Healthy Calculator Hub
33 free health and fitness calculators - BMI, body fat, TDEE, macros, sleep and heart-rate zones. Every one shows the formula it used and cites its primary source. No sign-up, no paywall.
Published listing
Listed on IndieTools
Healthy Calculator Hub vs Catalyst Healthspan Tools
Healthy Calculator Hub and Catalyst Healthspan Tools are publicly listed products on IndieTools. This comparison brings their recorded features, pricing and product information together, alongside stored mobile and desktop website measurements where available so you can check the details that matter to your workflow.
Side-by-side facts · Product order does not indicate a winner
Last updated:
Catalyst Healthspan Tools
Ten free, evidence-based calculators that measure how well your body is ageing, not how it looks. Percentile scoring by age and sex, cited research, no sign-up.
Published listing
Listed on IndieTools
At a glance
Available listing details and recorded measurements. An unavailable value is not a negative result.
| Detail | Healthy Calculator Hub | Catalyst Healthspan Tools |
|---|---|---|
| Categories | ||
| Ahrefs Domain Rating |
|
|
| Mobile performance |
|
|
| Public founders | ||
| Published on IndieTools |
|
|
Key differences
- The stored Ahrefs Domain Rating is 7 for healthycalculatorhub.com (Oct 8, 2026) and 55 for catalystperformance.sg (Oct 8, 2026). Domain Rating describes backlink strength, not product quality.
- The recorded mobile performance scores are 99/100 for Healthy Calculator Hub (Oct 9, 2026) and 71/100 for Catalyst Healthspan Tools (Oct 8, 2026), using psi-mobile-two-sample-mean-v1 with 2 samples each. These are separate laboratory observations.
- Recorded feature highlights differ: Healthy Calculator Hub lists Body composition calculators, Exercise and nutrition calculators; Catalyst Healthspan Tools lists Fitness estimates, Body-composition calculators. These are listing highlights, not exhaustive capability inventories; an omitted feature may still be available.
- The listed use cases differ: Healthy Calculator Hub lists Estimating exercise pace or calorie inputs, Comparing metric and imperial fitness inputs; Catalyst Healthspan Tools lists Explore estimated fitness and body-composition indicators. Test the specific workflow you need before choosing.
What they have in common
- Both are listed in Fitness on IndieTools.
Domain Rating
Domain Rating is an Ahrefs backlink-strength metric, not a Google ranking score or a measure of product quality. Public readings must match the current product domain and be no more than 21 days old. History covers recorded readings for that domain; missing history does not mean the rating never changed.
Healthy Calculator Hub
7/ 100
healthycalculatorhub.com
Measured
- Previous measurement
- 9 ·
- Change from previous
- -2 points
- Highest recorded
- 9
- Recorded measurements
- 25
Catalyst Healthspan Tools
55/ 100
catalystperformance.sg
Measured
- Previous measurement
- 53 ·
- Change from previous
- +2 points
- Highest recorded
- 55
- Recorded measurements
- 25
Website performance
Speed values are stored laboratory measurements, not real-user Core Web Vitals. Mobile and desktop runs may have different dates, sample counts and methodologies; compare the same device and method. Missing results are unavailable, not zero, and no overall winner is inferred.
Mobile measurements
Healthy Calculator Hub
99Performance / 100
Measured
2 samples
Method: psi-mobile-two-sample-mean-v1
Catalyst Healthspan Tools
71Performance / 100
Measured
2 samples
Method: psi-mobile-two-sample-mean-v1
| Detail | Healthy Calculator Hub | Catalyst Healthspan Tools |
|---|---|---|
| First Contentful Paint |
|
|
| Largest Contentful Paint |
|
|
| Cumulative Layout Shift |
|
|
| Total Blocking Time |
|
|
| Speed Index |
|
|
| Time to First Byte |
|
|
| Load time |
|
|
What is Healthy Calculator Hub?
Healthy Calculator Hub is a free set of 33 health and fitness calculators, built so you can see exactly where each number comes from. Most calculator sites hand you a figure and expect you to trust it. Every page here shows the formula it used and links the primary source behind it - over 200 citations to CDC, WHO, NIH, NHS, ACOG and the original research papers. What's inside: → Body composition - BMI, body fat, FFMI, lean body mass, waist-to-hip, waist-to-height, ideal weight, body surface area, Army body fat, reverse BMI → Calories and energy - TDEE, BMR, calories burned, calorie deficit, weight-loss timeline, weight-loss percentage → Nutrition - macros, protein, carbs, water intake,…
Selected listed features
Body composition calculators
Includes BMI, waist-ratio and body-composition estimation tools.
Exercise and nutrition calculators
Provides pace, calorie, macro and hydration calculation tools.
What is Catalyst Healthspan Tools?
Catalyst Healthspan Tools is a set of ten free, evidence-based calculators that measure how well your body is ageing. Not how it looks. Each calculator maps to one of the four pillars used in a real assessment protocol at Catalyst Performance, a longevity training studio in Singapore's CBD: body composition, cardiorespiratory fitness, stability, and strength. Enter a few numbers, get an instant result, and see your percentile by age and sex alongside what that number actually predicts. No sign-up. No email wall. No app. Every threshold is drawn from published reference standards and cited on the page. The ten tools: Fitness Age, VO2 Max, Grip Strength, Waist-to-Height Ratio, Sitting-Rising…
Selected listed features
Fitness estimates
Body-composition calculators
Use cases and audience
Use cases and audiences below reflect the information provided in each product listing.
Healthy Calculator Hub
- Estimating exercise pace or calorie inputs
- Comparing metric and imperial fitness inputs
Catalyst Healthspan Tools
- Explore estimated fitness and body-composition indicators
Meet the founders
Explore the publicly listed founder profiles connected to each product.
Healthy Calculator Hub
Catalyst Healthspan Tools
Choosing for your workflow
- Consider Healthy Calculator Hub when evaluating Estimating exercise pace or calorie inputs, Comparing metric and imperial fitness inputs. These are the use cases listed by the product; test your own workflow before choosing.
- Consider Catalyst Healthspan Tools when evaluating Explore estimated fitness and body-composition indicators. These are the use cases listed by the product; test your own workflow before choosing.
- Use website measurements to review a measured page and device, then test your own application workflow. A landing-page score does not establish application performance or an overall winner.
Frequently asked questions
- What is the difference between Healthy Calculator Hub and Catalyst Healthspan Tools?
- The stored Ahrefs Domain Rating is 7 for healthycalculatorhub.com (Oct 8, 2026) and 55 for catalystperformance.sg (Oct 8, 2026). Domain Rating describes backlink strength, not product quality. The recorded mobile performance scores are 99/100 for Healthy Calculator Hub (Oct 9, 2026) and 71/100 for Catalyst Healthspan Tools (Oct 8, 2026), using psi-mobile-two-sample-mean-v1 with 2 samples each. These are separate laboratory observations.
- Which should I choose: Healthy Calculator Hub or Catalyst Healthspan Tools?
- Consider Healthy Calculator Hub when evaluating Estimating exercise pace or calorie inputs, Comparing metric and imperial fitness inputs. These are the use cases listed by the product; test your own workflow before choosing. Consider Catalyst Healthspan Tools when evaluating Explore estimated fitness and body-composition indicators. These are the use cases listed by the product; test your own workflow before choosing.
- Are these mobile and desktop Speed scores directly comparable?
- Speed values are stored laboratory measurements, not real-user Core Web Vitals. Mobile and desktop runs may have different dates, sample counts and methodologies; compare the same device and method. Missing results are unavailable, not zero, and no overall winner is inferred.
- What does Domain Rating tell me about these products?
- Domain Rating is an Ahrefs backlink-strength metric, not a Google ranking score or a measure of product quality. Public readings must match the current product domain and be no more than 21 days old. History covers recorded readings for that domain; missing history does not mean the rating never changed.
- Who are the founders listed for Healthy Calculator Hub and Catalyst Healthspan Tools?
- Healthy Calculator Hub: Javeed Shaik. Catalyst Healthspan Tools: Bervin Manoharan. Only public, accepted founder relationships are included.
- Are Healthy Calculator Hub and Catalyst Healthspan Tools alternatives?
- Their public listings overlap in the categories Fitness, making them candidates to evaluate together. This overlap does not establish feature parity or interchangeability; check integrations, limits and your required workflow.
- Where do the comparison details come from?
- Product descriptions, pricing, platforms, countries and technologies come from public IndieTools listings and founder-provided details. Domain Rating comes from stored Ahrefs readings; Speed comes from stored measurement records. Last updated reflects the latest recorded listing, feature, measurement or public activity change shown here, not a fresh website audit.
Related product comparisons
Explore other recorded comparisons involving Healthy Calculator Hub or Catalyst Healthspan Tools.
Catalyst Healthspan Tools vs Sitting-Rising Test Scorer
Catalyst Healthspan Tools: Ten free, evidence-based calculators that measure how well your body is ageing, not how it looks. Percentile scoring by age and sex, cited research, no sign-up. · Sitting-Rising Test Scorer: Score the sitting-rising test out of 10, a no-equipment floor sit-to-stand check of strength, balance and mobility that research has linked to all-cause mortality.
Compare products
Healthy Calculator Hub vs Ltrl
Healthy Calculator Hub: 33 free health and fitness calculators - BMI, body fat, TDEE, macros, sleep and heart-rate zones. Every one shows the formula it used and cites its primary source. No sign-up, no paywall. · Ltrl: AI health answers from the experts you follow, with every source cited.
Compare products
Catalyst Healthspan Tools vs Trynkit
Catalyst Healthspan Tools: Ten free, evidence-based calculators that measure how well your body is ageing, not how it looks. Percentile scoring by age and sex, cited research, no sign-up. · Trynkit: A playground of ten-plus tiny novelty tools — meme generators, quirky calculators and one-off toys — each built around a single question you can answer in seconds and send to a group chat. Free, no si
Compare products