Health & Fitness — All 41 Free Online Tools
Every health & fitness tool on Toolfyra in one place — 41 free tools that run entirely in your browser. No signup, no uploads, no watermarks: open a tool, use it, close it — your data never leaves your device.
TDEE & Calorie Calculator
Free TDEE calculator: find your daily calorie needs with the Mifflin-St Jeor formula, plus cut and bulk target
🤰Pregnancy Due Date Calculator
Free pregnancy due date calculator: estimated due date from your last period, current week, trimester dates. B
🌸Ovulation Calculator
Free ovulation calculator: predict your fertile window and next period from cycle length and last period date.
📊Body Fat Calculator
Free body fat calculator using the US Navy tape method: measure neck, waist (and hips for women) to estimate b
🥗Macro Calculator
Free macro calculator: enter your daily calories and goal (cut, maintain, bulk) to get exact protein, carb and
⚖️Ideal Weight Calculator
Free ideal weight calculator: Devine, Robinson and Miller formulas plus the healthy BMI range — get a realisti
💧Water Intake Calculator
Free water intake calculator: your daily hydration target based on weight, activity and climate — in glasses,
🏋️One Rep Max Calculator
Free 1RM calculator: estimate your one-rep max from any weight × reps set using Epley and Brzycki formulas, pl
🩺Blood Pressure Checker
Free blood pressure checker: enter systolic & diastolic readings to see your AHA category — normal, elevated,
😴Sleep Cycle Calculator
Free sleep calculator: ideal bedtimes for your alarm in 90-minute cycles (3-6 cycles, 15-min fall-asleep buffe
🏃Running Pace Calculator
Free running pace calculator: distance and finish time gives pace per km/mile, speed, and 10K/half predictions
❤️Heart Rate Zone Calculator
Free heart-rate zone calculator: Tanaka max HR, resting-HR Karvonen option, all 5 training zones in BPM.
🔥Calories Burned Calculator
Free calories-burned calculator: weight x activity MET x time — walking, running, cycling, gym, sports, chores
📏Child Height Predictor
Estimate your child's adult height free using the standard mid-parental height method plus the doubling rule,
⏱️Screen Time Planner for Kids
Plan healthy screen time free: age-based guideline ranges, a weekly schedule you can build and print, and a fa
🔥Habit Streak Tracker
Track daily habits free: build streaks, see a 12-week heat map and your longest run. Data is stored only in yo
👟Steps to Calories Calculator
Convert your daily steps into calories burned using your weight, height (stride) and walking pace. Honest MET-
🍷Standard Drink / Units Calculator
Enter any drink's volume and ABV to see UK alcohol units, US and Australian standard drinks — the plain math b
🗓️Life in Weeks Visualizer
Visualize a 90-year life as 4,680 weekly boxes with the weeks you've lived filled in — the famous perspective
Protein Intake Calculator
Evidence ranges: 1.2 g/kg for general health, 1.6–2.2 for training, up to 2.4 in a cut. The per-meal split mat
⏳Intermittent Fasting Window Planner
16:8 and friends are just clock math from your last bite — the planner shows first-meal and kitchen-closes tim
👁️20-20-20 Eye Strain Break Timer
The 20-20-20 rule is the standard optometric advice for screen strain; this just counts how many breaks your s
🏃VO₂ Max Estimator (from pace & heart rate)
The 1-mile time trial formula (483/time + 3.5) is a published field estimate. Lab testing is the gold standard
❤️Recovery Heart Rate Calculator
A 1-minute heart-rate recovery of 12+ bpm is the commonly cited healthy threshold in cardiology literature; pe
Menstrual Cycle Predictor (Local-Only)
Calendar method: ovulation ≈ cycle length − luteal phase; fertile window spans the 5 days before plus day afte
💊Medication Schedule Builder (Reminder Times Only)
Evenly spaces doses across 24 h from your first dose and prints a fridge-sheet. Purely a scheduling aid — dosi
🧴Skin Type Quiz + Routine Order
Four honest signals (shine, tightness, reactivity, T-zone) map to the five classic skin types, each with a thi
🩸A1C to Average Glucose Calculator
Convert A1C to estimated average glucose in mg/dL or mmol/L and back, with ADA context bands explained in plai
❤️Blood Pressure Category Calculator
Check any reading against the 2017 AHA blood pressure categories with plain-English meaning for each, and keep
👂Online Hearing Test (Pure Tones)
Play stepped pure tones from 125 Hz to 12 kHz, mark what you hear, and see a frequency-range summary chart on
👶Baby Weight Percentile (WHO)
Place your baby's weight on the official WHO growth curve for age and sex, months 0–24, and read the percentil
☕Caffeine Half-Life Calculator
See how much caffeine is still in your system right now, watch the half-life curve across 24 hours, and find a
🤰Pregnancy Weight Gain Calculator
Get your IOM 2009 pregnancy weight-gain range from pre-pregnancy BMI, plus a week-by-week cumulative target an
🌙Private Period Tracker
Log period start dates and flow, get next-cycle predictions and a fertile-window estimate, and keep everything
🧬Blood Type Compatibility Chart
Pick any ABO and Rh type to see compatible red-cell donors, explore parent-to-child type possibilities, and re
🚭Smoking Cost Calculator
Turn your daily cigarettes into daily, yearly, and ten-year costs, add the 5 percent investing alternative, an
👟Steps to KM Converter
Convert steps to kilometers and miles using your height-based step length, estimate walking calories, and run
👁️Ishihara-Style Color Blindness Test
Read six self-drawn Ishihara-style number plates for a quick red-green screening indication at home — honest r
🫘GFR Calculator (CKD-EPI 2021)
Estimate eGFR with the CKD-EPI 2021 race-free creatinine equation, see your CKD stage G1–G5 highlighted, and s
⚖️Ideal Body Weight Calculator
Compute ideal body weight with the Devine formula plus your healthy BMI weight band and optional adjusted dosi
📐BSA Calculator
Calculate body surface area in m² with Du Bois and Mosteller, plus Haycock and Gehan-George, in cm/kg or ft-in