🏯 Interior ToolPersonal / Pro

Tatami Raised Platform Calculator

Draw the platform → auto-compute frame, plywood, surface, underlay, skirting →
Print an A4 client quote.

What used to take a carpenter 30 minutes on a notepad now finishes in 30 seconds. Main joists auto-align with plywood seams, 2D packing pairs offcuts, underlay rolls round up, and door-opening skirting deductions are automatic.

Shares an unlock key with the Floor Simulator — buy one, unlock both.

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The 4 worst things about tatami / raised-platform takeoffs

Exactly what this tool was built to fix

🤯

Brain-fryer math, easy to over- or under-order

How many main joists, sub joists, plywood sheets, underlay rolls — each in different units and different logic. A pen and paper for 30 minutes might still come out wrong.

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Plywood seams not landing on joists

Set main/sub spacing wrong and plywood seams float between joists — you'll have to add extra battens to support them, wasting material and time.

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Order too much plywood, leftovers pile up in storage

11 offcut pieces could pack into 4 new sheets, but without 2D packing math people just multiply 'pieces × 1.2 waste' → 30% over-order.

📄

Client quotes still need Excel formatting

Once you finish counting, you still type Excel, paste a logo, format A4 — half a day per quote. Change one dimension and redo it all.

What this tool does

Platform shape → BOM → quote, end to end

📐

Platform shape: rectangle / L + columns

Drag length / width / height, L-shape inner corners, 0–2 interior columns auto-notched, 3D updates live.

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Surface: laminate / engineered / solid wood

Plank length & width tunable, 5 start angles, long/short axis switch, mm-level expansion gap.

🧱

Joists auto-align with plywood

Main joists evenly along plywood short edge, sub joists along long edge — plywood seams land exactly on joist centerlines. Zero snap waste.

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Smart 2D plywood packing

11 cut pieces auto-pack into 4 new sheets via guillotine FFD, with sheet IDs 1-2-3 labeled — lumber yard reads it directly.

🛡️

Underlay + skirting

PE / EPE / Tyvek 3 specs with auto roll count. Skirting auto-deducts door opening lengths.

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One-click A4 quote

Client info, line items, totals, terms, signature — 4-column, 3-table layout on one A4 page. CSV export BOM for the crew.

Parameters you can tweak

The algorithm auto-computes frame, plywood seams, surface layout, underlay rolls.

Platform shape (rectangle / L)

Live 3D as you drag length/width; L-shape inner corners can dodge columns, beams, window frames.

Platform height (H)

30–60 cm tunable; over 60 cm the system warns to add sub posts to avoid wobble.

Interior columns (0–2)

Notch a rectangle into the platform for each column position; 5 mm clearance to column face.

Surface spec

Laminate / engineered / solid wood, plank length & width tunable — compare which spec wastes less.

Layout pattern (5 types)

Straight, 1/2 stagger, 1/3 stagger, herringbone, chevron V — start angle independently tunable.

Main joist spacing

Back-solved from 'plywood short edge ÷ N' so plywood seams always land on joist centerlines.

Sub joist spacing

30 / 40 / 45 cm presets — bigger spans auto-upgrade to thicker battens.

Plywood spec (4×8 / 3×6)

Toggle between specs to compare waste; auto 2D layout.

Underlay spec

Pick PE / EPE / Tyvek — different roll length & width auto-computes roll count.

Skirting (height / door cuts)

Set skirting height; mark door positions and the system auto-deducts from total length.

Auto-generated outputs

Six artifacts at once — print A4 and bring it to the shop or hand it to the client.

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Frame BOM

Top frame, bottom frame, main joists, sub joists — meters & counts. Dual-labeled Taiwanese tsai / feet.

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Plywood layout drawing

Auto 2D guillotine FFD packing, sheet IDs 1-2-3 labeled, lumber yard reads it directly.

🛡️

Underlay roll count

Round-up from platform area + roll spec; door openings auto-deducted.

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Surface plank count

Start angle, expansion gap, 5 layout patterns all baked into the waste calc.

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A4 client quote

Client info + line items + totals + terms + signature — one A4 page.

📊

BOM CSV export

Excel opens cleanly, crews use it for procurement directly.

Real outputs

These are actual artifacts the tool produces — they update live as you change dimensions.

2D framing + column notches
Rectangle / L-shape + 0–2 column notches; main along short edge, sub along long edge, auto evenly spaced.

3D exploded view
Top frame, bottom frame, plywood, surface — each layer expanded. Clients grasp why it's NT$ 8,000+ per ping in seconds.

2D surface layout
Start angle, expansion gap, long/short axis direction baked in — clients pick patterns by sight.

※ Change dimensions / surface / column count — these all redraw live.

Who it's for

🔨

Carpenters / GCs

Client asks 'how much per ping for a tatami' — pull out your phone, change dimensions, requote on the spot.

🏠

DIY home tatami builders

Read the BOM, walk into the lumber yard — no contractor needed, no Excel, even plywood packing is told to you.

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Interior designers

Drop a 3D + quote into your pitch, client closes on the spot.

🎓

Carpentry academy students

Run the framing logic from class on real numbers. Bridge from practice to client work seamlessly.

⚠️ Not for these situations

Non-orthogonal platforms (slanted walls, curves, irregular edges) — only rectangle and L-shape supported
More than 2 interior columns — multi-column requires manual segmentation
Tatami mat / igusa sizing precision — this tool computes the underframe and plywood, not the tatami mats themselves
Existing CAD/Revit workflows — this fills the gap for those who lack CAD but still need takeoffs

When you'll use it

🔨 On-site quoting

Client asks 'how much per ping for a 3 m × 4 m tatami' — pull out your phone, sketch 3D and A4 quote in 30 seconds, close right there. Spec changes recompute instantly; no Excel back at the studio.

🏠 DIY tatami builders

Building a sleeping platform, a guest tatami room, a storage podium — draw the platform → tool tells you how many 12-ft battens, how many plywood sheets, how many underlay rolls. Walk into the lumber yard ready.

🪜 Designer pitches

Drop 3D + quote on a tatami proposal, beat the competition by one extra page and win the project. Client says 'change to 50 cm height' — change on the spot, no overnight grind.

🎓 Carpentry academy students

The framing logic, plywood seam alignment, underlay principles you learned in class — this tool shows you 'how the algorithm computes them'. Bridge from practice to client work.

FAQ

How is this different from the Floor Simulator?▾

The floor simulator computes flat-laid wood flooring (laminate / engineered) with no frame. The raised platform is a 30 cm+ podium with top frame, bottom frame, main joists, sub joists, plywood, underlay, skirting — the wood-construction method for tatami / underlay beds / guest sleeping platforms. Both share the same unlock key — buy one, unlock both.

Does the plywood packing really save material?▾

Real test: 11 cut pieces packed via 2D guillotine — a 3 m × 4 m tatami originally costing '8 full sheets + 11 cuts = 19 plywood sheets' becomes '8 full sheets + 4 new sheets cut into 11 pieces' = 12 sheets total. Saves 7 sheets (~35%), NT$ 3,500+ saved.

Is the quote accurate?▾

Material quantity is BOM-precise (main joist meters, plywood sheet counts, underlay rolls — units all correct). Unit prices use your own lumber-yard cost and your own labor rate. The system doesn't sneak in 'market price' inflation — all unit-price fields are blank for you to fill. Whatever you fill is what gets calculated.

Can I export PDF / CSV?▾

A4 quotes print straight from the browser → Save as PDF. Logo / company info / terms are filled once in 'Branding' panel and reused. BOM exports to CSV, Excel opens cleanly.

How much does the tool cost?▾

Pro Monthly $9/mo — includes all 26 furniture templates + ceiling framing + floor simulator + raised platform. Pro Annual $79/yr — adds client quoting system + STL/CNC export + unlimited dimensions.

Can I buy just the raised platform tool?▾

Yes. The raised platform shares the 'floor' unlock key with the Floor Simulator — a single-tool purchase unlocks both. See /pricing.

My place isn't a perfect rectangle — anything besides L?▾

v1 supports rectangle, L-shape, and up to 2 column notches. Non-orthogonal polygons (slanted walls, U-shape, cross shape) are on the roadmap and will land in the same wave as the floor simulator — seamless upgrade.

Will the tool keep getting updates?▾

Yes. The tool launched 2026-05 — 3D layer toggles, plywood packing algorithm, install-step cards, underlay catalog were all added within 2 weeks of launch. Roadmap: more columns, slanted edges, herringbone surfaces, on-site cutouts (light fixtures / outlets).

How to unlock Raised Platform

Pick one of three paths; shares an unlock key with the Floor Simulator

Single buy

Single-tool unlock

$14.99lifetime

✓Permanent unlock of raised platform + floor simulator
✓Use it without subscribing
✓Future improvements auto-included

View single-buy plan

Personal subscription

$9/mo

✓All 26 furniture templates unlocked
✓Ceiling + floor + raised platform
✓Unlimited PDF print + cloud storage

Upgrade Personal

Pro tier

Pro subscription

$79/mo

✓Everything in Personal
✓Client quoting + customer management
✓STL/OBJ export + unlimited dimensions

Upgrade Pro

Annual plan saves one extra month · Academy lifetime members DM for code ·see full plan comparison

Companion tools to win projects and crunch numbers together

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Floor Installation Simulator

Plank floor takeoff + 5 layout patterns + A4 quote. Shares an unlock key with raised platform.

🔨

Wood Ceiling Framing Simulator

Batten grid + fiber-cement boards + hangers. When clients want 'ceiling + floor together', one-stop done.

🪑

26 furniture templates

From pencil holders to wardrobes — designers often pair these with interior projects.

Skip the 30-minute math, win one more quote

Tatami one, guest room one, sleeping platform one — save hours each month, double your close speed.
Less than a cup of coffee, a full toolkit comes with you.

Pro Monthly $9/mo · all 26 furniture templates + ceiling + floor + raised platform

Reference: Taiwan tatami raised-platform market runs NT$ 8,500/ping and up — one miscalculated ping costs more than half a year of this tool's subscription.