Transform complex construction math into simple solutions. HammerCalc is the only calculator built specifically for professionals who work with mixed units, fractions, and real-world measurements. Includes suite of specialized tools, notes system, plan viewer & much more.

Why professionals choose HammerCalc:

Multi-Unit Math Made Easy
• Mix feet, inches, millimeters, and meters in a single calculation. No more converting units or switching between calculators. Just enter your measurements naturally and get instant, accurate results.

Built for Speed
• Tape Measure Widget - Input fractions faster than typing
• Custom fraction rounding (1/16", 1/32", 1/64", or decimal)
• Pin your most-used tools for one-tap access
• Quick Links for instant access to your favorite resources

Specialized Professional Tools
• Square Footage - Area calculations
• Stair Calculator - Rise, run, stringers, and code compliance
• Rafter Calculator - Ridge height, cuts, and angles
• Roof Calculator - Pitch, rise, run, and rafter lengths
• Circle & Arc Layout - Radius, chord, segments, and angles
• Triangle & Polygon - Right triangles, oblique angles, regular polygons
• Square Footage - Area calculations
• Rectangle Layout - Dimensions, diagonals, and squaring

What-If Controls & Visual Diagrams
• Every tool includes interactive sliders and visual references that update in real-time

Integrated Plan Viewer
• Load PDFs directly in the app - no more switching between apps
• Auto-saves zoom level, page number, and position for each plan for quick referencing between plans and calculator
• Work with multiple plans simultaneously

Notes System
• Add calculations directly to notes with one tap
• Create unlimited notes for different projects
• Full calculation history with timestamps

Professional Features
• Mix decimals and fractions in any calculation
• Dark mode for low-light job sites
• Customizable theme colors
• Imperial, Metric, or Mixed unit modes
• Lock key parameters while exploring options
• Converts results between units with one tap

Perfect For:
Carpenters • Contractors • Engineers • Machinists • Architects • Designers • Estimators • Inspectors • Anyone who works with precise measurements

Risk-Free 7 Day Trial
Try our professional calculator free for 7 days. No commitment required.

Note: A subscription is required to access HammerCalc’s features after the trial. Pricing and availability vary by region.

Subscription Details
7-Day Free Trial: Unlock the power of HammerCalc for free for 7 days, then choose US$3.99/month or US$24.99/year in the US (pricing varies by region)
Auto-Renewal: Automatically renews unless canceled 24 hours before the trial or billing period ends.
Manage Subscription: Adjust or cancel anytime in Settings > [Your Apple ID] > Subscriptions.

Support: Contact us at hammercalc@gmail.com for help.

This app is subject to our Terms of Use, available at: https://www.hammerstorm.co/terms
To view our privacy policy, please visit: https://www.hammerstorm.co/privacy