Solve proportions with three known values. Find the missing value in a:b = c:d ratio equations. Everything runs locally in your browser — nothing is uploaded.
Calculate the aspect ratio from width and height dimensions. Find the simplified W:H ratio for images, videos, and screens.
Simplify ratios to their lowest terms. Enter two numbers to find the simplest whole-number ratio between them.
Projects customer lifetime value using average order value, purchase frequency, gross margin, and estimated customer lifespan in months. SaaS founders and e-commerce operators use LTV to determine acquisition budgets, segment high-value customers, and forecast recurring revenue.
Find the ISO week number for any date. Also shows the day of the week and the current week of the year.
Find the midpoint between any two coordinates on a 2D grid. Shows the calculated midpoint coordinates with a visual reference.
Proportion Calculator lets you solve proportions with three known values. Find the missing value in a:b = c:d ratio equations. Everything runs locally in your browser — nothing is uploaded.. It works on any device with a modern web browser.
Solve proportions with three known values. Find the missing value in a:b = c:d ratio equations. Everything runs locally in your browser — nothing is uploaded. It runs entirely in your browser — no software installation or data uploads required.
Direct text entry, file upload, or URL-based input — depending on the tool. All numeric values are entered through input fields with real-time updates.
Yes. After the initial page load, Proportion Calculator runs entirely on your device with no internet connection needed. All processing is done locally.
Yes, this tool is completely free with no usage limits, registration, or credit card required.
All processing happens locally in your browser. Your data is never uploaded to any server.
Yes. After the initial page load, the tool runs entirely offline without requiring an internet connection.
No. You can use this tool unlimited times with no quotas or restrictions.
Any modern web browser (Chrome, Firefox, Safari, Edge) on desktop or mobile. No installation needed.
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