Dexcom
Dexcom ONE+
As of August 2026 we track 8 continuous glucose monitors available here, and the cheapest one you can buy without a prescription is the FreeStyle Libre 2 Plus at about £103.98 a month.
Specifications
| Wear time | 10 days |
|---|---|
| Warm-up | 30 minutes |
| Accuracy (MARD) | Not published |
| Readings | every 5 min |
| Alarms | Yes |
| Prescription | Not required |
What does the accuracy figure mean?
MARD is the average gap between what the sensor says and what a laboratory blood test says, as a percentage. A 10% MARD means readings are off by about 10% on average — so a true 7.0 mmol/L might show as anywhere around 6.3 to 7.7. Lower is better. Most current sensors sit under 10%; twenty years ago they were over 20%. No sensor is exact, which is why treatment decisions still get confirmed with a fingerstick when a reading does not match how you feel.
Pricing
£35.00
to try · 10 days
£1,277.50
per year
- per sensor · 10 days
- £35.00
- per month
- Not published
excludes VAT
The least you can spend to wear one sensor for its full life. For subscription products it is one month, because you cannot buy less.
Estimated from the sensor price and its wear time, assuming continuous use.
Prices last checked: 2026-08-05
What works well
- The cheapest sensor here that has high and low alarms, at £35 a sensor
- Twelve-hour grace period after the ten days, so a late replacement does not leave you blind
- Thirty-minute warm-up, the same as the G7
What to watch out for
- Ten-day wear means about 36 sensors a year, so the low sensor price is less of a saving than it looks
- Fewer integrations than the G7 — no pump interoperability
- No published accuracy study of its own
Our verdict
Dexcom’s value sensor, and the cheapest route to alarms we have found. Worth comparing on yearly cost rather than sensor price, because ten-day wear closes most of the gap to the fifteen-day Abbott sensors.
Common questions
- How long does a Dexcom ONE+ sensor last?
- Up to 10 days, plus a 12-hour grace period before it stops reading.
- What is the difference between Dexcom ONE+ and the G7?
- Similar sensor hardware and wear time, but ONE+ costs less and leaves out the G7’s pump interoperability and some sharing features.