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Measuring calculators
Area, volume, fractions of an inch, unit conversions and reading a tape measure: the measuring every other job starts with, in imperial or metric.
CM to inchesExact inches, the nearest 1/16 on a tape, feet and inches, height and a chartFraction calculatorAdd, subtract, multiply and divide fractions with every step, decimals and tape marksSquare footage calculatorSquare feet or square meters of any room, yard or shape, with walls and unit conversionUnit converterLength, area, volume, weight, temperature, speed and pressure, exact, with the mathHow to read a tape measureTap the tape to read any line, practice, find half of a length, print a chartVolume calculatorAny shape in cubic feet, yards and gallonsHow to read a micrometerTurn a micrometer and watch sleeve, thimble and vernier add up; practice inch and metricCubic feet calculatorCubic feet, gallons, liters and cubic yards of a room, box, truck or container, exact cubic feet to gallons, and will it fitAcreage calculatorAcres from any lot shape or corner points, shapes that add up or come away, hectares, lots that fit and fenceWater weight calculatorGallons or liters to pounds and kilograms at any temperature, tanks, pools, sea water and other liquidsHow to read a caliperDrag the jaws to read vernier, dial and digital calipers, inch and metric, and practiceTire size calculatorCompare two tire sizes: height, width, speedometer and odometer error, same-height sizes on other wheels and a sidewall decoder
Which calculator for which job
Most jobs start with a measurement and one conversion. Pick the page by what you have and what you need.
| You have | You need | Use |
|---|---|---|
| The length and width of a room, yard or odd shape | Square feet or square meters | Square footage calculator |
| An area and a depth, or a box, cylinder or cone | Cubic feet, cubic yards or gallons | Volume calculator |
| Lengths like 3 5/8 and 1 3/16 | Their sum, difference or half, as a tape mark | Fraction calculator |
| A number in one unit | The same amount in another unit, exact | Unit converter |
| A tape measure and a line you can’t read | The reading in inches and fractions | How to read a tape measure |
| A length in centimeters, or a height | Inches, the tape mark, feet and inches | CM to inches |
| A caliper and a part to measure | The reading off the vernier, dial or digital scale | How to read a caliper |
| A micrometer and a part to a thousandth | The reading off the sleeve, thimble and vernier | How to read a micrometer |
The pages that measure have an Imperial | Metric switch at the top. The fraction calculator keeps exact fractions, so 1/3 stays 1/3 instead of 0.333, and it also finds the nearest tape-measure mark. The unit converter uses the exact definitions (an inch is 25.4 millimeters) and writes out the math for every conversion.
For a lumber list in board feet, use the board foot calculator in the construction section. To get an area without a tape at all, trace it on the satellite map above.