Calculators - Estimators - Template Generators
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If you don't have a (correct) scale rule, you can print this page, fold the paper and use as a ruler. Print this page (at 100% printer scale) and check the 1:1 scale against a standard rule or tape. If it's not exact, mouse over Scale arrows to increase or decrease scale and re-print.

Scale 1 :
Scale Calculator
Set printer scale to 100%, margins to 0 and page orientation to Landscape.

If your plan's been re-printed or copied to different scale, use the Scale Calculator to find new scale.


Total Length

Alert Set printer scale to 100%
The rulers below are pre-set to commonly used scales. Print this page and compare the 1:1 scale against a standard tape or ruler.
Un-check Top Border to remove ruler top line. Open new window to create PDF and print.

Calculate Scale
Measured Length Plan/Screen
Full Scale Length
Measure at Scale
Measured Length
Scale 1 :
Scale from Plan or On-screen Image Take a measurement from plan or on-screen image and enter it and the actual length it represents to calculate the scale.

For an on-screen image, measure the known dimension of an object in the image (eg: a wheel diameter)

Measured Length

Scale from On-screen Image Measure at Scale From On-screen Image
Use a full scale ruler to measure a known measurement from an image on-screen. In the Calculate Scale dialog, enter this measurement into Measured Length and the actual full scale measurement into Full Scale Length. Hit Calculate Scale to calculate the scale. This enters the scale into the lower Measure at Scale dialog. Now, measure any length from screen image or plan, enter into Measured Length and hit Calculate to calculate the actual full scale length.

If scaling from an on-screen image, you can enlarge the image on the screen for more accurate measurements.
Hold down the CTRL key and hit + to enlarge, - to decrease size and 0 to re-set to 100% (normal).

Strangely enough, because the paper scale rules are much thinner than conventional scale rules, it can be easier to take measurements from plans. Conventional scale rule edges are thicker than paper, so the calibrations sit above the plan surface. The paper scale rules sit flat, directly over measurements being scaled.

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Metric or Imperial
The main (larger) navigation menu tabs are for the Metric versions of calculators.
If there is an Imperial (Feet and Inches) version, under the main Metric tab will be a smaller Imperial tab.

Create PDF files to print diagrams on current page. Print large images over multiple pages Printing to Scale Help and Plan Printing.

Slider Controls To fine tune Slider Controls click to select and use (cursor) keyboard keys.

Use your iPad or Android Tablet On-Site Your iPhone or Android is a valuable On-Site tool!
Lay your device on an angled surface (roof ?) to directly measure angles and automatically calculate Roofing and Pitch Angle Apps.

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Blue Dragon Children's Foundation

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ph: (Australia) +61 7 40987645 mob: 0438 165 753

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All calculators on this site are GEOMETRIC only. Check local regulations for sizes, spacings and all engineering requirements.

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