TrendArcTrendArc
TrendArc Guides

How to Analyze RingConn Data in Excel — and the 10-Second Alternative

The RingConn export gives you clean CSVs (here's how to get them), and Excel or Google Sheets will happily open them. The catch is that raw daily numbers answer the wrong question. "What was my HRV yesterday?" is noise. "Has my HRV moved over the last two months?" is signal. Here's how to get signal out of a spreadsheet — and what to use if you'd rather not build it yourself.

Step 1: Get the data into one sheet

  1. Unzip the export. Open Vital Signs — it has the date column plus heart rate, HRV, and SpO2.
  2. Sleep values live in the Sleep CSV and are in minutes — add a column dividing by 60 if you want hours.
  3. If you want everything in one table, match rows by the date column (VLOOKUP or just paste side-by-side — the exports share the same date keys).

Step 2: The three formulas that actually matter

Trend (window vs window). Don't eyeball the chart — compare two consecutive windows. With dates in column A and HRV in column B:

=AVERAGEIFS(B:B, A:A, ">="&TODAY()-60) / AVERAGEIFS(B:B, A:A, ">="&TODAY()-120, A:A, "<"&TODAY()-60) - 1

That's "last 60 days vs the 60 before, as a percentage." A move of ±5% or more between windows is worth believing. Less than that is usually noise.

Personal baseline. Your normal range, not the internet's: mean ± standard deviation over a trailing window:

=AVERAGE(B2:B61) and =STDEV.S(B2:B61)

A day outside mean ± 1 SD is unusual for you. That beats comparing yourself to population charts.

Weekday pattern. Add a column =TEXT(A2,"ddd"), then pivot (or AVERAGEIF) sleep hours by day name. Weekday-vs-weekend sleep gaps — social jet lag — hide in plain sight in daily views.

The traps: blank days (ring off, charging) silently shrink your AVERAGEIFS windows; sleep minutes masquerade as impossible hour counts; and a 7-day "trend" is almost always noise — HRV and resting HR move on the scale of weeks, not days.

Step 3: Interpret like a skeptic

The 10-second alternative

Everything above — windowed trends, personal baselines, weekday splits, plus things that are genuinely painful in a spreadsheet (sleep-stage composition over time, tagged-day comparisons with minimum sample sizes, best-stretch detection) — is what TrendArc computes automatically when you drop the export ZIP into your browser. Same math, zero formulas, and the data never leaves your device: no account, no upload, no server.

Skip the formulas — see the demo
TrendArc reads your RingConn ZIP entirely in your browser and turns months of data into long-term trends and plain-English insights. The trend charts are free. Try it on sample data first; no ring required.
Open the demo →