Latest articles
Practical guides on measuring angles, slope and level — with and without a phone.
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How to Measure (and Mark) a 30-Degree Angle
Four ways to measure and mark a 30-degree angle — protractor, speed square, 30-60-90 triangle, or the 2:1 hypotenuse trick — plus a phone check of the cut.
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How to Hang Pictures Perfectly Level (Every Time)
Why frames end up crooked, how to level them with the phone-on-the-frame trick, hanging with two hooks, and keeping a gallery wall straight for good.
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Angle Measuring Tools Compared: Which One Do You Need?
What each angle measuring tool does best — protractor, T-bevel, speed square, digital angle gauge, phone app, online protractor — and how to pick one.
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How to Measure the Angle Between Two Walls
Three ways to measure the true angle between two walls — phone with zeroing, T-bevel and protractor, or camera mode — and turn it into the right miter cut.
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How to Measure a Ramp's Slope (and Check the ADA 1:12 Rule)
How to measure a ramp's slope with your phone and check it against the ADA 1:12 maximum — plus percent and degree conversions, cross-slope, and landings.
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What Your Level App's Degrees Mean (Left, Right, and 0°)
What the degree readout on a level app measures, what left and right tell you, how many degrees off level the eye can see, and how to reach a true 0.0°.
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How to Use a Digital Angle Gauge
How to use a digital angle gauge to set saw blades, bevels, and miters accurately — zeroing, absolute vs relative modes — and how a phone compares.
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Goniometer Basics: Measuring Joint Range of Motion
What a goniometer is and how it measures a joint's range of motion — plus how a phone angle app works as a digital goniometer for flexion and extension.
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How to Measure a Staircase Angle (and Stringer Cut)
How to measure the angle of a staircase and lay out a stringer — using rise and run, your phone, or a framing square. With typical stair angles.
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How to Cut Miter Angles (Trim, Frames & Crown)
How to measure and cut accurate miter angles for trim, frames, and crown molding — plus how to split an uneven corner and check the joint closes tight.
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Common Roof Pitches: A Chart of Degrees, Ratio & Percent
A reference chart of common roof pitches — from low-slope 2-in-12 to steep 12-in-12 — with each one's degrees, percent grade, and what it's used for.
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How to Measure Roof Pitch From the Ground
How to measure roof pitch from the ground with your phone's camera — or on the rafters with a level and tape. With pitch, degrees, and ratio explained.
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How to Use a Bubble Level (and Your Phone as One)
How to read and use a bubble (spirit) level to check level and plumb — and how your iPhone works as a digital level with an exact degree readout.
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How to Find the Angle of a Triangle
How to find an unknown angle in a triangle — using the angle sum rule, basic trigonometry (sin, cos, tan), or by measuring directly. With worked examples.
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Degrees, Percent Slope, and Ratio: How to Convert
Degrees, percent grade, and X-in-12 ratio are three ways to describe the same slope. What each means, how to convert between them, and when each is used.
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How to Measure an Angle in a Photo or on Screen
How to measure an angle you can't reach — in a photo, on screen, or at a distance — using a camera protractor app or an online protractor.
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How Accurate Are Phone Angle & Level Apps?
How accurate is measuring an angle with a phone? An honest look at iPhone sensor accuracy, what affects it, and when to reach for a calibrated tool.
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How to Measure Slope and Incline (Degrees, % and Ratio)
How to measure the slope or incline of a ramp, driveway, or roof — in degrees, percent grade, or ratio — using your phone as an inclinometer.
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How to Measure (and Check) a Right Angle
How to measure a 90-degree right angle and check a corner is truly square — with a try square, the 3-4-5 method, or your phone. For carpentry and DIY.
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Types of Angles Explained (Acute, Right, Obtuse & More)
A clear guide to the types of angles by degree — acute, right, obtuse, straight, reflex, and full — with everyday examples and how to tell them apart.
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How to Measure an Angle Without a Protractor
No protractor? Measure an angle with your phone, simple trigonometry, or a folded sheet of paper. Practical methods for school, DIY, and woodworking.
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Measure an Angle With Your iPhone in 10 Seconds (No Protractor)
Your iPhone already has the sensors to measure an angle. Rest it on a surface for a live readout, or point the camera at one you can't reach. Free to try.
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How to Measure (and Mark) a 45-Degree Angle
Five ways to measure and mark a 45-degree angle: protractor, speed square, combination square, paper fold, or phone — plus how to check a miter is true.
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What Is the Measure of an Angle? (How to Find It)
What the measure of an angle means, the units it's given in, and three ways to find it — with a protractor, your phone's sensors, or simple trigonometry.
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How to Use an Angle Finder (Manual & Digital)
How to use an angle finder step by step — sliding bevels, digital angle gauges, and the angle finder app on your phone — to read or transfer any angle.
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Angle Degrees Explained: How Angles Are Measured
What a degree really is, how to read angle degrees with a protractor or your phone, and the angles worth memorizing — a plain-English guide.
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How to Measure an Angle (With or Without a Protractor)
Five reliable ways to measure an angle — with a protractor, with your phone, with the maths, or with nothing but a ruler — and when to reach for each one.
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How to Measure Roof Pitch (From the Ground or the Roof)
How to measure roof pitch in degrees and as an X-in-12 ratio — with a phone, a level and tape, or from the attic — plus how to convert between the two.
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How to Use a Protractor: Measure, Read and Draw Angles
How to use a protractor to measure and draw angles: place the origin on the vertex, align the baseline, pick the inner or outer scale, read to the degree.