See what you’re measuring.
Annotated helpers. Clear assumptions.
The construction calculator
Measure twice.
Math once.
Feet, inches, meters. Concrete, carpentry, the next job. Put the numbers in their place—with a maistro in your pocket.
Offline by designNo account needed
Less mental math.
More getting on with it.
THE UNITS COME WITH IT12 ft × 8 ft = 96 ft²
Units firstWorks without a signalSee the calculationKeep it with the job
A little less figuring
Put it to work.
Start with the measurements you have. See the quantity, the units, and how you got there.
One toolbelt. Different days.
Knows the numbers.
Speaks your trade.
A regular calculator when you know the process. A guided helper when you’d rather not keep the whole formula in your head.
01
General construction
The measurements and estimates that turn up on every kind of job.
Area · Volume · Material quantities
02
Concrete
Work from the shape and dimensions. Add an explicit allowance.
Slabs · Cylinders · Bag yield
03
Carpentry
Keep the geometry visible and the units attached to every number.
Stairs · Framing · Board feet
04
Roofing
Translate pitch and run into the dimensions you need to work with.
Pitch · Rise · Slope length
05
Electrical
Practical electrical arithmetic with the assumptions shown.
Ohm’s law · Power · Offsets
06
HVAC
Keep cross-sectional area, velocity, and room air changes straight.
Airflow · Duct area · Air changes
07
Plumbing
Turn a slope or a pipe measurement into a clear, usable result.
Slope · Pipe volume · Offsets
THE EVERYDAY ESSENTIALAnd a calculator
And a calculator
that gets units.
Mix feet and inches. Convert the result. Keep dimensional arithmetic honest.
See how units workMade to make sense
A number is better
with a little context.
Know which measurement goes where. Follow the steps. Save the result with the job, so you can pick up where you left off.
Open the field guideKeep it with the job.
A notebook, without the loose scraps.
Back patioSlab volume · saved calculation
1.63 yd³Workshop floorArea · saved calculation
96 ft²Illustrative project entries
No signal? No problem.
The job doesn’t stop
where the Wi-Fi ends.
Your calculator, helpers, and saved work live on the device. Open the app and get on with it.
Before you get to work
Good questions.
A few things worth knowing about the tool in your pocket.
Does it work without internet?
Yes. The mobile calculator, trade helpers, projects, and history run on the device. Installing the app and getting store updates require a connection.
Can I mix feet, inches, and metric units?
Yes. Enter units with your values and choose a compatible unit for the result. The calculator checks dimensions, so adding a length to an area produces a useful error.
Is this an engineering or code-compliance tool?
iMaistro helps with arithmetic and quantities. Its helpers explain their formulas and assumptions. It does not certify structural designs, electrical installations, or compliance with local requirements.
Do I need an account?
No. This version keeps your work locally and has no account, subscription service, or cloud sync. Use a backup export to keep a separate copy of important saved work.
Is it available in the stores yet?
Not yet. This is the first working version. The download page clearly marks store links as coming soon until the listings are published.
Tu maistro de bolsillo
Keep a good tool close.
Built for the numbers that come with the job.