Calculate missing width or height while preserving an aspect ratio, or simplify width and height to a ratio.
Risk planning tool
Enter the values, check the assumptions, and leave with a number you can put directly into a plan or journal.
Enter the numbers, units, dates, or scores.
Review the primary value and the assumption that produced it.
Copy the result into the next plan, note, or Studio step.
Review the calculated value and supporting breakdown.
Privacy: This tool runs entirely in your browser. No data is sent to our servers. We don't store, share, or have access to any of the information you process here.
Inputs and result
Use the result area as the copy-ready handoff for the next step in your work.
Use Aspect Ratio Calculator when you need to calculate missing width or height while preserving an aspect ratio, or simplify width and height to a ratio.
Inputs stay simple and results are shown immediately in a copyable format.
A: Yes. Enter a ratio and one dimension; the other dimension is calculated instantly.
A: Yes, width and height can be reduced to their simplest integer ratio.
Resize images to exact dimensions or scale by percentage. Includes common presets for web and print.
Create a 1280 x 720 thumbnail with background image, title text, safe margins, and PNG download.
Look up common image sizes for X, LinkedIn, YouTube, Instagram, Facebook, TikTok, and Pinterest.
Calculate percentages, percentage change, discounts, markups, and what percent one number is of another.
Calculate exact age from a birth date in years, months, days, and next birthday timing.
Find days, weeks, months, and years between two dates.
Count weekdays between dates and optionally exclude custom holiday dates.
Calculate body mass index from metric or US units with category guidance.
Estimate monthly payments, total interest, and amortization basics for fixed-rate loans.
Privacy: This tool runs entirely in your browser. No data is sent to our servers. We don't store, share, or have access to any of the information you process here.