If you work with international clients or cross-border projects, you convert measurements constantly. Here's how to do it without errors.
The Canada Problem
Picture this: you're an architect from New Zealand, trained entirely in metric. You move to Vancouver and start working on Canadian projects. Canada is officially metric, so you'd think you're fine. Then the lumber arrives from the U.S. in imperial. The drywall specs are in imperial. The hardware catalog is in imperial.
Canada designs in metric but builds with American materials measured in imperial. Two countries standing firm on their systems, and architects caught in the middle doing mental math on every spec sheet.
And then there's the conversation problem. People switch between imperial and metric mid-sentence like they're the same thing. "It's a 10-foot ceiling with 600mm stud spacing." You'll hear someone call out dimensions in feet, then hand you a spec sheet in millimeters, then ask for the area in square feet. Everyone just assumes you're keeping up.
This isn't a niche complaint. It's the daily reality for anyone working across the border, or really anyone in Canadian construction. You end up converting constantly, and the margin for error is razor thin when a misread dimension means a wall that doesn't fit.
The Core Conversions
Every architect needs these memorized:
- 1 inch = 25.4 mm
- 1 foot = 304.8 mm (or 0.3048 m)
- 1 square foot = 0.0929 square meters
Common Floor Plan Dimensions
| Imperial | Metric |
|---|---|
| 10' x 12' (bedroom) | 3.05m x 3.66m |
| 8' ceiling | 2.44m |
| 3'0" door | 914mm |
| 2'6" door | 762mm |
Where Errors Happen
The most common mistake is rounding too early. Convert to the full decimal first, then round at the end. Rounding at each step compounds errors across a drawing set.
Try It Yourself
Arch Convert exists because two metric architects got tired of doing conversions by hand. One from New Zealand, one from the UK, both working in North America, both held hostage by a measurement system they never signed up for.
We sat down with them one evening and built the first version overnight. They've been using it daily since.
Arch Convert handles length, area, and volume conversions designed for how architects actually work.
You can type calculations directly into the input fields, so instead of converting a number and then doing math separately, just type 12.5 * 3 and get the converted result immediately.
No signup, no ads, completely free.
FAQ
What's the fastest way to convert feet to meters?
Multiply by 0.3048. For a quick estimate, multiply by 0.3 and add 1.5% (close enough for early-stage design).
Should I use millimeters or meters on metric drawings?
Convention varies by country. In Australia and NZ, millimeters are standard for construction drawings. In much of Europe, meters with decimals are more common. Match your client's local convention.
If you found this useful and have a problem you'd like us to solve, reach out to discuss.