The Northern
Logger App

Calculators, converters & reference tools for logging and forest products professionals.

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Put your organization's name on a mobile field tool built for the logging and forest products industry. Choose any or all of the calculators in this app — delivered under your brand, in your colors, on your domain.

Single license

Your branding, domain, and contact information.

From $2,500

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Wood

Log volumes

Board feet by log rule

›

Log rule

Log length

feet

Small-end diameter (inside bark)

inches

—

board feet

Rule

Doyle

MBF

—

Doyle: (D−4)²×L/16 | Scribner Decimal C tables | International ¼" formula | Vermont rule

Log rule prices

Compare two rules & values

›

Log length

feet

Small-end diameter

inches

Rule 1

$ /MBF

Rule 2

$ /MBF

Rule	BF	MBF	Log value

Cord weight

Calculate cordwood weight in tons

›

Species

Number of cords

cords

—

tons

Tons/cord

—

Lbs/cord

—

Lumber tally

Summarize board foot totals

›

Lumber thickness

Enter number of boards for each dimension

Length	2"	4"	6"	8"	10"	12"

0

board feet

BF = Thickness (in) × Width (in) × Length (ft) ÷ 12

Split firewood loads

Thrown load size in cords

›

Firewood length

Box length

feet

Box width

feet

Box height

feet

—

cords in load

Source: State of Maine Thrown Cord Firewood Study

Cubic volumes

Convert cubic feet, cords & cunits

›

Enter amount

Units

Unit	Value

1 rough cord = 90 cu ft | 1 peeled cord ≈ 79 cu ft | 1 cunit = 100 cu ft

Log rule conversions

Convert between rules by diameter class

›

From rule

To rule

Diameter range

Volume (MBF, original rule)

—

MBF converted

Conversion factors are approximate and vary by diameter. Differences between log rules are not linear.

Forests

Timber volumes, growth, stems & more

7 forest calculators

›

Roads & BMPs

Culverts, bridges, drainage & more

7 road & BMP calculators

›

Finance

Loan comparison & retirement savings

2 finance calculators

›

Productivity

Forwarder & grapple skidder

2 productivity calculators

›

Northeastern Loggers' Association

This app is brought to you in partnership with

Northeastern Loggers' Association

NELA represents nearly 2,000 members of the Northeast and Lake States' logging and forest products community. Publisher of The Northern Logger & Timber Processor since 1952 — and the home base of the Northeastern Forest Products Equipment Exposition.

northernlogger.com

News, membership & resources

↗

Contact Kristin Armendola

Executive Director · kristin@northernlogger.com

↗

Call NELA

(315) 369-3078 · PO Box 69, Old Forge, NY

↗

Forests

Timber volumes per acre

MBF by size class — FC 78

›

Log rule

Size class

Basal area per acre (sq ft)

sq ft/ac

Average height (16-ft logs)

—

MBF per acre

Form Class 78 — add/subtract 3% per FC unit above or below 78.
Source: Bick's Northern Tree, Timber and Woody Biomass Volume Tables

Timber tons per acre

Whole-tree biomass by species type

›

Species type

Basal area per acre (sq ft)

sq ft/ac

Total tree height

Truck load size

tons

—

tons per acre

Loads/acre

—

Source: Douglas Montieth's Whole Tree Weight Tables for New York

Tree growth rates

Annual diameter increment from rings

›

Tree DBH (inches)

inches

Growth rings per inch

rings/in

—

inches diameter growth per year

Years to current DBH

—

Gain in 10 years

—

Growth rates can be applied to BA, cords, tons, MBF etc. by multiplying rate × good stock.
Source: Burl Ashley's USFS Reference Handbook for Foresters

Stems per acre

Estimate tree stems from BA & DBH

›

Basal area per acre (sq ft)

sq ft/ac

Average DBH (inches)

inches

—

trees per acre

Source: Burl Ashley's USFS Reference Handbook for Foresters

Plantation trees

Trees required for planting

›

Number of acres

acres

Row spacing (feet)

feet

Tree spacing in row (feet)

feet

—

trees required

Trees/acre

—

Spacing

—

Seedling spacing

Spacing from tree count & acreage

›

Number of acres

acres

Number of trees

trees

—

feet spacing (square)

Trees/acre

—

Roads & BMPs

BMP drainage spacing

Skid trail grade → structure spacing

›

Trail grade (% slope)

During logging

—

feet apart

After logging

—

feet apart

Source: Vermont Water Quality Acceptable Management Practices for Logging Professionals

Culvert sizing — temporary

Drainage area → culvert diameter

›

Drainage area (acres)

acres

—

inches — temporary culvert

Source: Vermont Water Quality Acceptable Management Practices for Logging Professionals

Culvert sizing — permanent

Drainage area → culvert diameter

›

Drainage area (acres)

acres

—

inches — permanent culvert

Source: Vermont Water Quality Acceptable Management Practices for Logging Professionals

Temporary bridge spans

Drainage area → minimum span

›

Drainage area (acres)

acres

—

feet — minimum span between abutments

Source: Vermont Water Quality Acceptable Management Practices for Logging Professionals

Culvert equivalents

Smaller culverts to equal a larger one

›

Larger culvert (inches)

Smaller culvert (inches)

—

smaller culverts needed

Always round up — you cannot round down. Based on cross-sectional area comparison.

Mulch & seed

Bales and seed needed by area

›

Seeding option

Land area (square feet)

sq ft

Bales needed

—

Seed (lbs)

—

Source: Vermont Water Quality Acceptable Management Practices for Logging Professionals

Gravel & roads

Cubic yards, loads & tons

›

Width (feet)

Depth (inches)

Length (feet)

feet

Truck load size (cubic yards)

cu yd

Tons per cubic yard

t/cu yd

Measure	Value

Finance

Loan comparison

Compare two loan options side-by-side

›

Option 1

Amount ($)

Rate (%)

Term (years)

Payments/year

Option 2

Amount ($)

Rate (%)

Term (years)

Payments/year

	Option 1	Option 2

Retirement savings

Project your nest egg at retirement

›

Current age

Retirement age

Current savings ($)

Annual savings ($)

Rate of return (%)

—

projected value at retirement

Years to retire

—

Total contributions

—

Productivity

Forwarder productivity

Truck loads per machine hour

›

Truck load size (tons)

tons

Forwarder load size (tons)

tons

Cycle time (minutes)

min

—

truck loads per machine hour

Machine hrs/truck load

—

System productivity is determined by the output of the entire system, not a single machine.

Grapple skidder productivity

Truck loads per machine hour

›

Truck load size (tons)

tons

Bunch / hitch size (tons)

tons

Cycle time (minutes)

min

—

truck loads per machine hour

Machine hrs/truck load

—

System productivity is determined by the output of the entire system, not a single machine.

About

About this app

The Northern Logger App is a mobile field tool for logging and forest products professionals, providing calculators and converters for wood measurement, forest assessment, road building, equipment productivity and business finance.

The app was designed and compiled by Dr. Steven Bick of Northeast Forests, LLC, with the help and suggestions of many forest industry reviewers. Development was supported in part by the Vermont Department of Forest, Parks and Recreation, a USDA Forest Service Landscape Scale Restoration Grant, a Farm Credit East AgEnhancement Grant, the Northeastern Logger's Association and Northeast Forests, LLC.

This app should be used for informational purposes only. No guarantees are made for the accuracy of any calculation, conversion or reference herein.

Get your own app

Put your organization's name on a mobile field tool like this one. Choose any or all of the calculators — your branding, your colors, your domain.

From $2,500 for a single organization license.

Start a conversation ↗

This app is brought to you in partnership with

Northeastern Loggers'
Association

NELA · Old Forge, NY · Founded 1952

NELA is a regional trade group representing nearly 2,000 members of the Northeast and Lake States' logging, sawmilling, and forest products community. NELA advocates wise stewardship of forest resources and develops programs — including safety training, logger certification, and policy advocacy — that strengthen the industry as a whole.

📰

The Northern Logger & Timber Processor

NELA's monthly magazine — covering the Northeast and Lake States forest products industry for over 60 years.

Visit northernlogger.com

News, articles & resources

↗

Join NELA

Membership information

↗

NELA store

Books, publications & gear

↗

Executive Director

Kristin Armendola

kristin@northernlogger.com ↗

(315) 369-3078

PO Box 69, Old Forge, NY

More resources

For more useful programs and calculators, visit loggingchance.com ↗

For forest business tools and programs, visit forestenterprise.org ↗ and lumbermen.org ↗

In accordance with Federal law and U.S. Department of Agriculture policy, this institution is prohibited from discriminating on the basis of race, color, national origin, sex, age, or disability. (Not all prohibited bases apply to all programs.)
To file a complaint of discrimination, write USDA, Director, Office of Civil Rights, Room 326-W, Whitten Building, 1400 Independence Avenue, SW, Washington, DC 20250-9410 or call (202) 720-5964 (voice and TDD). USDA is an equal opportunity provider and employer.

Northeast Forests, LLC · Moretown, VT

steve@northeastforests.com

The NorthernLogger App

Northeastern Loggers' Association

Forests

Roads & BMPs

Finance

Productivity

About

About this app

Get your own app

Northeastern Loggers'Association

More resources

The Northern
Logger App

Northeastern Loggers'
Association