Aspect Ratio Calculator
Calculate the aspect ratio of any width and height, simplified to its lowest terms and as a decimal.
- Simplified ratio
- 16:9
Formula: ratio = w : h reduced by gcd(w, h)
About Aspect Ratio Calculator
Aspect Ratio Calculator is a free online calculator that gives you an instant, accurate result as you type. Calculate the aspect ratio of any width and height, simplified to its lowest terms and as a decimal.
The calculation uses the standard formula ratio = w : h reduced by gcd(w, h) and updates live with every change to the inputs. Everything runs client-side in your browser — fast, private, and free to use as often as you like.
1920×1080, 1280×720, and 3840×2160 all simplify to the same 16:9 aspect ratio.
Frequently Asked Questions
Is Aspect Ratio Calculator free to use?
Yes. Aspect Ratio Calculator is completely free, with no sign-up, no downloads, and no usage limits. You can use it as many times as you like on any device with a web browser.
How accurate is this calculator?
The calculator applies the standard formula (ratio = w : h reduced by gcd(w, h)) with full floating-point precision and rounds only the displayed result. For most practical purposes the results are exact.
Related Tools
Rhombus Calculator
Calculate the area, side length, and perimeter of a rhombus from its two diagonals.
Kite Calculator
Calculate the area of a kite from its two diagonals, plus its perimeter from the two pairs of sides.
Octagon Calculator
Calculate the area and perimeter of a regular octagon from its side length.
Heptagon Calculator
Calculate the area and perimeter of a regular heptagon (7-sided polygon) from its side length.
Nonagon Calculator
Calculate the area and perimeter of a regular nonagon (9-sided polygon) from its side length.
Decagon Calculator
Calculate the area and perimeter of a regular decagon (10-sided polygon) from its side length.