diff --git a/createtx.go b/createtx.go
index 0013f6f..3bb615b 100644
--- a/createtx.go
+++ b/createtx.go
@@ -370,20 +370,20 @@ func minimumFee(tx *btcwire.MsgTx, allowFree bool) btcutil.Amount {
 		}
 	}
 
-	max := btcutil.Amount(btcutil.MaxSatoshi)
-	if fee < 0 || fee > max {
-		fee = max
+	if fee < 0 || fee > btcutil.MaxSatoshi {
+		fee = btcutil.MaxSatoshi
 	}
 
 	return fee
 }
 
 // allowFree calculates the transaction priority and checks that the
-// priority reaches a certain threshhold.  If the threshhold is
+// priority reaches a certain threshold.  If the threshhold is
 // reached, a free transaction fee is allowed.
 func allowFree(curHeight int32, txouts []txstore.Credit, txSize int) bool {
-	const blocksPerDayEstimate = 144
-	const txSizeEstimate = 250
+	const blocksPerDayEstimate = 144.0
+	const txSizeEstimate = 250.0
+	const threshold = btcutil.SatoshiPerBitcoin * blocksPerDayEstimate / txSizeEstimate
 
 	var weightedSum int64
 	for _, txout := range txouts {
@@ -391,7 +391,7 @@ func allowFree(curHeight int32, txouts []txstore.Credit, txSize int) bool {
 		weightedSum += int64(txout.Amount()) * int64(depth)
 	}
 	priority := float64(weightedSum) / float64(txSize)
-	return priority > float64(btcutil.SatoshiPerBitcoin)*blocksPerDayEstimate/txSizeEstimate
+	return priority > threshold
 }
 
 // chainDepth returns the chaindepth of a target given the current
diff --git a/createtx_test.go b/createtx_test.go
index 70929e4..1e47940 100644
--- a/createtx_test.go
+++ b/createtx_test.go
@@ -38,7 +38,7 @@ var allowFreeTests = []allowFreeTest{
 		name: "priority < 57,600,000",
 		inputs: []*tx.Utxo{
 			{
-				Amt:    uint64(btcutil.SatoshiPerBitcoin),
+				Amt:    btcutil.SatoshiPerBitcoin,
 				Height: 0,
 			},
 		},
@@ -50,7 +50,7 @@ var allowFreeTests = []allowFreeTest{
 		name: "priority == 57,600,000",
 		inputs: []*tx.Utxo{
 			{
-				Amt:    uint64(btcutil.SatoshiPerBitcoin),
+				Amt:    btcutil.SatoshiPerBitcoin,
 				Height: 0,
 			},
 		},
@@ -62,7 +62,7 @@ var allowFreeTests = []allowFreeTest{
 		name: "priority > 57,600,000",
 		inputs: []*tx.Utxo{
 			{
-				Amt:    uint64(btcutil.SatoshiPerBitcoin),
+				Amt:    btcutil.SatoshiPerBitcoin,
 				Height: 0,
 			},
 		},
diff --git a/rpcserver.go b/rpcserver.go
index 01c50c3..39de197 100644
--- a/rpcserver.go
+++ b/rpcserver.go
@@ -1348,7 +1348,7 @@ func GetInfo(icmd btcjson.Cmd) (interface{}, error) {
 	info.KeypoolOldest = time.Now().Unix()
 	info.KeypoolSize = int32(cfg.KeypoolSize)
 	TxFeeIncrement.Lock()
-	info.PaytxFee = float64(TxFeeIncrement.i) / float64(btcutil.SatoshiPerBitcoin)
+	info.PaytxFee = float64(TxFeeIncrement.i) / btcutil.SatoshiPerBitcoin
 	TxFeeIncrement.Unlock()
 	// We don't set the following since they don't make much sense in the
 	// wallet architecture: