Video// 0.1ms • 100% Local
100% IN-BROWSER WORKSTATION
Video Aspect Ratio Calculator
Broadcast and cinema framing calculator: anamorphic, DCI 4K, IMAX, and letterboxing.
FRA
Video Aspect Ratio Calculator
videoNO SIGN-UPBroadcast and cinema framing calculator: anamorphic, DCI 4K, IMAX, and letterboxing.
0.1ms100% LocalO(1)
TIMELINE CANVAS RESOLUTION1.78:1 Base
CANVAS WIDTH:
CANVAS HEIGHT:
TARGET MATTE ASPECT RATIO:
:
DELIVERY ACTIVE PICTURE:3840 × 1607 px
LETTERBOX BARS:277 px top & bottom
CINEMATIC ASPECT RATIO PRESETSINDUSTRY STANDARDS
ACTION SAFE (90%)
TITLE SAFE (80%)
9:16 REELSSAFE CENTER
LETTERBOX (277px)
LETTERBOX (277px)
3840 × 1607
2.39:1 Delivery Scope
ACTIVE FRAME: 3840 × 1607 PX•SMPTE EBU BROADCAST COMPLIANT•MATTE LETTERBOX
NLE TIMELINE RESOLUTION SETTINGSDAVINCI / PREMIERE / FCP
CUSTOM TIMELINE RESOLUTION:COPY
3840 × 1607Set Timeline Format to Custom in Project SettingsPIXEL ASPECT RATIO (PAR):COPY
Square (1.0)Standard square progressive pixelsTIP: USE 9:16 SOCIAL REELS SAFE BOX TO ENSURE TALKING HEADS FIT TIKTOK / SHORTS•CALCULATES EXACT NLE TIMELINE DELIVERY DIMENSIONS
100% IN-BROWSER CINEMA MATHEMATICS
RAM-ONLY ENGINE•OUTBOUND HTTP REQUESTS: 0•ZERO TELEMETRY
NO CREDENTIALS REQUIRED
VERIFIABLE CLIENT-SIDE PRIVACY CONTRACT
INSPECT VIA BROWSER DEVTOOLS NETWORK TAB (0 BYTES TRANSMITTED)Zero Sign-Up FrictionNo email, no phone verification, no password creation. Start working immediately.
Zero Cloud ExposureYour files, calculations, or tokens remain exclusively in your computer's active RAM.
Instant 0ms ResponsivenessNo AI queues, no rate-limiting, and no cloud processing delays.
HOW TO USE THE VIDEO ASPECT RATIO CALCULATORDIRECT WORKFLOW
GUIDE
1
Specify your sensor resolution or target delivery canvas.
2
Choose from industry-standard cinematic framing aspect ratios.
3
Calculate top and bottom letterbox matte pixel heights.
TECHNICAL SPECIFICATIONS & PERFORMANCEENGINE TELEMETRY
VERIFIED
EXECUTION SPEED:0.1ms (Instant local)
SECURITY LEVEL:100% Local
NATIVE SUBSYSTEM:O(1)
Supports DCI 4K (4096x2160), Scope (2.39:1), and Flat (1.85:1).
Essential for colorists and video editors applying matte bars.
Instant mathematical breakdown.
FREQUENTLY ASKED QUESTIONSPRIVACY & PROTOCOL SPECS
FAQ
What is the standard widescreen cinema aspect ratio?
Modern widescreen cinema typically uses either 2.39:1 (anamorphic scope) or 1.85:1 (standard flat widescreen).
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