3"
-)
-
-func main() {
-	xls, err := xlsx.OpenFile("../../test/gwb-rechner_5_0_4_vollbilanz.xlsx")
-	fmt.Println("OpenFile err:", err)
-	sl, err := xls.ToSlice()
-	fmt.Printf("err: %v\n\n%#v", err, sl[1])
-}
diff --git a/cmd/test2/conf.json b/cmd/test2/conf.json
deleted file mode 100644
index e1c5d58..0000000
--- a/cmd/test2/conf.json
+++ /dev/null
@@ -1,43 +0,0 @@
-{
-  "title": "",
-  "version": "",
-  "values": [
-    {
-      "sheet": 0,
-      "cell": "",
-      "type": "",
-      "struct": "",
-      "field": "",
-      "default": ""
-    }
-  ],
-  "areas": [
-    {
-      "sheet": 0,
-      "start_row": 0,
-      "end_row": 0,
-      "struct": "",
-      "cols": [
-        {
-          "col": "",
-          "field": "",
-          "type": "",
-          "default": ""
-        }
-      ]
-    }
-  ],
-  "rating": {
-    "sheet": 0,
-    "start_row": 0,
-    "end_row": 0,
-    "points_col": "",
-    "max_points_col": "",
-    "id_col": "",
-    "short_name_col": "",
-    "name_col": "",
-    "estimations_col": "",
-    "weight_col": "",
-    "selected_by_user_col": ""
-  }
-}
diff --git a/cmd/test2/main.go b/cmd/test2/main.go
deleted file mode 100644
index 957052f..0000000
--- a/cmd/test2/main.go
+++ /dev/null
@@ -1,28 +0,0 @@
-package main
-
-import (
-	"fmt"
-	"os"
-
-	"git.ecogood.org/andreas.schroepfer/excelConverter/pkg/loader"
-	excelize "github.com/360EntSecGroup-Skylar/excelize/v2"
-)
-
-func main() {
-	xFile, err := excelize.OpenFile("../../test/gwb-rechner_5_0_4_vollbilanz.xlsx")
-	fmt.Println("openFile err :", err)
-	sheets := xFile.GetSheetMap()
-	rows, _ := xFile.GetRows(sheets[4])
-	fmt.Printf("%#v", rows)
-	c := loader.Conf{}
-	c.Values = append(c.Values, loader.Value{})
-	c.Areas = append(c.Areas, loader.Area{
-		Cols: []loader.AreaCol{
-			loader.AreaCol{},
-		},
-	})
-	fd, err := os.OpenFile("conf.json", os.O_CREATE, 0777)
-	fmt.Println(err)
-	defer fd.Close()
-	c.EncodeJSON(fd)
-}
diff --git a/pkg/ecalc/ecalc.go b/pkg/ecalc/ecalc.go
index 71fdc67..612d72d 100644
--- a/pkg/ecalc/ecalc.go
+++ b/pkg/ecalc/ecalc.go
@@ -24,7 +24,7 @@ type CompanyFacts struct {
 	NumberOfEmployees                int                 `json:"numberOfEmployees,omitempty"`
 	HasCanteen                       bool                `json:"hasCanteen,omitempty"`
 	IsB2B                            bool                `json:"isB2B,omitempty"`
-	AverageJourneyToWorkForStaffInKm float32             `json:"averageJourneyToWorkForStaffInKm,omitempty"`
+	AverageJourneyToWorkForStaffInKm float64             `json:"averageJourneyToWorkForStaffInKm,omitempty"`
 	Rating                           Rating              `json:"rating,omitempty"`
 }
 
@@ -38,7 +38,7 @@ type SupplyFraction struct {
 type EmployeesFraction struct {
 	ID          int     `json:"id,omitempty"`
 	CountryCode string  `json:"countryCode,omitempty"`
-	Percentage  float32 `json:"percentage,omitempty"`
+	Percentage  float64 `json:"percentage,omitempty"`
 }
 
 type IndustrySector struct {
@@ -54,24 +54,24 @@ type Rating struct {
 
 type Topic struct {
 	Points                 int      `json:"points,omitempty"`
-	MaxPoints              float32  `json:"maxPoints,omitempty"`
+	MaxPoints              float64  `json:"maxPoints,omitempty"`
 	ID                     int      `json:"id,omitempty"`
 	ShortName              string   `json:"shortName,omitempty"`
 	Name                   string   `json:"name,omitempty"`
 	Estimations            int      `json:"estimations,omitempty"`
-	Weight                 float32  `json:"weight,omitempty"`
+	Weight                 float64  `json:"weight,omitempty"`
 	IsWeightSelectedByUser bool     `json:"isWeightSelectedByUser,omitempty"`
 	Aspects                []Aspect `json:"aspects,omitempty"`
 }
 
 type Aspect struct {
 	Points                 int      `json:"points,omitempty"`
-	MaxPoints              float32  `json:"maxPoints,omitempty"`
+	MaxPoints              float64  `json:"maxPoints,omitempty"`
 	ID                     int      `json:"id,omitempty"`
 	ShortName              string   `json:"shortName,omitempty"`
 	Name                   string   `json:"name,omitempty"`
 	Estimations            int      `json:"estimations,omitempty"`
-	Weight                 float32  `json:"weight,omitempty"`
+	Weight                 float64  `json:"weight,omitempty"`
 	IsWeightSelectedByUser bool     `json:"isWeightSelectedByUser,omitempty"`
 	Aspects                []Aspect `json:"aspects,omitempty"`
 	IsPositive             bool     `json:"isPositive,omitempty"`
diff --git a/pkg/loader/conf.go b/pkg/loader/conf.go
index 33092b9..5cdeab5 100644
--- a/pkg/loader/conf.go
+++ b/pkg/loader/conf.go
@@ -1,10 +1,28 @@
 package loader
 
 import (
+	"bytes"
+	_ "embed"
 	"encoding/json"
 	"io"
+	"log"
 )
 
+//go:embed conf/default.json
+var defaultConf []byte
+
+// DefaultConf loads the defaultConf of the package. The base
+// is the default.json inside the package definition.
+func DefaultConf() *Conf {
+	buf := bytes.NewBuffer(defaultConf)
+	conf := &Conf{}
+	err := conf.DecodeJSON(buf)
+	if err != nil {
+		log.Println("cannot decode default conf: ", err)
+	}
+	return conf
+}
+
 // Conf configures the mapping from the excel version
 // to the eCalc structure
 type Conf struct {
@@ -15,6 +33,20 @@ type Conf struct {
 	Rating  Rating  `json:"rating"`
 }
 
+// EncodeJSON writes the JSON of the conf into the Writer
+func (c Conf) EncodeJSON(w io.Writer) error {
+	enc := json.NewEncoder(w)
+	enc.SetIndent("", "  ")
+	return enc.Encode(c)
+}
+
+// DecodeJSON writes the configuration from the reader into
+// the pointer of the conf
+func (c *Conf) DecodeJSON(r io.Reader) error {
+	dec := json.NewDecoder(r)
+	return dec.Decode(c)
+}
+
 // Value defines a single value inside the excel workbook
 type Value struct {
 	Sheet   int    `json:"sheet"`
@@ -61,17 +93,3 @@ type Rating struct {
 	WeightCol         string `json:"weight_col"`
 	SelectedByUserCol string `json:"selected_by_user_col"`
 }
-
-// EncodeJSON writes the JSON of the conf into the Writer
-func (c Conf) EncodeJSON(w io.Writer) error {
-	enc := json.NewEncoder(w)
-	enc.SetIndent("", "  ")
-	return enc.Encode(c)
-}
-
-// DecodeJSON writes the configuration from the reader into
-// the pointer of the conf
-func (c *Conf) DecodeJSON(r io.Reader) error {
-	dec := json.NewDecoder(r)
-	return dec.Decode(c)
-}
diff --git a/conf/default.json b/pkg/loader/conf/default.json
similarity index 91%
rename from conf/default.json
rename to pkg/loader/conf/default.json
index 275b2dd..6184fe6 100644
--- a/conf/default.json
+++ b/pkg/loader/conf/default.json
@@ -3,7 +3,7 @@
     "version": "5.04",
     "values": [
       {
-        "sheet": 3,
+        "sheet": 2,
         "cell": "C7",
         "type": "int",
         "struct": "CompanyFacts",
@@ -11,7 +11,7 @@
         "default": ""
       },
       {
-        "sheet": 3,
+        "sheet": 2,
         "cell": "C27",
         "type": "int",
         "struct": "CompanyFacts",
@@ -19,7 +19,7 @@
         "default": ""
       },
       {
-        "sheet": 3,
+        "sheet": 2,
         "cell": "C18",
         "type": "int",
         "struct": "CompanyFacts",
@@ -27,7 +27,7 @@
         "default": ""
       },
       {
-        "sheet": 3,
+        "sheet": 2,
         "cell": "C19",
         "type": "int",
         "struct": "CompanyFacts",
@@ -35,7 +35,7 @@
         "default": ""
       },
       {
-        "sheet": 3,
+        "sheet": 2,
         "cell": "C20",
         "type": "int",
         "struct": "CompanyFacts",
@@ -43,7 +43,7 @@
         "default": ""
       },
       {
-        "sheet": 3,
+        "sheet": 2,
         "cell": "C22",
         "type": "int",
         "struct": "CompanyFacts",
@@ -51,7 +51,7 @@
         "default": ""
       },
       {
-        "sheet": 3,
+        "sheet": 2,
         "cell": "C37",
         "type": "int",
         "struct": "CompanyFacts",
@@ -59,7 +59,7 @@
         "default": ""
       },
       {
-        "sheet": 3,
+        "sheet": 2,
         "cell": "C21",
         "type": "int",
         "struct": "CompanyFacts",
@@ -67,7 +67,7 @@
         "default": ""
       },
       {
-        "sheet": 3,
+        "sheet": 2,
         "cell": "C23",
         "type": "int",
         "struct": "CompanyFacts",
@@ -75,7 +75,7 @@
         "default": ""
       },
       {
-        "sheet": 3,
+        "sheet": 2,
         "cell": "C26",
         "type": "int",
         "struct": "CompanyFacts",
@@ -83,7 +83,7 @@
         "default": ""
       },
       {
-        "sheet": 3,
+        "sheet": 2,
         "cell": "C24",
         "type": "bool",
         "struct": "CompanyFacts",
@@ -91,7 +91,7 @@
         "default": ""
       },
       {
-        "sheet": 3,
+        "sheet": 2,
         "cell": "C38",
         "type": "bool",
         "struct": "CompanyFacts",
@@ -99,7 +99,7 @@
         "default": ""
       },
       {
-        "sheet": 3,
+        "sheet": 2,
         "cell": "C33",
         "type": "int",
         "struct": "CompanyFacts",
@@ -109,7 +109,7 @@
     ],
     "areas": [
       {
-        "sheet": "3",
+        "sheet": 2,
         "start_row": 10,
         "end_row": 14,
         "struct": "SupplyFraction",
@@ -135,7 +135,7 @@
         ]
       },
       {
-        "sheet": "3",
+        "sheet": 2,
         "start_row": 30,
         "end_row": 32,
         "struct": "EmployeesFraction",
@@ -149,13 +149,13 @@
           {
             "col": "D",
             "field": "Percentage",
-            "type": "float32",
+            "type": "float64",
             "default": ""
           }
         ]
       },
       {
-        "sheet": "3",
+        "sheet": 2,
         "start_row": 41,
         "end_row": 43,
         "struct": "IndustrySector",
@@ -182,7 +182,7 @@
       }
     ],
     "rating": {
-        "sheet": 4,
+        "sheet": 3,
         "start_row": 9,
         "end_row": 93,
         "points_col": "I",
diff --git a/pkg/loader/loader.go b/pkg/loader/loader.go
new file mode 100644
index 0000000..4470237
--- /dev/null
+++ b/pkg/loader/loader.go
@@ -0,0 +1,99 @@
+package loader
+
+import (
+	"fmt"
+	"io"
+
+	"git.ecogood.org/andreas.schroepfer/excelConverter/pkg/ecalc"
+	"git.ecogood.org/andreas.schroepfer/excelConverter/pkg/set"
+	"github.com/360EntSecGroup-Skylar/excelize/v2"
+)
+
+// XLSX reads the data out of the reader. If conf is nil
+// the default configuration is used.
+func XLSX(r io.Reader, conf *Conf) (*ecalc.Ecalc, error) {
+	eBalance := &ecalc.Ecalc{}
+	var errs []error
+
+	if conf == nil {
+		conf = DefaultConf()
+	}
+	xFile, err := excelize.OpenReader(r)
+	if err != nil {
+		return nil, fmt.Errorf("XLSX.OpenReader: %w", err)
+	}
+	for _, v := range conf.Values {
+		cellValue, err := xFile.GetCellValue(
+			xFile.GetSheetName(v.Sheet),
+			v.Cell,
+		)
+		if err != nil {
+			errs = append(errs, err)
+		}
+		switch v.Struct {
+		case "CompanyFacts":
+			set.Field(&eBalance.CompanyFacts, v.Field, cellValue)
+		}
+	}
+	for _, a := range conf.Areas {
+		switch a.Struct {
+		case "SupplyFraction":
+			for r := a.StartRow; r <= a.EndRow; r++ {
+				sf := ecalc.SupplyFraction{}
+				for _, c := range a.Cols {
+					cellValue, err := xFile.GetCellValue(
+						xFile.GetSheetName(a.Sheet),
+						fmt.Sprintf("%s%d", c.Col, r),
+					)
+					if err != nil {
+						errs = append(errs, err)
+					}
+					set.Field(&sf, c.Field, cellValue)
+				}
+				eBalance.CompanyFacts.SupplyFractions =
+					append(
+						eBalance.CompanyFacts.SupplyFractions,
+						sf)
+			}
+		case "EmployeesFraction":
+			for r := a.StartRow; r <= a.EndRow; r++ {
+				ef := ecalc.EmployeesFraction{}
+				for _, c := range a.Cols {
+					cellValue, err := xFile.GetCellValue(
+						xFile.GetSheetName(a.Sheet),
+						fmt.Sprintf("%s%d", c.Col, r),
+					)
+					if err != nil {
+						errs = append(errs, err)
+					}
+					set.Field(&ef, c.Field, cellValue)
+				}
+				eBalance.CompanyFacts.EmployeesFractions =
+					append(
+						eBalance.CompanyFacts.EmployeesFractions,
+						ef)
+			}
+		case "IndustrySector":
+			for r := a.StartRow; r <= a.EndRow; r++ {
+				is := ecalc.IndustrySector{}
+				for _, c := range a.Cols {
+					cellValue, err := xFile.GetCellValue(
+						xFile.GetSheetName(a.Sheet),
+						fmt.Sprintf("%s%d", c.Col, r),
+					)
+					if err != nil {
+						errs = append(errs, err)
+					}
+					set.Field(&is, c.Field, cellValue)
+				}
+				eBalance.CompanyFacts.IndustrySectors =
+					append(
+						eBalance.CompanyFacts.IndustrySectors,
+						is)
+			}
+		}
+
+	}
+	// TODO: error handling of errs
+	return eBalance, nil
+}
diff --git a/pkg/set/set.go b/pkg/set/set.go
index 36b42b0..9db6c90 100644
--- a/pkg/set/set.go
+++ b/pkg/set/set.go
@@ -3,16 +3,37 @@ package set
 import (
 	"errors"
 	"reflect"
+	"strconv"
 )
 
-func Field(dst interface{}, fieldName string, value interface{}) error {
+var (
+	ErrTypeConvert = errors.New("cannot convert input")
+)
+
+func Field(dst interface{}, fieldName string, value string) error {
 
 	valDst := reflect.ValueOf(dst).Elem()
 	dstField := valDst.FieldByName(fieldName)
 
 	val := reflect.ValueOf(value)
 	if dstField.Kind() != val.Kind() {
-		return errors.New("value-Type does not match to field")
+		// try to convert
+		switch dstField.Kind() {
+		case reflect.Int:
+			d, err := strconv.Atoi(value)
+			if err != nil {
+				return ErrTypeConvert
+			}
+			val = reflect.ValueOf(d)
+		case reflect.Float64:
+			f, err := strconv.ParseFloat(value, 64)
+			if err != nil {
+				return ErrTypeConvert
+			}
+			val = reflect.ValueOf(f)
+		default:
+			return ErrTypeConvert
+		}
 	}
 
 	dstField.Set(val)
diff --git a/pkg/set/set_test.go b/pkg/set/set_test.go
index bd492a6..037a31f 100644
--- a/pkg/set/set_test.go
+++ b/pkg/set/set_test.go
@@ -6,6 +6,7 @@ func TestField(t *testing.T) {
 	input := struct {
 		MyString string
 		MyInt    int
+		MyFloat  float64
 		MyBool   bool
 	}{}
 	value := "abc"
@@ -13,15 +14,21 @@ func TestField(t *testing.T) {
 	if input.MyString != value {
 		t.Errorf("got: %s; want: %s", input.MyString, value)
 	}
-	vInt := 2
-	Field(&input, "MyInt", vInt)
-	if input.MyInt != vInt {
-		t.Errorf("MyInt: %d, want: %d", input.MyInt, vInt)
+	err := Field(&input, "MyFloat", "3.14")
+	if err != nil {
+		t.Error("expect no error, when can be converted")
 	}
-	err := Field(&input, "MyInt", "vInt")
+	if input.MyFloat != 3.14 {
+		t.Errorf("MyFloat is not 3.14. Got: %#v", input.MyFloat)
+	}
+	err = Field(&input, "MyInt", "vInt")
 	if err == nil {
 		t.Error("expect error, when wrong value-Type")
 	}
+	err = Field(&input, "MyInt", "3")
+	if err != nil {
+		t.Error("expect no error, when can be converted")
+	}
 	err = Field(&input, "NoField", "jjj")
 	if err == nil {
 		t.Error("expect error, when field not exists")
diff --git a/test/gwb-rechner_5_0_4_vollbilanz.xlsx b/test/gwb-rechner_5_0_4_vollbilanz.xlsx
index beb35dd..6fa4217 100644
Binary files a/test/gwb-rechner_5_0_4_vollbilanz.xlsx and b/test/gwb-rechner_5_0_4_vollbilanz.xlsx differ