Builder Tools · Stevens Aeromodel

English ↔ Metric Conversion Calculator

For builders who think in inches, ounces, and miles per hour — and need to talk to the rest of the world.

Use this tool to convert any common measurement encountered in RC building — wingspan, weight, wing area, speed, servo torque, temperature, or covering film weight — between English and metric units. Pick a category tab, choose your units in each column, then type a value in either field. The other side updates live.

English to metric conversion reference showing ruler, X-Acto knife, and aircraft drawings










Result: 1 Inch = 25.4 Millimeter

About this tool

RC modeling is a delightfully international hobby. Kits are often spec’d in inches and ounces while motors, servos, batteries, and props show up labeled in millimeters, grams, and kg-cm. This converter handles the conversions you actually reach for at the workbench. For the formulas behind wing loading, watts-per-pound, prop pitch, and CG, visit the Learn It! Build It! Fly It! builder’s roadmap.

More Builder Tools and Articles

This converter is part of the Stevens AeroModel builder tools collection — calculators and references that complement the Learn It! Build It! Fly It! article library.

For the technical articles that explain the math behind the numbers, visit the Builder’s Roadmap — in-depth guides on power systems, propeller matching, preflight inspection, CG setup, and more.

Stevens Aeromodel · Builder Resources

Learn It! Build It! Fly It!

Laser-cut balsa kits made in Colorado — for builders who want to understand every part of what they’re flying.