diff --git a/core/loadpoint_session.go b/core/loadpoint_session.go
index d30315ab852..bc112604dd1 100644
--- a/core/loadpoint_session.go
+++ b/core/loadpoint_session.go
@@ -2,6 +2,7 @@ package core
 
 import (
 	"errors"
+	"math"
 	"time"
 
 	"github.com/evcc-io/evcc/api"
@@ -12,6 +13,20 @@ import (
 	"github.com/jinzhu/now"
 )
 
+func roundFloat64(value float64, digits int) float64 {
+	factor := math.Pow10(digits)
+	return math.Round(value*factor) / factor
+}
+
+func roundFloat64Ptr(value *float64, digits int) *float64 {
+	if value == nil {
+		return nil
+	}
+
+	rounded := roundFloat64(*value, digits)
+	return &rounded
+}
+
 func (lp *Loadpoint) chargeMeterTotal() float64 {
 	m, ok := api.Cap[api.MeterEnergy](lp.chargeMeter)
 	if !ok {
@@ -55,7 +70,9 @@ func (lp *Loadpoint) createSession() {
 
 	if lp.site != nil {
 		lp.session.ReferencePricePerKWh = tariff.AverageRate(lp.site.GetTariff(api.TariffUsageGrid), 24*time.Hour)
-		lp.session.ReferenceCo2PerKWh = tariff.AverageRate(lp.site.GetTariff(api.TariffUsageCo2), 24*time.Hour)
+		lp.session.ReferenceCo2PerKWh = roundFloat64Ptr(
+			tariff.AverageRate(lp.site.GetTariff(api.TariffUsageCo2), 24*time.Hour), 4,
+		)
 	}
 
 	// energy
@@ -71,10 +88,11 @@ func (lp *Loadpoint) applyEnergyMetrics(s *session.Session) {
 	}
 
 	s.SolarPercentage = new(lp.energyMetrics.SolarPercentage())
+	s.SolarPercentage = roundFloat64Ptr(s.SolarPercentage, 4)
 	s.Price = lp.energyMetrics.Price()
-	s.PricePerKWh = lp.energyMetrics.PricePerKWh()
-	s.Co2PerKWh = lp.energyMetrics.Co2PerKWh()
-	s.ChargedEnergy = lp.energyMetrics.TotalWh() / 1e3
+	s.PricePerKWh = roundFloat64Ptr(lp.energyMetrics.PricePerKWh(), 5)
+	s.Co2PerKWh = roundFloat64Ptr(lp.energyMetrics.Co2PerKWh(), 4)
+	s.ChargedEnergy = roundFloat64(lp.energyMetrics.TotalWh()/1e3, 5)
 
 	lp.db.Persist(s)
 }
diff --git a/core/session/db.go b/core/session/db.go
index ab21ff624da..5bed61121b3 100644
--- a/core/session/db.go
+++ b/core/session/db.go
@@ -1,6 +1,8 @@
 package session
 
 import (
+	"math"
+
 	"github.com/evcc-io/evcc/server/db"
 	"github.com/evcc-io/evcc/util"
 	"gorm.io/gorm"
@@ -88,7 +90,7 @@ func (s *DB) ClosePendingSessionsInHistory(chargeMeterTotal float64) error {
 		}
 
 		if session.MeterStart != nil && session.MeterStop != nil {
-			session.ChargedEnergy = *session.MeterStop - *session.MeterStart
+			session.ChargedEnergy = math.Round((*session.MeterStop-*session.MeterStart)*1e5) / 1e5
 			s.Persist(session)
 		}
 	}