Deck Stain Calculator
Calculate how much deck stain or sealer you need (litres or gallons) based on deck area, stain type, and coats.
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How to Calculate Deck Stain
Measure deck area. Add 20% for railings if applicable. Divide by coverage rate and multiply by number of coats. Round up to nearest gallon.
Frequently Asked Questions
How much deck stain do I need?
One gallon covers 150-300 sq ft depending on type. Transparent: 150-200. Semi-transparent: 200-250. Solid: 250-300. New wood absorbs 20-30% more.
How much does deck stain cost?
Budget deck stains cost $20-$35 per gallon, mid-range $35-$55, and premium (like TWP, Cabot Australian Timber Oil) $45-$70 per gallon. A 300 sq ft deck typically costs $80-$200 in stain.
How often should I restain a deck?
Transparent stains last 1-2 years. Semi-transparent stains last 2-3 years. Solid stains last 3-5 years. Horizontal surfaces wear faster than vertical. Test by sprinkling water — if it soaks in rather than beading, it's time to restain.
Do I need to strip old stain before restaining?
If the old stain is peeling or flaking, yes — strip it with a deck stripper or pressure washer. If it has simply faded evenly, you can clean and restain directly over it with the same type (oil over oil, water over water).
Should I stain a new deck immediately?
Wait 2-4 weeks for new pressure-treated wood to dry before staining. Test by sprinkling water — if it absorbs within 10 minutes, the wood is ready. New cedar or redwood can be stained immediately as they are naturally dry.