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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    TWP Stains · 08/15/2016
    kinge17:
    I have a 4 month old cedar fence, 208 linear feet by 6 ft tall. trying to figure out amount needed and once done if it needs to be sealed with a product such as thompsons also i assume the wet on wet means to apply second coat immediately

    Are you doing both sides? If so you have about 2400 sq. feet. You will need two coats applied wet on wet. About 20-25 gallons total. You do not seal over the TWP after. No need to.
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    TWP Stains · 08/14/2016
    Michael Lee:
    I want the natural graying process to show on my cedar deck. Do you offer a clear product for penetrating and water proofing a deck (understanding there would not be UV protection)

    Yes, both the 100 and the 1500 come in a clear.
  • We will reply to your comment shortly
    Michael Lee · 08/14/2016
    I want the natural graying process to show on my cedar deck. Do you offer a clear product for penetrating and water proofing a deck (understanding there would not be UV protection)
  • We will reply to your comment shortly
    TWP Stains · 08/06/2016
    Hilde Morin:
    I power washed, sanded my deck and plan to use TWP 100 series. Do I use the Cleaner/Brightener and then stain?
    Thank you!

    Yes that would be correct.
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    Hilde Morin · 08/05/2016
    I power washed, sanded my deck and plan to use TWP 100 series. Do I use the Cleaner/Brightener and then stain?
    Thank you!
  • We will reply to your comment shortly
    TWP Stains · 07/31/2016
    Cheri Brown:
    I applied TWP 1500 to a new deck three years ago. It's time to reapply stain. The total square footage of the deck is 1,397. Could you tell me how much stain I will need to purchase and if any prep is necessary outside of power washing

    Yes you need to prep with the Gemini Restore Kit with the pressure washing. About 10-15 gallons for two coats applied wet on wet.
  • We will reply to your comment shortly
    Cheri Brown · 07/31/2016
    I applied TWP 1500 to a new deck three years ago. It's time to reapply stain. The total square footage of the deck is 1,397. Could you tell me how much stain I will need to purchase and if any prep is necessary outside of power washing
  • We will reply to your comment shortly
    TWP Stains · 07/30/2016
    Eugenia Manning:
    I have an 18 year old treated pine porch, never been sealed or stained. I am not planning to treat the railing.
    What is needed to clean it (in the past clorox water has been used to removed mildew). Part of the porch is covered and part exposed to the elements. Several of the exposed boards have been replaced just recently. I want to use an oil based solid stain to protect what is there. In future, will I have to remove the stain on the porch before reapplying the same stain?

    I am sorry but TWP does not come in a solid stain. Semi-Transparent.
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    TWP Stains · 07/30/2016
    Nicole Zielinski:
    Hi, I need help figuring out how much product I need for 222 ft of 6 foot cedar privacy fence. The fence was installed in March of this year and hasn't been stained/coated with anything yet. I will be staining both sides. I live in Indiana so I will have to get the 1500 series. Also, would I just need to use the cleaner/brightener?

    Thank you so much!

    Yes on the prep. You have about 2700 sq. feet for both sides. For two coats of the TWP applied wet on wet, you will need 20-25 gallons.
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    Nicole Zielinski · 07/29/2016
    Hi, I need help figuring out how much product I need for 222 ft of 6 foot cedar privacy fence. The fence was installed in March of this year and hasn't been stained/coated with anything yet. I will be staining both sides. I live in Indiana so I will have to get the 1500 series. Also, would I just need to use the cleaner/brightener?

    Thank you so much!
  • We will reply to your comment shortly
    Eugenia Manning · 07/29/2016
    I have an 18 year old treated pine porch, never been sealed or stained. I am not planning to treat the railing.
    What is needed to clean it (in the past clorox water has been used to removed mildew). Part of the porch is covered and part exposed to the elements. Several of the exposed boards have been replaced just recently. I want to use an oil based solid stain to protect what is there. In future, will I have to remove the stain on the porch before reapplying the same stain?
  • We will reply to your comment shortly
    TWP Stains · 07/05/2016
    Ed Danek:
    We washed the deck with TSP. Do we need to do anything else before using TWP 100?

    If you have an old deck stain coating, you will need to remove it before using the TWP.
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    Ed Danek · 07/03/2016
    We washed the deck with TSP. Do we need to do anything else before using TWP 100?
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    TWP Stains · 06/28/2016
    Alan Johnson:
    I am trying to figure out how much I need. I am trying to stain a fence. It is a cedar fence. I have 610 pickets. Each picket is 3.5" X 5ft. That amounts to about 1000 sqft. so I would get two 5 gallons. My question is if I wanted to cover both sides of the picket would I need 20 gallons??

    Yes if you have twice the amount to cover, you would need twice the stain.
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    Alan Johnson · 06/28/2016
    I am trying to figure out how much I need. I am trying to stain a fence. It is a cedar fence. I have 610 pickets. Each picket is 3.5" X 5ft. That amounts to about 1000 sqft. so I would get two 5 gallons. My question is if I wanted to cover both sides of the picket would I need 20 gallons??
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    TWP Stains · 06/27/2016
    Teresa Fusco:
    Hi, I just did the calculation for my deck. I have a small deck... About 400 sq feet. It says on the calculator summary that this would be about 4 gallons for two coats wet on wet. My deck was put in last fall and it is now seasoned wood that has never been stained. Do I put one coat or two...? And if I buy a 5 gallon instead of the 4 the calculator suggests for two coats... Would this extra gallon left over still be good to mix and use next year for ant touch ups on the steps or floor of my deck...? Or do you suggest a new can at time of reapplication?

    Apply two very light coats this year. See this about shelf life:

    http://www.twpstainhelp.com/shelf-life-of-twp/
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    Teresa Fusco · 06/27/2016
    What is the difference between the Gemini Restore a deck and the Restore a deck company restore a deck product? It has the same name but different company... I'm confused... Are they the same product or not?
  • We will reply to your comment shortly
    Teresa Fusco · 06/27/2016
    Hi, I just did the calculation for my deck. I have a small deck... About 400 sq feet. It says on the calculator summary that this would be about 4 gallons for two coats wet on wet. My deck was put in last fall and it is now seasoned wood that has never been stained. Do I put one coat or two...? And if I buy a 5 gallon instead of the 4 the calculator suggests for two coats... Would this extra gallon left over still be good to mix and use next year for ant touch ups on the steps or floor of my deck...? Or do you suggest a new can at time of reapplication?
  • We will reply to your comment shortly
    Bob Taft · 06/19/2016
    Wow, that was quick thanks, now where do I find a TWP-100 dealer in Syracuse, NY. I can't find a search box, on your site, to locate local distributors/vendors in my area
  • We will reply to your comment shortly
    TWP Stains · 06/10/2016
    James Plath:
    Hello....I need to stain a new cedar fence using your 1500 Series stain that is approximately 120 feet long by 6 feet high. It will be stained on both sides. How many gallons of stain would you recommend I purchase?

    Thank you!

    Sounds like you have roughly 1440 sq. feet total for both sides. About 15 gallons will cover for two coats.