diff --git a/bigint.go b/bigint.go
index 9be9e12..912bc3d 100644
--- a/bigint.go
+++ b/bigint.go
@@ -21,6 +21,11 @@ func (b BigInt) Int64() int64 {
 	return int64(b)
 }
 
+// Float64 returns the float64 representation of b
+func (b BigInt) Float64() float64 {
+	return float64(b.Int64())
+}
+
 // MarshalGQL implements the graphql.Marshaler interface found in
 // gqlgen, allowing the type to be marshaled by gqlgen and sent over
 // the wire.
diff --git a/biguint.go b/biguint.go
index 6031299..8bab9c2 100644
--- a/biguint.go
+++ b/biguint.go
@@ -21,6 +21,11 @@ func (b BigUInt) UInt64() uint64 {
 	return uint64(b)
 }
 
+// Float64 returns the float64 representation of b
+func (b BigUInt) Float64() float64 {
+	return float64(b.UInt64())
+}
+
 // MarshalGQL implements the graphql.Marshaler interface found in
 // gqlgen, allowing the type to be marshaled by gqlgen and sent over
 // the wire.