Cross Multiplication
The #1 Cross Multiplication Calculator for
Solve scale ratios, battery percentages, and complex proportions instantly. Accuracy without the mental gymnastics.
TRY FOR FREE
No credit card required
Stop Guessing. Start Calculating.
Mental math is great until it isn’t. Calculating resizing scales, converting recipes, or figuring out price-per-unit often leads to errors that cost time and money.
- No more confusing formulas
- Eliminate rounding errors
- Instant results as you type
Who is this for?
We built this for anyone who needs precision in their daily tasks.
See It In Action
A clean, distraction-free interface with built-in presets for common scenarios.
Powerful Features
Everything you need to solve proportions fast.
Real-Time Calc
Results appear instantly as you type numbers. No “Calculate” button needed.
Smart Presets
One-click loading for Battery %, Scale Ratios, and Price/Quantity scenarios.
Adaptive Theme
Automatically matches your system preference for Light or Dark mode.
Mobile Ready
Fully responsive design works perfectly on phones, tablets, and desktops.
Frequently Asked Questions
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