LoadLens — cooling load from a floor plan PDF

1. Project and design conditions

Every value you change is used immediately. Results update as you type.

Project name Country City / region Outdoor dry bulb (°C) Outdoor wet bulb (°C) Indoor dry bulb (°C) Indoor RH (%)

Construction and system assumptions

Wall U value (W/m²K) Glass U value (W/m²K) Glass shading coefficient (SC) Roof U value (W/m²K) Roof equivalent ΔT (K) Partition U value (W/m²K) Infiltration (air changes / hour) Safety factor (%) Supply air ΔT (K) Glazing, if glass area is blank (% of wall)

2. Upload a drawing or a room schedule

Accepted files: .pdf floor plan drawings, and .csv / .tsv / .xlsx room schedules (from Revit or Excel). You can upload many files at once. Rooms found are added to the table below — existing rows are not deleted.

Reading PDF drawings and room schedules in your browser

Read scanned drawings with OCR (slow) Use this only for scanned or image PDFs, where no text can be read. Leave it off for normal drawings.

Drag and drop your drawing or room schedule here

PDF drawing, or CSV / TSV / Excel room schedule · click to choose files

3. Draw rooms on the plan

Set the drawing scale, then drag a rectangle over a room to add it as a room — the area is measured from the rectangle and that scale. The boxes below are the rooms you have placed; rooms found by reading the PDF stay in the table, but Place all rooms on the plan gives every one the drawing names a locator box where the sheet names it, sized back from that room's own area (it is a locator, not the traced room boundary). Trace real outlines reads the plan's own wall lines and gives the rooms it can trust a real outline shape — a room whose shape the plan does not enclose, or whose traced area does not agree with the stated one, keeps its box. Remove outlines takes those shapes away again and leaves the boxes alone. Remove placed rooms takes those boxes away again and never touches the rooms you drew yourself. Click a box in Select / edit to open that room's breakdown. In Select / edit you can also drag a room to move it, drag a corner to resize it, press Delete to remove it, and middle-drag or hold Space to pan the sheet. All of this stays in your browser, and the drawing is kept here too — reload the page, or come back tomorrow, and it is still here with your boxes on it.

4. Load summary

Level wise subtotal

Level	Rooms	Area m²	Area ft²	TR	Supply air L/s	Fresh air L/s	ft²/TR

5. Rooms — check and edit

Grey values are the defaults we calculated from the room type — the load uses them. Type your own value to override. Click a row to see the load breakdown.

Bulk edit (applies to the rows shown above): Orientation Roof Tip: use the filters to pick one level first.

In	Level	No.	Room name	Space type	Area m²	Height m	People	Light W/m²	Equip W/m²	Orient.	Ext wall m²	Glass m²	Roof	Partition m²	Sensible W	Latent W	Total W	TR	L/s	ft²/TR	Source

Load breakdown

6. Save and export

Your work is saved automatically in this browser (local storage). Opening the page again restores it. Use Save project to keep a file copy or to move it to another computer.