Built for speed, privacy and flexibility
A polished calculator engine with the admin tools you need to run it.
30 working calculators
Body composition, energy, heart rate, strength, running, walking and pregnancy calculators — real formulas, instant results.
Instant AJAX results
Results are computed by a lightweight call to your own site. Fast, private and free of external services.
Metric & Imperial toggle
Visitors switch kg↔lb and cm↔ft/in without reloading the page.
Live-search directory
A hub page that filters all calculators as the visitor types.
Calculator Manager
Enable or disable any calculator from the WordPress admin.
Calculator Explorer
An admin-only playground with a live chart to test every calculator with sample inputs.
Page-builder friendly
Works with Gutenberg, Elementor, WPBakery, Divi, Bricks, Oxygen and the Classic Editor.
Simple shortcodes
Directory, single calculator and toolkit shortcodes cover every use case.
RTL & responsive
Arabic and Urdu switch to a right-to-left layout automatically; the UI adapts to any screen.
No API key. No tracking. No surprises.
Everything runs locally on your WordPress site with zero external calls, and tracker data stays in the visitor’s own browser.
- No third-party service or subscription
- No API keys to manage or leak
- Educational estimates, clearly labelled
See it working on your own site
Install FitNFO Lite free and try every calculator in minutes.