Plan video, audio, image, social media, and digital marketing projects with free browser-based calculators. OutputMath shows the formulas, units, assumptions, and worked examples behind each result, so you can verify the calculation instead of relying on an unexplained number.
Use a calculator immediately, explore tools by category, or read a detailed guide to understand how a calculation works.
Start with a Popular Calculator
Video File Size Calculator
Estimate video storage from duration and bitrate, or calculate the bitrate required to fit a video within a target file size. The calculator supports common time and data units and explains why actual encoded files may differ from a mathematical estimate.
Audio File Size Calculator
Calculate compressed audio size from bitrate and duration, or estimate uncompressed PCM and WAV storage using sample rate, bit depth, channel count, and recording length.
Aspect Ratio Calculator
Simplify an aspect ratio, calculate a missing width or height, compare two dimensions, and find proportional sizes without stretching the image or video.
DPI and PPI Calculator
Convert between pixel dimensions, physical print size, DPI, and PPI. Use it to estimate the resolution required for a print or the effective pixel density of an image placed at a specific size.
CTR Calculator
Calculate click-through rate from clicks and impressions. You can also reverse the formula to estimate required clicks or impressions for a target CTR.
Conversion Rate Calculator
Calculate conversion rate, expected conversions, or required traffic. The result describes the mathematical relationship between the values entered and does not predict future campaign performance.
Browse Calculators by Category
Video & Streaming
Calculate video file size, bitrate, upload and download time, frame count, timecode, streaming bandwidth, data usage, storage requirements, and related production values.
Audio & Podcasting
Estimate audio file size, PCM and WAV storage, recording capacity, podcast bandwidth, sample count, data rate, speech duration, and loudness adjustments.
Images & Design
Work with aspect ratios, proportional dimensions, image resolution, compression, PPI, DPI, print size, bleed, crop requirements, pixel count, storage estimates, and image scaling.
Social Media
Measure engagement rate, follower growth, video completion rate, view rate, cost per view, watch hours, shares, saves, comments, and subscriber conversion.
Marketing & Planning
Calculate CPM, CTR, CPC, CPA, conversion rate, ROAS, ACOS, ad frequency, campaign cost, required traffic, and performance targets from supplied metrics.
More Than a Final Number
A useful calculator should make its result understandable and reproducible. OutputMath tools are designed to provide supporting information such as:
- The formula used
- Clearly defined input units
- Converted values
- Intermediate calculations
- Practical rounding
- Reverse-calculation modes
- Input validation
- Assumptions and limitations
- Related calculators and guides
The exact information displayed varies by calculator. When an estimate can differ from a real-world result, the relevant page explains the main reasons for that difference.
How We Review Calculations
The OutputMath Editorial Team reviews calculator formulas, units, input requirements, and expected outputs before publication or a material update.
Testing may include manually calculated reference examples, decimal inputs, unit conversions, zero and empty values, boundary values, reverse calculations, rounding behavior, and mobile display checks.
A calculator is not considered accurate merely because it produces a number. The inputs must be defined correctly, the units must remain consistent, and the output must represent the formula described on the page.
Read the Calculation Methodology for more information about how formulas and calculator behavior are checked.
Understand the Formula with Practical Guides
OutputMath guides explain how to perform calculations manually and how to interpret the results. Depending on the subject, a guide may include formula definitions, worked examples, comparison tables, reverse calculations, unit conversions, common mistakes, planning scenarios, and limitations.
Stable mathematical relationships are separated from platform specifications or recommended settings that can change over time. When a calculation depends on an external service, format, or production requirement, confirm critical values with the relevant current documentation.
Browse all calculation guides on the Guides page.
Privacy-Friendly Browser-Based Tools
Calculator entries are processed in the visitor’s browser unless a specific tool clearly states otherwise. This allows many calculations to be completed without submitting project values to OutputMath.
Advertising services, analytics, cookies, and other third-party processing are explained separately in the Privacy Policy and Cookie Policy.
Accuracy, Estimates, and Limitations
Some outputs are exact mathematical results based on the supplied values. Others are estimates whose real-world accuracy depends on additional conditions.
For example:
- Compressed file sizes can vary because of variable bitrate, encoder behavior, metadata, and container overhead.
- Upload and download times can vary because of protocol overhead, congestion, server limits, and connection stability.
- Print requirements can vary according to the printer, paper, viewing distance, finishing process, and production specification.
- Advertising and social media calculations describe relationships between supplied metrics but cannot guarantee future results.
- Platform definitions, reporting methods, and technical recommendations may change.
Each calculator or guide should be read together with its stated assumptions and limitations.
Explore OutputMath
Browse the Calculators page to see every available tool, or visit the Guides page for formulas, worked examples, and planning explanations.
To learn how OutputMath creates and reviews its content, read About OutputMath and the Calculation Methodology.
If you find a possible error, include the page URL, values entered, displayed result, expected result, and units when contacting us. Confirmed calculation or explanation errors are reviewed under the Corrections Policy.