Twenty centimeters of snow equals 7.87 inches of snow depth.
Need a fast metric-to-imperial check for winter plans? Here’s the plain answer with context, a reliable formula, and field-tested tips so you can measure and report snowfall the same way weather pros do.
How Much Snow Is 20 Cm In Inches? Methods And Formula
The inch is defined as exactly 2.54 centimeters by national standards labs. That fixed link means your conversion is precise and repeatable across tools.
inches = centimeters ÷ 2.54
Applying it here: 20 ÷ 2.54 = 7.874…, which rounds to 7.87 inches. For public notes, two decimals read cleanly. If you must use a one-decimal style, 7.9 inches works. If your template prefers common fractions, 7 3/4 inches is the closest quarter-inch.
| Centimeters | Inches | Handy Notes |
|---|---|---|
| 12 cm | 4.72 in | Shovel dusting |
| 15 cm | 5.91 in | Boot-sole depth |
| 18 cm | 7.09 in | Driveway pass needed |
| 20 cm | 7.87 in | Target value |
| 22 cm | 8.66 in | Plow berms form |
| 25 cm | 9.84 in | Near a “ten-inch day” |
| 30 cm | 11.81 in | Just under a foot |
20 Cm Of Snow To Inches Conversion — Simple Steps
Use The Exact Definition
The fixed inch-centimeter relationship prevents drift between calculators. If two sites show tiny differences, that’s rounding, not a new rule.
Run The Math Cleanly
- Write the depth in centimeters: 20.
- Divide by 2.54.
- Round to the precision your report needs.
People often ask, “how much snow is 20 cm in inches?” because road alerts, power updates, and ski reports in the U.S. list new snow in inches.
Measure Snow The Same Way The Pros Do
To get a trustworthy number to convert, measure snow depth on a flat, level surface, not on grass clumps or drift peaks. Use a snow board (a 16×16-inch white board) or a patio table kept clear between storms. Take several readings in your yard and average them. Clear and reset your board after each official report window.
Weather offices ask observers to report the greatest accumulation since the last observation, in inches and tenths. That method avoids under-reporting after settling or melting. If you don’t have a snow board, pick an open spot that represents the area and use the same site each time for consistency.
Simple Field Checklist
- Place the board in an open area away from trees, walls, and snow blowers.
- Insert a ruler straight down to the board; read to the nearest tenth of an inch.
- Take at least three samples; average them for your yard’s number.
- When wind piles drifts, ignore the tallest drifts and the scoured patches; use the representative open area.
Worked Examples You Can Copy
Convert 20 Cm, 25 Cm, And 30 Cm
20 cm → 7.87 in: 20 ÷ 2.54 = 7.874… → 7.87.
25 cm → 9.84 in: 25 ÷ 2.54 = 9.842… → 9.84.
30 cm → 11.81 in: 30 ÷ 2.54 = 11.811… → 11.81.
Convert Back From Inches To Cm
8 in → 20.32 cm: 8 × 2.54 = 20.32, so an “eight-inch” report is a hair more than 20 cm.
10 in → 25.40 cm: That’s the crisp “ten-inch day” many ski areas post.
Mental Math Tricks For Fast Calls
- Divide by 2.5, then shave 1%: 20 ÷ 2.5 = 8; trimming 1% lands near 7.92. Close enough for a quick radio call; you can tighten later.
- Use 0.4 inches per centimeter: Multiply 20 by 0.4 → 8, then subtract a touch (about 0.13) to reach 7.87.
- Know the anchors: 5 cm ≈ 2 in, 10 cm ≈ 4 in, 25 cm ≈ 10 in, 30 cm ≈ 12 in.
Common Mistakes That Skew The Number
- Measuring on grass: Blades hold snow above ground, inflating shallow totals.
- Reading drift peaks: Wind stacks fluff; stick with open, level spots.
- Waiting too long: Settling reduces depth. If the burst is over, measure now, then clear the board.
- Switching sites: A patio table today and the lawn tomorrow will add noise to your log.
Snow Depth Vs. Snow Water — Why The Number Can “Feel” Different
Snow depth is a space-filling measure. Water content is a weight measure. A light, feathery storm can stack 20 cm with little water, while a wet spring storm can drop the same 20 cm with far more water load. Forecasters describe this with a snow-to-liquid ratio (SLR). The old rule of thumb is 10:1, yet the real value swings with temperature, moisture, and crystal type.
Quick Reference: Formulas You Can Trust
Centimeters To Inches
in = cm ÷ 2.54
Inches To Centimeters
cm = in × 2.54
Both equations come from the exact link between the two units. That exactness is why every quality converter returns the same 7.87 inches for 20 cm.
Rounding, Reporting, And When To Convert Back
Public dashboards often list snowfall in inches to one decimal. If your original notes are in centimeters, round the converted value to two decimals first, then trim to one if needed. Keep the unrounded math in your notebook for audits or insurance forms. If your audience works in metric, give both units in the same line so no one has to recalc.
Clean Notation That Reads Well
- Primary unit first, alternate in parentheses: 20 cm (7.87 in).
- Stay consistent with symbols: cm, in.
- Avoid mixing “ and in on the same line; pick one style.
Applying SLR To Real-World Planning
Depth alone doesn’t tell the whole story for weight on a roof, water for runoff, or avalanche risk. SLR gives a fast sense of how fluffy or wet that 20 cm really is. Pair your depth with a rough SLR band from the forecast to plan gear, plowing, or travel windows.
| Snow Type | Typical SLR | Approx. Water From 20 Cm |
|---|---|---|
| Wet spring | 5:1–8:1 | 25–40 mm (1.0–1.6 in) liquid |
| Average mid-lat | 10:1–12:1 | 17–20 mm (0.7–0.8 in) liquid |
| Powder | 15:1–20:1 | 10–13 mm (0.4–0.5 in) liquid |
| Arctic fluff | 25:1+ | ≤8 mm (≤0.3 in) liquid |
Where The Standards Come From
The inch-centimeter link is set in national standards publications. The snow measurement method used by U.S. weather offices outlines how to place a board, when to read, and how to report in tenths of an inch. Those two anchors—the unit definition and the measurement routine—make your converted number defensible in reports, permits, and local alerts.
Why So Many Snow Maps Use Inches
North American road crews, plow contracts, and ski areas set thresholds in inches. That’s why apps and TV maps for the U.S. and parts of Canada default to inches. Even if your yardstick is metric, translating 20 cm to 7.87 inches helps you match those notices, choose the right plow setting, and read lift reports without guessing.
Science groups log metric data behind the scenes, yet public bulletins stick with inches to match long-running policies and signage. Giving both units keeps everyone on the same page.
Make A Low-Cost Snow Board
You can build a board from scrap in minutes. Cut a square of light-colored plywood about 40 cm on a side, paint it white, and set it flush on the lawn before the season starts. Mark the spot with a stake so you can find it after the first burst. The white surface reduces melt from sunlight, which keeps your depth closer to reality during long events.
- Cut a square board (about 16 in by 16 in works well).
- Paint it white and let it dry.
- Place it in an open area with level ground.
- Log each reading and brush it clean after you report.
Rounding Rules Used In Public Reports
Many weather offices ask for tenths of an inch for new snow, and whole inches for storm totals, with notes for times and mixed precipitation. Media dashboards often round to one decimal so the feed stays readable. If your measured value is exactly 20 cm, two clean options are 7.87 in or 7.9 in. If your meter shows 19.8 cm after settling, convert the observed depth rather than the forecast value you expected.
Edge Cases: Sleet, Ice Crust, And Compaction
Sleet and graupel: Pellets pack tighter than dendrites. Depth can run lower for the same water load. Convert the measured depth, and if water weight matters, include a rough SLR band.
Freezing rain: Glaze doesn’t count as “snowfall” depth. If ice coats your board, move to a fresh spot or clear the board, then resume snowfall readings after the mix ends.
Compaction during long events: Heavy bands weigh down the lower layers. That’s why the greatest accumulation since the last observation is used. Take a reading when the burst ends, log it, clear the board, and continue.
Link Out To The Official Rules
See the national standards note that the inch equals exactly 2.54 centimeters (conversion factors) and the weather service guide on measuring snowfall. Both are plain, actionable pages.
Use The Exact Phrase When You Need It
When posting to a local snow forum or submitting a spotter note, write: “New snow: 20 cm (7.87 in).” That direct format pins the answer for anyone still asking, “how much snow is 20 cm in inches?”.