Calculator

These calculations will help you determine the square footage for the proper amount of stain and prepping supplies needed to refinish your deck or fence using TWP 100 or TWP 1500 Series.

This is intended to provide you with an approximate estimate only. Material requirements may vary according to application method, surface condition, and weather conditions.

Prepping Options

  • Gemini Restore Kit. This will be used for new, gray, dirty decks and for applying TWP over an intact older coating of TWP.
  • Restore-A-Deck Stripper and Restore-A-Deck Brightener. This is used for removing old coatings of stain. Use this if you are switching from a different brand to TWP or if you have a neglected coating of TWP that has failed unevenly.

Deck Sq. Footage

Flooring Length x width =?

Railing Length x height =?

Steps Width x Depth x #of Steps =?

Add up all 3 for the Total Sq. footage.

Fence Sq. Footage

Length x height =?

Multiply x 2 for both sides = Total Sq. Footage

If you have questions, please ask below.

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  • We will reply to your comment shortly
    Ernest Covington · 09/08/2015
    How much TWP 1500 needed for 888 sq. ft.(74 linear foot of 6 foot pickets, both sides) of untreated cedar fence?

    Fence installed 5/2013

    Denver, Colorado weather
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    TWP Stains · 09/06/2015
    Rob C.:
    I HAVE AN OLDER REDWOOD DECK..last stained with Cabot redwood decking stain 5 yrs. ago. Would like to use TWP 1500 (redwood)this time... please advise on prepping, etc.

    You will need to remove the Cabot stain first. How depends on the type of Cabot that it is. Do you know if it is a solid or semi-transaparent? If semi-transparent then you should use the Restore A Deck Stain Stripper and pressure washer to remove. Follow this with the Restore A Deck Brightener.
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    Rob C. · 09/05/2015
    I HAVE AN OLDER REDWOOD DECK..last stained with Cabot redwood decking stain 5 yrs. ago. Would like to use TWP 1500 (redwood)this time... please advise on prepping, etc.
  • We will reply to your comment shortly
    TWP Stains · 09/04/2015
    eaerhard:
    I have a new treated wood deck, the last section has about 3 months of very dry weather and 8-10 hours of full sun exposure dry time on it. The rest has been 4-12 months of dry time. I am using the Restore-a-Deck 2 step kit to prep for stain but not sure on the amount of stain to buy to cover the 375-400 sq ft. I used the calculator but not sure if that is providing 2 coat coverage or one for a new deck as you recommend elsewhere on your site. Can you give me a better idea of how much to purchase for the initial staining?

    2-3 gallons will cover for the first coat on the deck.
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    Eric Erhard · 09/03/2015
    I have a new treated wood deck, the last section has about 3 months of very dry weather and 8-10 hours of full sun exposure dry time on it. The rest has been 4-12 months of dry time. I am using the Restore-a-Deck 2 step kit to prep for stain but not sure on the amount of stain to buy to cover the 375-400 sq ft. I used the calculator but not sure if that is providing 2 coat coverage or one for a new deck as you recommend elsewhere on your site. Can you give me a better idea of how much to purchase for the initial staining?
  • We will reply to your comment shortly
    TWP Stains · 09/02/2015
    kmf:
    HI
    we are replacing t&g mahogany decking boards that have rotted out then refinishing remaining decking.
    would like to sand off spar finish and apply 1500 series to entire porch deck.
    porch id covered 600 sqft.
    please advise regards Kevin

    You would need about 5 gallons for 2 coats of the TWP. If you only do one coat then you would about 3-4 gallons.
  • We will reply to your comment shortly
    kmf · 09/02/2015
    HI
    we are replacing t&g mahogany decking boards that have rotted out then refinishing remaining decking.
    would like to sand off spar finish and apply 1500 series to entire porch deck.
    porch id covered 600 sqft.
    please advise regards Kevin
  • We will reply to your comment shortly
    TWP Stains · 08/30/2015
    mike gumbinger:
    I have a deck that is just 5 months old and it is recommended to just put one coat one after I clean it. How long will the 1501 last if I purchase 5 gallons?

    http://www.twpstainhelp.com/shelf-life-of-twp/
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    mike gumbinger · 08/29/2015
    I have a deck that is just 5 months old and it is recommended to just put one coat one after I clean it. How long will the 1501 last if I purchase 5 gallons?
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    TWP Stains · 08/13/2015
    kpmullins:
    I am planning on staining a new fence. How long should I wait to stain and do I need to do any prep prior to using your product to stain?

    Is the fence wood rough cut? If so you can stain right away with no prep as long as it is dry. If the wood is smooth then you will need to wait. See here:
    http://www.twpstainhelp.com/prepping-new-wood-for-twp-stains/
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    kpmullins · 08/12/2015
    I am planning on staining a new fence. How long should I wait to stain and do I need to do any prep prior to using your product to stain?
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    TWP Stains · 08/12/2015
    Nancytodd:
    I received a sample of your deck stain and really like the color. My deck will require two coats of stain. The deck is 600 sq ft. and will need two coats. It is your 1500 series. Can this stain be used for staining trim of the cedar home as well as the deck? Should the underside of the deck be stained as well as the top, rails and spindles?

    Only exposed wood should be stained so no need for the undersides. You can use the TWP for the trim as long as the wood is unfinished.
  • We will reply to your comment shortly
    Nancytodd · 08/11/2015
    I received a sample of your deck stain and really like the color. My deck will require two coats of stain. The deck is 600 sq ft. and will need two coats. It is your 1500 series. Can this stain be used for staining trim of the cedar home as well as the deck? Should the underside of the deck be stained as well as the top, rails and spindles?
  • We will reply to your comment shortly
    TWP Stains · 08/07/2015
    Hal Waite:
    I purchased 5 gallons of 1500 clear and applied one coat this summer to my 1 yr old pressure treated deck after allowing it to dry for 1 yr. My deck faces east northeast and is sun from sunrise to 4pm. I realize I want UV protection. Can I use 1501 for the second coat and expect good UV protection?

    Also installed a cedar fence a month ago around the pool same sun light issue. which production can I use twp 100 or twp 1500?

    You can only use the 1500 Series for NY. You cannot apply the 1501 Cedartone over the clear now. Best to prep well and apply it next Spring so it will properly take.
  • We will reply to your comment shortly
    Hal Waite · 08/06/2015
    I purchased 5 gallons of 1500 clear and applied one coat this summer to my 1 yr old pressure treated deck after allowing it to dry for 1 yr. My deck faces east northeast and is sun from sunrise to 4pm. I realize I want UV protection. Can I use 1501 for the second coat and expect good UV protection?

    Also installed a cedar fence a month ago around the pool same sun light issue. which production can I use twp 100 or twp 1500?
  • We will reply to your comment shortly
    TWP Stains · 08/06/2015
    Phil Sprute:
    i have a 3600 sqft cedar shake roof in the Seattle area. How many gallons of the cedar tone TWP do I need)

    25-35 gallons depend on how porous the roof is and the application method.
  • We will reply to your comment shortly
    Phil Sprute · 08/05/2015
    i have a 3600 sqft cedar shake roof in the Seattle area. How many gallons of the cedar tone TWP do I need)
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    TWP Stains · 08/05/2015
    Linda Pierce:
    I have a 1622 square foot pine 2 x 6 deck. We put Ace brand oil based stain on it when we first put the deck up two years ago and the stain did not take.. we left it so now have graying wood along with some mold and some remaining stained areas. We live in a desert climate.. low humidity with high heat and lots of sun.. and cold winters. I would like to put two coats on this time around.. what will we need?? thanks..

    Prep first to remove all old Ace stain with the Restore A Deck Stripper and pressure washing. Brighten the wood after the stripping. Apply two light coats of the TWP with the "wet on wet" method.

    3-4 of the RAD Stain Strippers
    2 of the RAD Brighteners
    About 15 gallons of stain give or take a couple of gallons as it varies on your wood and application method.
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    TWP Stains · 08/05/2015
    Charles Roedersheime:
    In using your calculator to estimate number of gallons of stain needed, I noted there was no provision for ballisters or posts for deck rails nor indication of whether the rail length would cover both cap rail and bottom rail. Also our deck has inside and outside cap and top rails to connect the ballisters. Our deck has whether the rail measurement was to include the . Our deck railings have square spindles every 3 inches plus 4 by 4 post that will be stained.The The posts are the hiegth of the rail plus 4 inches to the deck. Also our deck has a wooden grating at its base (it is elevated)and the grating is a lattice design with the 1 inch square connectors spaced about 1 inch apart. Measured the average height and length of the grating and divided in half to estimate stain needed.
    Suggestions on calculating the parts of the deck not included in measurement and method to average out the stain amount required for the grating.

    The railing height x the length covers all parts of the railings including spindles, caps, posts etc. Just do a sq. footage calculation for the lattice.
  • We will reply to your comment shortly
    Charles Roedersheime · 08/04/2015
    In using your calculator to estimate number of gallons of stain needed, I noted there was no provision for ballisters or posts for deck rails nor indication of whether the rail length would cover both cap rail and bottom rail. Also our deck has inside and outside cap and top rails to connect the ballisters. Our deck has whether the rail measurement was to include the . Our deck railings have square spindles every 3 inches plus 4 by 4 post that will be stained.The The posts are the hiegth of the rail plus 4 inches to the deck. Also our deck has a wooden grating at its base (it is elevated)and the grating is a lattice design with the 1 inch square connectors spaced about 1 inch apart. Measured the average height and length of the grating and divided in half to estimate stain needed.
    Suggestions on calculating the parts of the deck not included in measurement and method to average out the stain amount required for the grating.