Free Tools for Interior Designers, Architects & Photographers

Thirty-three working tools, free and without signup — the calculations and documents designers, architects and photographers reach for on every project, done the way a professional workroom, lighting plan or drawing set would do them. Built by Nakada Design, the Los Angeles marketing agency for interior designers, architects and photographers.
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For Interior Designers

Space Planning

Rug Size Calculator

The rug size a designer would specify — by room, bed or dining table, with placement rules and a visual preview.

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Lighting

Recessed Lighting Calculator

How many recessed lights, exact spacing and wall offsets — the lumen method plus the ceiling-height rule, with a layout diagram.

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Textiles

Fabric Yardage Calculator

Upholstery yardage from the standard workroom chart and drapery yardage with fullness and pattern repeat.

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Walls

Wallpaper Calculator

Rolls to order — US double rolls, Euro rolls or grasscloth — with the strip math and repeat rounding installers use.

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Millwork

Board & Batten Calculator

Perfectly even batten spacing to the sixteenth of an inch, a cut list and an elevation diagram for any wall.

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Millwork

Crown Molding Calculator

Linear feet, stock pieces and cost — plus the exact compound miter and bevel angles for inside and outside corners.

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Construction

Stair Calculator

Riser count and height, tread depth, total run, stringer length and angle from a floor-to-floor measurement — with a building-code check.

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For Your Studio

Interior Design Fee Calculator

Build your hourly rate from income and overhead, price flat fees by scope, and model markup and per-square-foot fees.

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For Your Studio

Contract & Proposal Builder

Check off the clauses you need — scope, markup disclosure, purchasing, photo rights, kill fee — and generate a formatted letter of agreement to copy, print or download.

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Marketing & Social

Instagram Caption Generator

Captions, hashtag sets and bio lines written for interior designers — choose a post type and generate on-brand copy in seconds.

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Marketing & Social

Instagram Engagement Rate Calculator

Enter followers and average likes, comments, saves and shares to get your true engagement rate and how it compares.

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For Architects

Site & Daylight

Sun Path Diagram Generator

An accurate stereographic solar chart for any latitude — solstice and equinox arcs, hourly positions — to download as SVG or PNG.

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Site & Daylight

Site Analysis Checklist

A project-specific checklist across all six layers of site analysis — climate, zoning, context, site, sensory, synthesis. Print or copy it.

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Structure

Roof Pitch & Rafter Calculator

Rafter length, ridge height, roof angle and area for gable, hip and lean-to roofs from span and pitch.

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Accessibility

ADA Ramp Calculator

Required ramp length at 1:12, landing positions and handrail triggers from a total rise — with code-compliant slope checks.

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Structure

Beam & Joist Span Calculator

Estimated maximum span for joists, rafters and beams from species, grade, size, spacing and load — bending, shear and deflection, engineer-verify.

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Feasibility

Cost to Build a House Calculator

Construction cost by area, quality tier and region, with a hard-and-soft-cost breakdown, contingency and a blended cost per square foot.

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Zoning & Feasibility

FAR, Lot Coverage & Parking Calculator

Maximum buildable area, lot coverage, required parking and density with pass/fail checks and a scaled site diagram.

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For Your Firm

Architect Fee Calculator

Billing rates from salary, overhead and profit, project fees as a percentage of construction cost, and fee-to-hours budgeting.

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Licensure

AXP Hours Calculator

Track your NCARB experience hours across the six areas and get a projected licensure date at your current working pace.

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For Your Firm

Architecture Proposal Generator

A complete, structured fee proposal letter — scope by phase, fee basis, exclusions and terms — ready to copy, print or download.

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AI & Workflow

AI Prompts for Architects

Twenty-four field-tested ChatGPT and Midjourney prompts for narratives, zoning memos, specs, RFIs, client emails and visualization.

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Drawing & CAD

Architectural Scale Converter

Convert paper measurements to real dimensions at any imperial, engineering or metric scale, rescale a reprinted set, and pull the CAD scale factor and viewport zoom.

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Code & Egress

Occupant Load & Egress Calculator

IBC occupant load, required exits and egress width from area and use — plus an IRC egress-window checker for the 5.7 sq ft clear-opening rule.

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Energy & Envelope

R-Value & U-Value Calculator

Stack up a wall, roof or floor assembly for total R-value, U-factor and an IECC climate-zone check, with a full insulation R-value chart.

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For Photographers

Business

Photography Contract & Release Builder

Build a session contract, model release, print release and invoice — fill in the blanks, then print or download. No signup.

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Print & Resolution

Print Resolution Calculator

Convert pixels to inches at any DPI and check whether a photo prints sharp at 8×10, 16×20 or 40×60 before you send it to the lab.

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Image Tools

Watermark Maker

Add a text or logo watermark to your photos and batch-apply — entirely in your browser, so your images never leave your device.

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Planning

Shot List & Timeline Generator

Editable, printable shot lists for weddings, portraits, products and more — plus a wedding-day timeline built backward from the ceremony time.

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Light & Planning

Golden Hour Calculator

Today's golden and blue hour for any location and date, with sunrise, sunset and solar noon and a visual timeline of the day's light.

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Branding

Business Name Generator

Hundreds of studio name and slogan ideas by genre and style, with one-click links to check domain and Instagram handle availability.

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Light & Optics

Depth of Field & Hyperfocal Calculator

Near and far focus limits, hyperfocal distance, angle of view and full-frame equivalent for any sensor, focal length and aperture — with a visual focus map.

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Business

Pricing & Cost-of-Doing-Business Calculator

Your true day rate and hourly rate from your Cost of Doing Business, a session price builder from time and costs, and the bookings you need to break even.

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Why a Marketing Agency Builds Free Design Tools

Because this is what we sell, demonstrated instead of described. Nakada Design grows interior design studios and architecture firms with SEO, content, advertising and AI automation — and useful, accurate, beautifully made resources are exactly what wins attention from search engines, AI assistants and affluent clients alike.

Use the tools freely, share them with your team, link to them from your own site. And if you want this kind of visibility working for your practice — clients finding you at the moment they need a designer or architect — that is the system we build. For studios, start with our digital marketing service for interior designers or SEO service for interior designers; for firms, our digital marketing service for architects or web design for architects.

Have an idea for a tool designers would use every week? Tell us below — the best suggestions get built.