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Author

Jeff Beem

Jeff Beem

Lead Developer, CalcRegistry

Jeff Beem is the developer behind CalcRegistry. He spent nearly twelve years in the U.S. Navy before moving into software in 1999, and in the 26+ years since he has shipped lending, finance, marketing, collections, and legal-tech applications for companies including Cash Time, DriveTime, Leaf Software Solutions, SmarterHQ (now Wunderkind) and IPRO Tech. The financial calculators on this site reflect amortization and origination math he's worked with directly in production lending systems.

Away from the keyboard he shoots landscape photography. The photography calculators here started as passion projects for real trips. Much of his portfolio can be seen on Instagram.

He built CalcRegistry because most calculator sites are cluttered, slow, and have outdated appearances. He moves around a lot, but currently lives in Montréal.

In his own words

Financial calculators

The financial calculators are the ones I know from the inside. I spent years building the origination and amortization systems that auto lenders and mortgage companies run on, the same math that's in these tools.

I know what amortization actually looks like in a production lending system, and I built these to match that, not a textbook approximation.

Health & fitness calculators

My wife has a theory that I missed my calling in nutrition and bioscience. I have no credentials there, so take that for what it's worth, but I do read the primary sources, and the health tools here follow NHLBI and WHO guidance rather than whatever a generic formula site copied from somewhere.

The BMI, calorie, and TDEE calculators cite the specific publications they're built from.

Photography calculators

I shoot landscape photography in the field: neutral-density long exposures, night sky, timelapse planning, and sizing prints from real files. The photography tools on CalcRegistry are the ones I reach for on a tripod or before ordering a print.

I'm not an optical engineer or a lab tester. Where a rule has a published definition (500 rule, NPF, standard ND stop math), the calculator follows that source and says so on the page. For depth of field and crop factor, the math matches the usual thin-lens and sensor-size conventions you'll see in camera manuals.

Calculators

Tools I build and maintain on CalcRegistry.

Fitness & health

Photography

Find me

About CalcRegistry explains how the site works, our privacy model, and why calculations run in your browser.