FitCalc vs Omni Calculator: Fitness Calculators Compared (2026)
Omni Calculator is genuinely impressive — over 3,800 calculators across every domain imaginable, with thoughtful formula explanations and active development. Their health and fitness section is solid. FitCalc takes a different approach: fewer tools, all focused on fitness, with an interface built for people who want to get their number and move on. Both are good. The question is whether you want breadth or focus.
Feature Comparison
| Feature | FitCalc | Omni Calculator |
|---|---|---|
| BMI calculator | Yes | Yes — with extensive explanation |
| TDEE / calorie calculator | Yes — multiple formulas | Yes — detailed with activity breakdowns |
| 1 Rep Max calculator | Yes — multiple formulas | Yes — Epley and others |
| Heart rate zones | Yes — Karvonen method | Yes — multiple zone systems |
| Sleep cycle calculator | Yes | Sleep calculator available |
| Formula explanations | Concise context per calculator | ✓ Detailed with derivations and examples |
| Ads | ✓ Minimal | Display ads support the project |
| Non-fitness calculators | Not available | ✓ 3,800+ covering science, math, finance, cooking |
| Page speed | ✓ Fast | Reasonable |
| Macro ratio customization | ✓ Yes | Basic macros available |
Where FitCalc wins
- ✓ Focused fitness experience — no searching through 3,800 tools
- ✓ Faster to load with minimal ad overhead
- ✓ Macro ratio customization for specific diet protocols
- ✓ Streamlined interface for quick fitness calculations
Where Omni Calculator wins
- ✓ 3,800+ calculators spanning every imaginable topic
- ✓ More detailed formula explanations and educational content
- ✓ Science, physics, chemistry, and math calculators
- ✓ Active community and new calculators added regularly
- ✓ More extensive health sub-calculators (pregnancy, medication, pediatric)
The Verdict
Omni Calculator is a legitimately excellent tool with impressive depth and breadth. For fitness calculations, both sites cover the essentials well. FitCalc's advantage is focus and speed — it's built for fitness and nothing else, so the interface is cleaner for that purpose. If you need calculators beyond fitness, Omni is the clear choice. If fitness is all you need, either works well.
Frequently Asked Questions
Is Omni Calculator free?
Yes, Omni Calculator is free and ad-supported. FitCalc is also free with minimal advertising.
Which has better formula explanations?
Omni Calculator typically provides more detailed educational content with formula derivations. FitCalc focuses on getting you the answer quickly with enough context to interpret it.
Does FitCalc have any calculators Omni doesn't?
FitCalc's running pace calculator — which includes finish time estimates from pace, or pace from target finish time — covers some angles not directly available on Omni. But Omni's overall health calculator catalog is larger.