Ratio Calc - Aspect Ratio Tool

RatioCalc is a fast, clean aspect ratio calculator for designers, photographers, and video creators. Enter any 3 of the 4 values in A:B = C:D and the last one calculates instantly. A live rectangle preview shows the proportions with diagonal angles at a glance. FEATURES · Real-time visual rectangle preview · Diagonal angles displayed automatically · 14 presets: Golden Ratio, Silver Ratio, A4, B4, 16:9, 21:9, 16:10, Cinema Flat, Cinema Scope, and more · Calculation history Great for scaling images, checking screen ratios, and verifying print dimensions.