Most fitness coaches spend hours every week on work that a good tool could handle in minutes. Calculating a new client's maintenance calories, estimating their body fat, or building an intake form from scratch. These tasks pile up fast.
The good news? Most of what you need is free. In this guide, we cover the six best free tools for fitness coaches: what each one does, when to use it, and where to find it.
1. BMR and TDEE calculator
What it is: A BMR (basal metabolic rate) and TDEE (total daily energy expenditure) calculator estimates how many calories a person burns at rest and across a full day of activity.
Why it matters: When a new client asks "how many calories should I eat?", your answer needs to start with their TDEE. Skipping this step means guessing, and guesses erode trust fast.
What to look for in a calculator:
- Support for the Mifflin-St Jeor formula (reliable for most clients)
- Support for the Katch-McArdle formula (more accurate when body fat percentage is known)
- Activity level multipliers so the output reflects real daily movement, not just resting rate
We built a free BMR and TDEE calculator designed specifically for coaching consultations. It runs both formulas, applies five activity levels, and gives you a calorie range in under a minute (no sign-up required).
When to use it: During onboarding calls. Pull it up alongside your client, enter their numbers together, and walk them through the result. It makes the calorie conversation concrete and shows your expertise from day one.
2. One-rep max (1RM) calculator
What it is: A 1RM calculator estimates a client's maximum single-rep lift based on a submaximal set they've already done.
Why it matters: Testing a true 1RM with every client is risky and time-consuming. Instead, have them do a challenging set of 3 to 10 reps, then use the calculator to estimate their max. From there, you can write percentages into their program (for example, "4 sets of 6 at 75% of 1RM").
The Epley formula (the most widely used):
Estimated 1RM = weight × (1 + reps / 30)
If a client presses 60 kg for 8 reps: 60 × (1 + 8/30) = 76 kg estimated 1RM.
Where to find it: Strength Level has a solid free 1RM calculator. It also shows strength standards by bodyweight class, which clients find motivating and coaches can use to benchmark progress.
3. Macro calculator
What it is: A macro calculator splits a client's daily calorie target into grams of protein, fat, and carbohydrates based on their goal.
Why it matters: Most clients have no idea how to hit a calorie target without also knowing their macros. Giving them a number like 2,200 kcal with no breakdown leaves them guessing at the grocery store.
A practical starting framework:
| Goal | Protein | Fat | Carbs |
|---|---|---|---|
| Fat loss | 2.0–2.4 g/kg | 0.7–1.0 g/kg | Fill remaining calories |
| Maintenance | 1.6–2.0 g/kg | 0.8–1.2 g/kg | Fill remaining calories |
| Muscle gain | 1.6–2.2 g/kg | 1.0–1.5 g/kg | Fill remaining calories |
For example, a 75 kg client eating 2,400 kcal for muscle gain:
- Protein: 150 g (600 kcal)
- Fat: 75 g (675 kcal)
- Carbs: 281 g (1,125 kcal)
Where to find it: IIFYM.com offers a free macro calculator that is straightforward and doesn't require an account. Cronometer (free tier) goes further and lets clients log meals against their targets.
4. Body fat percentage estimator
What it is: A body fat estimator calculates body fat percentage from simple tape measurements. No calipers, no DEXA scan required.
Why it matters: Body composition matters more than bodyweight alone for most fitness clients, but most people don't have access to a DEXA machine or a trained technician with calipers. The US Navy method gives you a reasonable estimate (within 3–5%) using just a measuring tape and a calculator.
Measurements you need:
- Men: height, neck circumference, waist circumference (measured at the navel)
- Women: height, neck, waist, and hip circumference
Practical tip: Take measurements under the same conditions every time: first thing in the morning, before eating or drinking. Consistency matters more than absolute accuracy when tracking trends over weeks.
Where to find it: The ACE Fitness tools page includes a body fat and BMI calculator, both free. ExRx.net also has a body composition section with reference charts for context.
5. Client intake form template
What it is: A structured questionnaire you send to new clients before their first session or onboarding call.
Why it matters: Going into an onboarding call without knowing a client's injury history, training background, or goals wastes everyone's time. A good intake form collects everything you need upfront, so the call can focus on goals and relationship rather than basic data entry.
What to include:
- Basic stats (age, height, current bodyweight, goal bodyweight)
- Training history and current experience level
- Injury history and any movement restrictions
- Specific goals and desired timeline
- Diet preferences and any restrictions or allergies
- Available training days per week and access to equipment
- What they've tried before and why it didn't stick
How to build it for free: Google Forms is free, shareable via a link, and stores responses in a connected Google Sheet automatically. Use conditional logic (show a question only if the previous answer triggers it) to keep the form concise for beginners while covering every detail for advanced clients.
6. Progress tracking spreadsheet
What it is: A simple spreadsheet that logs a client's bodyweight, measurements, and key lift numbers over time.
Why it matters: Progress is non-linear. Clients forget their starting point and assume they're failing when they're actually just in a normal plateau. A spreadsheet gives you objective data to show them, turning "I feel like nothing is working" into "you're down 4.5 kg since week one."
What to track weekly or bi-weekly:
- Morning bodyweight (fasted, consistent time)
- Key measurements: waist, hips, chest, arms
- One or two key metrics per goal (squat or deadlift for strength, resting heart rate or run time for cardio)
- Optional: energy level and sleep quality (1–10 scale)
How to build it for free: Start with a blank Google Sheet. Set up one tab per client with columns for date, weight, measurements, and lifts. Conditional formatting (color by trend) makes progress visible at a glance. The r/Fitness recommended routines wiki also has free program templates you can reference and adapt for clients.
How to use these tools without overcomplicating things
Free tools are only useful when they fit into a repeatable process. Here is a simple workflow that covers most coaching scenarios without adding a pile of tabs to manage:
- Before the onboarding call: Send the client intake form (Google Forms)
- During the onboarding call: Open the BMR and TDEE calculator together, walk through the numbers out loud
- After the call: Set macro targets manually (use the framework above or a macro calculator), share the progress tracking spreadsheet
- Every 4–6 weeks: Recalculate TDEE as bodyweight changes, update the spreadsheet, review trends with the client
Four tools. One workflow. Most of the admin is handled before you write a single workout.
Frequently asked questions
Are free fitness coaching tools accurate enough for professional use?
For most clients, yes. The Mifflin-St Jeor formula (used by most BMR calculators) has a margin of error of around 10% for the general population. That is close enough to set a starting calorie target. You will adjust based on real-world results after two weeks anyway. Where accuracy matters most is consistency: use the same tool and the same method each time, and the trend data becomes reliable.
How often should I recalculate a client's TDEE?
Every 4–6 weeks, or whenever their bodyweight changes by more than 3–4 kg. TDEE decreases as clients lose body mass. Failing to adjust calories is one of the most common reasons fat-loss progress stalls after an initial drop. The BMR and TDEE calculator takes under a minute to re-run with updated numbers.
Do I need paid tools when I have more clients?
Free tools work well with a small roster. Once you are managing 10 or more clients, the time cost of juggling individual spreadsheets, forms, and separate calculators adds up. A centralized coaching platform handles client management, program delivery, and progress tracking from one place, saving more time than it costs. fitcomrade is built specifically for solo coaches who want to scale without drowning in admin.
What is the difference between BMR and TDEE?
BMR is the number of calories your body burns at complete rest to keep you alive (breathing, circulation, cell repair). TDEE adds the calories burned through daily movement, exercise, and digestion. For coaching purposes, TDEE is the number that matters. It is the baseline you adjust up or down to create a surplus (muscle gain) or deficit (fat loss).
Which body fat measurement method is most reliable for client tracking?
For coaches working remotely, the Navy tape method is the most practical. It is within 3–5% of DEXA for most body types, requires no special equipment, and clients can take their own measurements at home. For in-person coaches, 7-site caliper testing is more precise but requires a trained hand. Regardless of method, consistency and the same testing conditions matter more than absolute accuracy.
The bottom line
You do not need expensive software to coach clients well. A BMR/TDEE calculator, a macro reference, a simple intake form, and a Google Sheet cover most of what you need for your first 10–15 clients.
Start with our free BMR and TDEE calculator. It takes under a minute and gives you numbers you can use on your next call today.
When your client list grows and admin starts eating into your coaching time, fitcomrade brings everything into one clean dashboard, built for solo coaches.