Sixteen answers,
before they finish asking.
How many stops of ND? What's the hyperfocal at T2.8? Will the card hold another hour at 4K ProRes? Set Math answers the questions that stop a unit mid-setup — sixteen calculators, one search field, no signal required and no ads in the way.
All sixteen, in the order you'll reach for them.
Version 2.0 added six: exposure triangle, field of view, aspect ratio, hyperfocal distance, aperture/T-stop and colour temperature.
Exposure
- ND Calculatorstops needed to hold your stop and shutter
- Shutter Calculatorangle, speed and frame rate together
- Exposure Triangletrade ISO, aperture and shutter, see the cost
- EV / Lightingexposure values and lighting levels
- Aperture / T-Stopf-stop against true transmission
- Colour TemperatureKelvin, mireds and correction
Lens & framing
- Depth of Fieldnear, far and total, per sensor
- Hyperfocal Distancewhere to sit focus for maximum depth
- Field of Viewwhat a focal length actually covers
- Aspect Ratioletterbox, pillarbox and safe areas
- Crop Helpercrop factor across sensor sizes
Data & time
- Data Ratewhat a codec costs per minute
- Runtimehow long a card or drive lasts
- Frame Rateplayback, conversion and speed ramps
- Timecodeadd, subtract and convert across rates
- Unit Converterfeet, metres, inches, millimetres
Before you download.
Is it free, or free-with-something?
Free. No ads, no subscription, no account, no upsell screen between you and the answer. It exists because we needed it on our own sets.
Does it work with no signal?
Completely. Every calculation runs on the device — which matters, because the places that need a card runtime figure are usually the places with no bars.
How is this different from DOPro?
Set Math is only the numbers, and it's free. DOPro is the department: director's viewfinder, digital slate, lighting diagrams, sun tracker, shot lists and location scouting, with its own calculators underneath. If you just need the maths, this is it.
Can I choose which tools show first?
Yes — star your favourites and they move to the top, so the two you use forty times a day aren't buried behind fourteen you don't.
Sixteen tools. No ads. No cost.
The maths a unit needs, in the time it takes to unlock a phone.