Deck Calculator & Cost Planner

Deck Planner is a deck calculator and deck cost calculator in one: it draws your deck to scale, prices it in seconds, builds the shopping list and sizes joists, beams and stairs to code.

DRAW IT
Type a length and a width and watch the deck appear: every board course, joist, stair and railing post. Change the board direction, add a picture-frame border or 12 inch joist spacing and the drawing, board count and cut list update as you type. The deck board calculator is offcut-aware, so it tells you what to buy at the lumber yard, not a rounded guess.

PRICE IT
The Deck Cost Calculator gives you a low, typical and high figure for the whole job: framing and footings, decking by material (pressure-treated, cedar, redwood, composite, PVC, ipe), railing by type, stairs by step count, a roof or pergola if you want one, lighting, tear-out of the old deck, permit and contingency. Choose DIY, handyman or contractor and your state so labor and material bands match your region. Every assumption is shown and editable, and the result is a range, because a single number would be a lie.

Cost tools built from what people actually search for:
- Cost per square foot, by material, installed
- Deck Size Explorer: 14 common sizes from 8x8 to 20x30, each with boards, joists and cost
- Composite vs wood over 25 years, including re-staining and replacement
- Railing cost per foot for wood, composite, aluminum, cable and glass
- Deck stairs cost, covered deck and roof cost, porch and balcony cost, pool deck cost
- Cleaning, sealing and refinishing cost, pro versus DIY
- Repair or replace: boards, joists, posts, railing, stairs, ledger
- Financing: monthly payment at your rate and term

NEW IN 1.4
- Deck quote checker: enter a contractor's price and see if it is low, fair or high for that size, material and type of deck, and what to ask
- PVC deck cost: lineal feet of TimberTech AZEK boards by line, board cost, installed range and the same deck in composite
- Deck ramp: run, landings, stringers and handrails to IRC or ADA rules
- Privacy screen: 4x8 lattice panels, posts, rails and moulding
- Board foot calculator, and deck square footage for L-shaped, clipped, octagon and round decks
- Every calculator page on smartdeckingcalculator.com opens the same tool in the app

BUILD IT TO CODE
- Joist span checker against the IRC R507.6 tables for 2x6 through 2x12, every species group, 12/16/24 inch spacing, with a pass or fail and the next size up
- Beam sizing, post count, footing diameter and frost depth
- Stair stringer layout drawn as a profile: risers, treads, angle, board length, IRC R311.7 checks
- Baluster spacing to the 4 inch sphere rule, cable railing runs and tensioners
- Ledger fasteners, joist hangers, blocking, live, snow and wind loads
- Can my deck hold a hot tub? Filled weight against the framing

STAY ON TOP OF IT
- Maintenance reminders: a local notification when the re-seal is due. Nothing is sent anywhere.
- Saved projects with the full estimate, shareable as text or PDF
- A price book of your supplier prices; customers, quotes with markup, change orders

WORKS WITHOUT A SIGNAL
Every one of the 100 tools runs on the phone. No account, no sign-in, no connection required.

FREE, AND WHAT PRO ADDS
Every calculator is free and stays free. Pro Contractor is a one-time purchase for the business layer: branded PDF quotes with no watermark, unlimited saved projects, an unlimited price book and CSV import and export. Or watch one short video for 24 hours of Pro. Remove Ads Forever is a separate one-time option. No subscriptions.

ABOUT THE NUMBERS
Costs are planning ranges from national material and labor bands, adjusted by region; get local quotes before you commit. Span, footing and stair figures follow the IRC 2021 tables and are planning aids: codes vary by county and your inspector has the final say.

Companion app to smartdeckingcalculator.com, by DixonAppStudio.

Recent changes:
Remove ads with one simple, one-time purchase, offered under your results. The app now also speaks French, German and Indonesian. Smoother ad timing and stability fixes.