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The Significant Figure Calculator uses the geometric shapes of a triangle and rectangle as an example for using Math and Physics formula to produce results that can then be used to illustrate the application of significant figures in Physics. The formula used in the geometric calculations is for example, you can access a comprehensive list of geometric calculators here including two dimensional shape calculators and three dimensional shape calculators.
Note that the Significant Figure Calculator uses inputs a, b and c for computation of triangle related formula and inputs a and b for rectangle related formula. The formula and computations will calculate for both metrics as the aim of this calculator is to illustrate the application of significant figures in the computation of Physics formula, not for specific geometric shape calculations which are available at the links mentioned above.
Perimeter of Triangle (x) |
Perimeter of Rectangle (P) m |
Area of Rectangle (A) m2 |
Volume of Cuboid (V) m3 |
Density of a Substance (ρ) kg/m3 |
Pressure (P) N/m2 |
Average velocity (< v >) m/s |
Acceleration (a) m/s2 |
Perimeter of Triangle Formula and Calculation |
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P = a + b + c P = + + P = m (metre) |
Perimeter of Rectangle Formula and Calculation |
P = 2 × ( a + b ) P = 2 × ( + ) P = m (metre) |
Area of Rectangle Formula and Calculation |
A = a × b A = × A = m2 (square metre) |
Volume of Cuboid Formula and Calculation |
V = a × b × c V = × × V = m3 (cubic metre) |
Density of a Substance Formula and Calculation |
ρ = m/V ρ = / ρ = kg/m3 (kilogram per cubic metre) |
Pressure Formula and Calculation |
P = F/A P = / P = N/m2 (Newton per square metre) |
Average Velocity Formula and Calculation |
< v > = Δx/t < v > = / < v > = m/s (metre per second) |
Acceleration Formula and Calculation |
a = v - u/t a = - / a = m/s2 (metre per square second) |
Calculator Input Values |
Length of the 1st side of the figure (a) m [metre] |
Length of the 2nd side of the figure (b) m [metre] |
Length of the 3nd side of the figure (c) m [metre] |
Mass of the object (m) kg [kilogram] |
Perpendicular Force (F) N [newton] |
Displacement (Δx) m [metre] |
Time (t) s [second] |
Initial Velocity (u) m/s [metre per second] |
Final Velocity (v) m/s [metre per second] |
Volume of Substance (V) m3 [cubic metre] |
Please note that the formula for each calculation along with detailed calculations is shown further below this page. As you enter the specific factors of each significant figures calcualtion, the Significant Figures Calculator will automatically calculate the results and update the formula elements with each element of the significant figures calculation. You can then email or print this significant figures calculation as required for later use.
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Please provide a rating, it takes seconds and helps us to keep this resource free for all to use
Note that the Significant Figure Calculator uses inputs a, b and c for computation of triangle related formula and inputs a and b for rectangle related formula. The formula and computations will calculate for both metrics as the aim of this calculator is to illustrate the application of significant figures in the computation of Physics formula, not for specific geometric shape calculations which are available at the links mentioned above.
The Significant figures Calculator (also known as a Sig Fig Calculator) is provided in support of our Physics Tutorials which cover all categories of Physics, a list of the PHysics categories covered is available at the end of this page. The calculation of significant figures in Physics is particularly important, particularly when computing long math equations. This Sig-Fig Calculator will calculate:
These results will be used to find the following physical quantities:
The following rules are applied when dealing with significant figures in Physics and within the Significant Figure Calculator
a) First, all numbers must be written at the same unit - into the largest one
For example, if we have 4.2 dm + 1.7 cm we write 4.2 dm + 0.17 dm
b) Then, the sum is calculated as usual
c) The result is rounded to the number with the smallest decimal places. In our example, it must be rounded up to the nearest tenth of dm. Thus,
Even if there are more than two numbers, we use the same procedure.
Perimeter of a figure, the Resultant of two or more forces, displacements, velocities, etc.
The procedure is the same as for the addition.
a) First, all numbers must be written at the same unit - into the largest one. Then we continue with calculating the value.
For example, if we have
We notice the numbers are already written in the same unit. Therefore, we don't need to apply the first rule.
Now, we can calculate the result through a simple calculator,
b) and then we round the result at one decimal place to fit the least accurate measurement (the number with the least decimal places). Thus, we obtain
Even if there are more than two numbers, we use the same procedure.
Change in position (displacement), change in velocity, etc.
a) First, all numbers must be written at the same unit - into the largest one.
For example, if we have 25.3 cm × 5.2 dm we write 2.53 dm × 5.2 dm
b) Then we calculate the multiplication regularly
In our example, we have
c) The result is rounded to show as many decimal places as there are in the factor with the least decimal places × 2
In our example, the factor with the least decimal places is 5.2 cm. It has only 1 decimal place. Therefore, the result must contain 1 × 2 = 2 decimal places. Therefore, we obtain
If there are three factors in a multiplication (such as when calculating the volume of objects), the result must show as many decimal places as there are in the factor with the least decimal places × 3.
For example, if the dimensions of a cuboid are 5.3 cm × 11 dm × 25 mm, first they must be converted into the least accurate quantity, i.e. in decimetres and then we calculate the mathematical value of multiplication.
Therefore, we have
The factor with the least decimal places (11 dm) contains no decimal places. Therefore, the result must contain 0 × 3 = 0 decimal places.
Hence, the result written in the correct number of significant figures is
Area of a figure (with two factors), volume of objects (with three factors), work, kinetic energy, etc.
The procedure is identical as for multiplication. The only difference is that in division we cannot use more than two numbers (dividend and divisor).
Example: Power is calculated by dividing work and time. If work is 32.645 J and time is 5.8 s a normal calculator shows
However, we must write the result in 1 × 2 = 2 decimal places as time contains only one decimal place and therefore, the result must be written in two decimal places. Hence, we get
Velocity, acceleration, power, pressure, density, etc. You may also find the Exponents Calculator useful.
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