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Chimeasure™

Chimney Measurement Toolkit

Recent Jobs

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Tools

Chase Cover

Outside Mount Cap

Fireplace

Liner Calculator

3-2-10 Rule

More Tools

Flue 3D

ChimChat AI

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Customer Name

Job Number

Address

1234 Cool Dr #2026-001

Chase Cover

Precision:

Edit direction:

Left side is fixed. Right side adjusts when you edit.

Collar

—

Side Skirt (in)

Storm Collar

—

Material

Drip Edge

Drip Edge Length (in)

Powder Coat

Shroud

Collar

Storm Collar

Chase Cover Width (in)

Chase Cover Height (in)

Additional Notes

Price Estimator

Material $/sqft

Labor $/unit

Powder Coat $

Markup %

Customer Name

Job Number

Address

Outside Mount

Outside Mount Cap

Precision:

Cap Lid

Lid Overhang (in)

Side Skirt (in)

Screen Height (in)

Mesh Size

Material

Drip Edge

Drip Edge Length (in)

Powder Coat

Width (in)

Height (in)

Additional Notes

Customer Name

Job Number

Address

Fireplace

Fireplace Measurement

Fireplace Opening

Opening Height (in)

Depth of Fireplace (in)

Back Wall & Width

Back Wall Height (in)

Opening Width (in)

Back Wall Width (in)

Mantle, Trim & Hearth

Clearance to Mantle (in)

Clearance to Trim (in)

Hearth Depth (in)

Hearth & Floor

Hearth Width (in)

Fireplace Rise (in)

Top Depth & Flue

Depth at Top of Opening (in)

Flue Size (in)

Smoke Chamber Height (in)

Additional Notes

Flue Size Calculator

Fireplace Opening

Width (in)

Height (in)

Chimney Height (ft) (optional)

Code Ratios

Round flue: min 1/12 of opening area (8.33%)

Square flue: min 1/10 of opening area (10%)

Rectangular (under 2:1): min 1/10 of opening area (10%)

Rectangular (2:1 or more): min 1/8 of opening area (12.5%)

Per IRC R1003.15 / NFPA 211 §11.2.2. Based on minimum chimney height — taller chimneys may allow smaller flues per IRC Table R1003.15.

Rumford Fireplace Sizing

Per IRC R1001.6 Exception. Rumford fireplaces have unique throat and depth requirements. Enter opening size to get Rumford-specific specs.

Opening Width (in)

Opening Height (in)

Buckley Rumford Model Reference

24×27": 8.5×13" or 12×12" tile, 8" round alt

30×30": 12×12" tile, 10" round alt

36×36": 13×13" or 12×16" tile, 12" round alt

42×42": 13×18" or 16×16" tile, 14" round alt

48×48": 16×20" or 18×18" tile, 16" round alt

60×54": 20×20" tile, 18" round alt

72×54": 24×24" tile, 20" round alt

Source: Buckley Rumford Fireplace specifications

Liner Sizing Calculator

Per NFPA 211 §4.1. Size by appliance collar or BTU output. Use 10:1 ratio for chimneys under 25 ft, 12:1 for 25 ft or taller.

Appliance Collar (in)

Chimney Height (ft)

Fuel Type

Liner Material Guide

316Ti / 316L Stainless: Recommended for wood, pellet, coal, and multi-fuel (acidic flue gases)

304 Stainless: Suitable for gas, oil, and wood-only applications

AL29-4C: Premium alloy — all fuel types, lifetime warranty typical

Insulation: Required for solid fuel; recommended for gas/oil to reduce condensation

Ovalization Calculator

Will a round flex liner fit your flue tile? Enter the tile opening and liner size to check.

Flue Tile Width (in)

Flue Tile Depth (in)

Round Liner Size (in)

Insulation Wrap

Common Clay Flue Tile Sizes (nominal → actual inside)

8" × 8"

→ 6.5" × 6.5"

8" × 12"

→ 6.5" × 10.5"

12" × 12"

→ 10.5" × 10.5"

12" × 16"

→ 10.5" × 14.5"

16" × 16"

→ 14.5" × 14.5"

16" × 20"

→ 14.5" × 18.5"

Actual dimensions vary by manufacturer. Always measure the inside opening.

3-2-10 Rule Calculator

Per IRC R1003.9: Chimneys shall extend not less than 3 ft above the highest point where the chimney passes through the roof, and not less than 2 ft higher than any portion of the building within 10 ft (horizontal).

2021 International Residential Code — Chapter 10: Chimneys and Fireplaces. "Any portion of a building" includes ridges, dormers, walls, and other structures — not just the roof surface.

Your Measurements

Chimney Height (ft)

High side of roof to chimney top

Roof Pitch

/ 12

Distance to Ridge (ft) — optional

"Along the roof" = measured with a tape on the shingles

Common Pitches

4/12 — 18.4° — Low slope

6/12 — 26.6° — Standard

8/12 — 33.7° — Moderate steep

10/12 — 39.8° — Steep

12/12 — 45° — Very steep

How to Find Roof Pitch Manually

Method 1: Level + Tape Measure (Most Accurate)

This is the go-to method most pros use. You need a 12-inch level (or any level) and a tape measure.

1. Place the level on the roof surface so one end touches the shingles.

2. Hold it level (bubble centered) — the other end will be floating above the roof.

3. Measure 12 inches along the level from the end touching the roof.

4. At that 12-inch mark, measure straight down to the roof surface.

5. That measurement in inches is your pitch. If it's 6 inches → 6/12 pitch.

Method 2: From the Attic

If you can get in the attic, you can measure the pitch on a rafter without going on the roof.

1. Hold a level against the bottom of a rafter.

2. Measure 12 inches along the level from where it touches the rafter.

3. Measure straight up from that point to the rafter. That's your pitch.

Method 3: Speed Square

A speed square (rafter square) has pitch markings built right in.

1. Place the lip of the speed square on the roof edge or a rafter.

2. Let a plumb bob or level hang from the pivot point.

3. Read the pitch directly off the scale on the square.

Method 4: From the Ground

If you can see the gable end of the house, you can estimate from the ground.

1. Stand back and take a photo of the gable end straight-on.

2. On the photo, measure the horizontal run from the eave to directly below the ridge.

3. Measure the vertical rise from the eave line to the ridge. Divide rise by run and multiply by 12.

Pro Tip

The level method on the roof is the fastest and most accurate. Keep a small torpedo level in your truck — it takes 30 seconds. If you don't have a level, many free phone apps can act as a level too.

Code Reference

2021 IRC R1003.9 — Termination (Masonry Chimneys):
"Chimneys shall extend not less than 2 feet (610 mm) higher than any portion of a building within 10 feet (3048 mm), but shall be not less than 3 feet (914 mm) above the highest point where the chimney passes through the roof."

IRC R1005.1 — Factory-Built Chimneys:
Must be installed and terminated per the manufacturer's installation instructions. Most manufacturers also require the 3-2-10 rule as a minimum.

NFPA 211 — Standard for Chimneys, Fireplaces, Vents:
Also specifies the same 3-2-10 height requirements for solid-fuel appliances.

Disclaimer

This tool is a field reference only. It calculates based on roof slope and does not account for dormers, adjacent structures, second stories, or other building features that may be within the 10-ft horizontal zone. Always verify compliance with local building codes and consult a certified chimney professional or building inspector for final determination. Local jurisdictions may have adopted different editions of the IRC or additional requirements.

Additional Tools

Chimney Cricket Calculator

Per IRC R1003.20: Crickets required when chimney width parallel to ridgeline is more than 30 inches.

Chimney Width (in)

Roof Pitch (/12)

Table R1003.20 — Cricket Height (H) by Roof Slope:
12/12 = 1/2 of W | 8/12 = 1/3 of W | 6/12 = 1/4 of W | 4/12 = 1/6 of W | 3/12 = 1/8 of W

Area Calculator

Calculate square inches for common chimney shapes.

Side Length (inches)

Unit Converter

Convert between inches, feet, millimeters, and centimeters.

From

→

To

Clearances to Combustibles

Quick reference per IRC R1001.11 / R1003.18 and NFPA 211 §7.3, §11.2.

Masonry Fireplace

Front & sides to framing

2"

Back to framing

4"

Trim/mantle from opening

6" min

Projecting mantle (more than 1.5")

12" min from opening

Trim projection rule

1/8" per inch of distance

Masonry Chimney

Interior chimney to combustibles

2"

Exterior-only chimney

1"

Trim/sheathing may abut if

12" from firebox lining

Hearth Extension

Front (under 6 sq ft opening)

16"

Front (6 sq ft or larger)

20"

Sides (under 6 sq ft opening)

8"

Sides (6 sq ft or larger)

12"

Stovepipe / Connectors

Single wall to walls

18"

Single wall to ceiling

18"

Double wall to walls

6"

Double wall to ceiling

8"

Class A chimney pipe

2"

Solid Fuel Appliances

Unlisted stove — sides & back

36"

Unlisted stove — front

36"

Unlisted stove — top to ceiling

48"

Floor protection (legs over 6")

18" all sides

Listed stove — per manufacturer

Check listing

Always check manufacturer specs

Listed appliances may have reduced clearances per their testing. Manufacturer instructions always take precedence. Local codes may differ.

Integrations

Connect Your Tools

Link Chimeasure with your field service software to sync jobs and measurements.

Workiz

Sync jobs & measurements

Not Connected

Paste your Workiz API Token from Settings → Developer API

Support

Need Help?

Send us a message and we'll get back to you by email, usually within a few hours.

Before submitting a ticket — each screen has a How To button at the top with step-by-step instructions. The answer to your question might already be there!

Subject Message

Your Tickets

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Settings

Company

Company Logo

Upload

Appears on inspection reports & emails

Company Name

Company Address

Phone

Email

License / Certification #

Show Logo on Exports

Include your logo on PDFs and image exports

Personnel & Reports

Tech Name

Role

State / Jurisdiction

Building Type

Default Inspection Level

Default Repair Timeframe

Report Footer / Disclaimer

Tool Defaults

Material

Side Skirt (inches)

Collar Size (inches)

Drip Edge

Drip Edge Length (inches)

Precision

Measurement Mode

Material

Default Mode

Side Skirt (inches)

Lid Overhang (inches)

Screen Height (inches)

Mesh Size

Drip Edge

Drip Edge Length (inches)

Default Damper Type

Default Sizing Mode

Default Fuel Type

Default Ridge Distance Mode

Bottom Tab Bar

Data

More

Use System Theme

Push Notifications

Haptic Feedback

ChimSuite v1.0 · ChimEasure + ChimChat

Items

1234 Cool Dr #2026-001

Additional Notes:

Outside Mount

Additional Notes:

Fireplace

Measurements:

Flue Size Calculator

Fireplace Opening

Liner / Flue Size

Code Ratios

Rumford Fireplace Sizing

Liner Sizing Calculator

Ovalization Calculator

3-2-10 Rule Calculator

Your Measurements

Common Pitches

How to Find Roof Pitch Manually

Code Reference

Additional Tools

Chimney Cricket Calculator

Area Calculator

Unit Converter

Clearances to Combustibles

Connect Your Tools

Need Help?

Your Tickets

Double-check your measurements

ChiMeasure — Insert Finder