ScaleMate: Model Scale Calc

Measure on photos, use your screen as a scale ruler, convert real sizes to any scale and plan projects with cut lists. For model railways, plastic kits, dioramas, dollhouses, tabletop miniatures and architectural models. Example: 4.8 m in real life is 100 mm at 1:48.

MEASURE
• Measure directly on a photo using one known length; name and save any number of measurements
• Share the marked photo or add its measurements to a project as parts
• Use the iPhone screen as a scale ruler and calibrate it with a card
• Choose common reference objects when finding an unknown scale

CONVERT
• Real to model and model to real
• mm, cm, m, inches and feet, with inch fractions next to the decimal value
• Length × width × height in one step
• Compare one measurement across several scales side by side
• Scale to scale: convert 1:72 to 1:48 and read the enlargement percent for a photocopier or your 3D-print slicer (1:72 → 1:48 = 150 %)
• Find the scale: enter one real and one model measurement and get the nearest named scale plus the deviation

SCALES AND GAUGES BY NAME
Searchable picker with favorites and recents:
• Railway: Z, N, N (UK), TT, H0/HO, OO, S, 0, O, 1, G
• Figures: 6, 15, 20, 28 and 54 mm
• Kits: 1:6 to 1:700
• Dollhouse: 1:12, 1:24, 1:48, 1:144
• Architecture: 1:20 to 1:1000 and imperial such as 1/4" = 1'
• Custom scales (1:n) for everything else

PROJECTS
• Projects with parts lists, groups, materials and notes
• Cut lists with CSV and PDF export
• Calculation history

ONE PURCHASE, EVERYTHING INCLUDED
Everything is included with your purchase: no subscription, no in-app purchases, no account, no ads, no tracking. ScaleMate works offline. Your calculations and projects stay on your device, and files are only shared when you export them yourself. Dark mode. Interface in 12 languages that follows your device language. Made for iPhone.

ScaleMate is a calculation and organization aid. Results do not replace professional construction, material or safety advice.