Free
$0forever
Core structural calculators — no account needed.
Beam Calculator
Unit Converter
Rebar Calculator
SI + Imperial units
Eurocode + ACI support
Forever free
Most Popular
Pro
$49/ year
Professional-grade design calculators for real projects.
Everything in Free
RC Beam Design Calculator
RC Slab Design Calculator
RC Column Design Calculator
Steel Beam Design Calculator
Foundation Design Calculator
Priority support
FAQ
Common questions
The Free plan includes the Beam Calculator, Unit Converter, and Rebar Calculator — with full Eurocode and ACI support in both SI and Imperial units. No account required.
Yes. You can switch between billing cycles at any time. When upgrading to yearly, you get the equivalent of 7 months free.
All Pro tools support Eurocode (EC2/EC3) and ACI (318), with toggleable SI and Imperial unit systems.
Absolutely. Cancel your subscription at any time — no long-term contracts, no hidden fees.