Free Scale Modelling Calculators
Free calculators for scale modellers, railway enthusiasts, RC builders, wargamers and diorama artists. Fast, accurate, no signup required.
Scale Conversion
Convert real-world measurements to any model scale and back. Compare scales, calculate speed, weight, area and volume at scale.
11 calculators â
Paint & Finishing
Mix paints accurately, calculate thinning ratios, airbrush settings, spray coverage and weathering quantities for perfect model finishes.
16 calculators â
Plastic Kits
Plan your plastic kit builds with calculators for glue, filler, decals, rigging, photo-etch and build time estimation.
11 calculators â
Railway Modelling
Essential calculators for model railway layouts â track, curves, gradients, platforms, bridges, signals and baseboards.
12 calculators â
RC Models
Radio-controlled model calculators for batteries, motors, ESCs, gearing, servos, wing loading, propellers and flight time.
10 calculators â
Diorama
Plan dioramas with calculators for base sizing, terrain, vegetation, water effects, lighting, figure placement and materials.
10 calculators â
Miniatures & Wargaming
Wargaming calculators for army points, paint pots, basing, movement trays, dice odds, range rulers and army costs.
12 calculators â
Scratch Building
Calculators for scratch builders â sheet thickness, rod and tube sizing, templates, structural strength, rivets and panel lines.
8 calculators â
Tools & Equipment
Find the right tools â drill bit sizes, blade selection, magnification power, lighting setups, cutting mats and compressor settings.
8 calculators â
Model Maths
Planning and budgeting calculators â material costs, build time, collection value, display cases, shipping and competition scoring.
9 calculators â
Rigging & Detail
Calculate thread lengths, wire gauges, rigging point placement and attachment details for model aircraft, ships and helicopters.
1 calculators â
Track & Scenery
Calculate ballast quantities, scenic materials and trackbed dimensions for model railway scenery.
1 calculators â
Reference
Useful reference guides and charts for model scales, paints, adhesives and railway modelling.
4 guides â
ModelCalcs â Free Scale Modelling Calculators
ModelCalcs provides 109+ free calculators built specifically for scale modellers, railway enthusiasts, RC builders, wargamers and diorama artists. Convert measurements across all common scales from 1:6 to 1:700, mix paints to precise ratios, plan track layouts, size batteries and motors, and estimate material quantities â all without signup.
Whether you are building a 1:72 aircraft kit, laying OO gauge track, scratch-building a structure from styrene sheet, or painting a Warhammer army, our calculators handle the maths so you can focus on the hobby. Every tool gives instant results with clear breakdowns you can copy and share.
Browse all 109+ calculators or search above to find exactly what you need.