# Aspect ratio calculator (16:9, 4:3, 21:9)

> Find the aspect ratio of any resolution, such as 1920 × 1080 = 16:9, resize it to a new width or height, or fit it in a screen with letterbox bars.

സംവേദനാത്മക പതിപ്പ്: https://www.calcopenly.com/ml/programming/aspect-ratio-resolution-calculator
വിഷയം: പ്രോഗ്രാമിങ്ങും സാങ്കേതികവിദ്യയും കാൽക്കുലേറ്ററുകൾ

The aspect ratio is the width divided by the height, written in lowest terms by dividing both sides by their greatest common divisor: 1920 ÷ 120 = 16 and 1080 ÷ 120 = 9, so 1920 × 1080 is 16:9. Resizing keeps that quotient fixed, so the new height is the new width × H ÷ W. Fitting a picture inside another frame uses the largest scale that fits both ways, s = min(frame width ÷ W, frame height ÷ H), and the leftover space becomes bars.

Scaling 1920 × 1080 to 1280 wide gives 1280 × 720. Showing that 16:9 picture on a 1024 × 768 screen gives a 1024 × 576 picture with 96 px letterbox bars above and below, so the picture uses 75% of the screen.

Sizes stay exact fractions until the end. Scaled sizes are then rounded to whole pixels, which can shift the ratio slightly.

## ഇൻപുട്ടുകൾ

- **I want to** (തിരഞ്ഞെടുപ്പുകൾ: Find the ratio, Resize keeping the ratio, Fit inside another frame)
- **Source ratio** (തിരഞ്ഞെടുപ്പുകൾ: Use the width and height below, 16:9 (HD video, most monitors), 4:3 (older TVs, iPad), 21:9 (ultrawide, as marketed), 9:16 (vertical phone video), 1:1 (square), 3:2 (35 mm photo), 16:10 (laptops), 4:5 (portrait social post), 1.85:1 (flat cinema), 2.39:1 (scope cinema), 32:9 (super ultrawide))
- **വീതി**
- **ഉയരം**
- **New size is given as** (തിരഞ്ഞെടുപ്പുകൾ: വീതി, ഉയരം)
- **New width or height**
- **Frame width**
- **Frame height**

## ഫലങ്ങൾ

- ഫലം
- Simplified ratio — പ്രധാന ഫലം
- Width ÷ height
- Closest common ratio
- New width (px)
- New height (px)
- Picture width in frame (px)
- Picture height in frame (px)
- Bars
- Each bar (px)
- Frame area used by the picture

## സൂത്രവാക്യം

$$
\begin{aligned} W{:}H &= \frac{W}{\gcd(W,H)} : \frac{H}{\gcd(W,H)} \\[4pt] s &= \min\!\left(\frac{W_f}{W}, \frac{H_f}{H}\right)\end{aligned}
$$

## പരിഹരിച്ച ഉദാഹരണങ്ങൾ

### Full HD

- I want to: Find the ratio
- വീതി: 1920 px
- ഉയരം: 1080 px
- **Simplified ratio: 16:9**
- **Width ÷ height: 1.7778**
- **Closest common ratio: 16:9**
- പരിശോധനയുടെ ഉറവിടം: Python 3.8: fractions.Fraction(1920, 1080) = 16/9

### Ultrawide 2560 × 1080

- I want to: Find the ratio
- വീതി: 2560 px
- ഉയരം: 1080 px
- **Simplified ratio: 64:27**
- **Width ÷ height: 2.3704**
- പരിശോധനയുടെ ഉറവിടം: Python 3.8: fractions.Fraction(2560, 1080) = 64/27 = 2.37037…

### 1366 × 768 laptop is not exactly 16:9 (edge)

- I want to: Find the ratio
- വീതി: 1366 px
- ഉയരം: 768 px
- **Simplified ratio: 683:384**
- **Width ÷ height: 1.7786**
- **Closest common ratio: 16:9 (0.05% wider)**
- പരിശോധനയുടെ ഉറവിടം: Python 3.8: Fraction(1366, 768) = 683/384; (683/384) / (16/9) − 1 = 0.0488%

### Decimal cinema ratio

- I want to: Find the ratio
- വീതി: 2.39 px
- ഉയരം: 1 px
- **Simplified ratio: 239:100**
- പരിശോധനയുടെ ഉറവിടം: Python 3.8: Fraction('2.39') / 1 = 239/100

### Scale 1920 × 1080 to 1280 wide

- I want to: Resize keeping the ratio
- Source ratio: Use the width and height below
- വീതി: 1920 px
- ഉയരം: 1080 px
- New size is given as: വീതി
- New width or height: 1280 px
- **New width: 1,280 px**
- **New height: 720 px**
- **ഫലം: 1280 × 720 px**
- പരിശോധനയുടെ ഉറവിടം: Python 3.8: 1280 × Fraction(1080, 1920) = 720

### 4:3 at 1080 tall

- I want to: Resize keeping the ratio
- Source ratio: 4:3 (older TVs, iPad)
- New size is given as: ഉയരം
- New width or height: 1080 px
- **New width: 1,440 px**
- **New height: 1,080 px**
- പരിശോധനയുടെ ഉറവിടം: Python 3.8: 1080 × Fraction(4, 3) = 1440

## ചോദ്യങ്ങൾ

### What is the aspect ratio of 1920 × 1080?

1920 × 1080 is 16:9: both sides divide by their greatest common divisor, 120, to give 16 and 9, and the width is 1.7778 times the height. ITU-R BT.709 defines 1920 × 1080 as the HDTV picture format, and the same 16:9 shape covers 1280 × 720, 2560 × 1440 and 3840 × 2160 (4K UHD).

### Is a 21:9 ultrawide monitor really 21:9?

No. Ultrawide monitors sold as 21:9 are 2560 × 1080 (64:27, 2.370), 3440 × 1440 (43:18, 2.389) or 3840 × 1600 (12:5, 2.4), while 21:9 itself is 2.333. The label is rounded marketing, and the gap shows up in practice: true 21:9 video on a 3440 × 1440 panel fills 3360 × 1440 and leaves a 40 px pillarbox bar on each side.

### How do I calculate the new height when resizing an image?

Multiply the new width by the original height over the original width: new height = new width × H ÷ W. Scaling 1920 × 1080 to 1280 wide gives 1280 × 1080 ÷ 1920 = 720. The other way round, new width = new height × W ÷ H, so a 4:3 picture 1080 tall is 1440 wide. Round to whole pixels at the end, and to even numbers for most video encoders.

### What is the difference between letterbox and pillarbox?

Letterboxing adds bars above and below when the picture is wider than the screen, such as 16:9 video on a 1024 × 768 display, which gets 96 px bars. Pillarboxing adds bars on the left and right when the picture is narrower, such as 4:3 content on a 1920 × 1080 screen, which leaves 240 px on each side. Zooming to fill removes the bars but crops the picture, by 25% in that 4:3 case.

### What aspect ratios do cinema films use?

Digital cinema uses two DCI container shapes: flat at 1.85:1 (1998 × 1080 in the 2K container) and scope at 2.39:1 (2048 × 858). On a 1920 × 1080 TV, a 2.39:1 film shows letterbox bars of about 138 px above and below, and a 1.85:1 film bars of about 21 px, because both are wider than the TV's 16:9 (1.78:1).

### “Aspect ratio calculator (16:9, 4:3, 21:9)” എത്രത്തോളം കൃത്യമാണ്?

കൃത്യത നിങ്ങളുടെ ഇൻപുട്ടുകളെയും രീതിയുടെ അനുമാനങ്ങളെയും ആശ്രയിച്ചിരിക്കുന്നു. ദശാംശ ഗണിതം 50 സാർഥക അക്കങ്ങൾ ഉപയോഗിക്കുന്നു. എന്നാൽ അനുമാനക്കണക്കുകൾ, സംഖ്യാത്മക രീതികൾ, ഉറവിട ഡാറ്റ എന്നിവയ്ക്ക് കൃത്യത കുറവാകാം; പ്രദർശിപ്പിക്കുന്ന മൂല്യം റൗണ്ട് ചെയ്യുന്നത് ഈ പരിമിതികൾ നീക്കില്ല. സ്വതന്ത്ര ഉറവിടങ്ങളിലെ പരിഹാരങ്ങളുമായി പരിശോധിച്ച ഉദാഹരണങ്ങൾ: 9. ഉദാഹരണത്തിന്, “Full HD” എന്നത് Python 3.8: fractions.Fraction(1920, 1080) = 16/9 ഉപയോഗിച്ച് പരിശോധിക്കുന്നു.

### ഈ രീതിയുടെ ഉറവിടം എന്താണ്?

ITU-R BT.709-6 — HDTV picture format 1920 × 1080 at 16:9; DCI Digital Cinema System Specification — flat 1998 × 1080 (1.85:1) and scope 2048 × 858 (2.39:1) containers.

## സ്രോതസ്സുകൾ

- [ITU-R BT.709-6 — HDTV picture format 1920 × 1080 at 16:9](https://www.itu.int/rec/R-REC-BT.709)
- [DCI Digital Cinema System Specification — flat 1998 × 1080 (1.85:1) and scope 2048 × 858 (2.39:1) containers](https://www.dcimovies.com/specification)