Fever Tracker by My Medicine Advisor helps you monitor temperatures precisely, classify severity instantly, and keep a private Temperature Log that exports to CSV or prints as a doctor-ready report. Whether you’re a parent monitoring a child with a sudden high temperature, an adult trending recovery after flu, or a caregiver organizing multiple readings per day, this Fever Tracker simplifies everything into a clear, trustworthy workflow — fast, accurate, and privacy-safe.

Fever Tracker & Temperature Log

Track temperatures in °C/°F, classify fever instantly, and keep a secure local log. Export CSV or print a doctor-ready PDF. No sign-inWorks offline

Temperature

Enter measured value only—unit & site below.

Unit

Measurement site

We convert to an oral-equivalent for consistent classification.

Age group

Date & time

Fever days (optional)

If fever has lasted ≥5 days, guidance tightens for kids.

Notes (optional)

Result

Awaiting input

Enter a temperature and click Analyze.

Date & Time	Reading	Site	Age	Severity	Notes	Actions
No entries yet.

Data stays on your device (LocalStorage).

Important: This educational tool does not replace professional medical advice. If you’re worried, seek care immediately—especially for infants, serious symptoms, very high temperatures, or dehydration.

Quick actions: Add your reading → choose °C/°F and measurement site → select age group → press Analyze → save to your Temperature Log → export CSV or print PDF for your clinician.

Why use our Fever Tracker?

Clarity: Our Fever Tracker normalizes ear/rectal/armpit/forehead readings to an oral-equivalent so you’re comparing apples to apples. That’s crucial because various sites can read slightly higher or lower than oral. Most clinical sources note that rectal and tympanic are often ~0.3–0.6 °C (0.5–1 °F) higher than oral, while axillary and many forehead scanners can read ~0.3–0.6 °C lower. We apply these small, conservative adjustments to your Temperature Log so your trendline is consistent and your severity labels are dependable. Mount Sinai Health System MyHealth Alberta
Evidence-based cutoffs: The Fever Tracker highlights standard thresholds: fever is commonly defined as ≥ 38.0 °C (100.4 °F); it flags higher tiers to prompt attention, and it uses age-aware advice for infants and children following reputable guidance (see details below). Hopkins Medicine
Speed & privacy: It runs entirely in the browser (no heavy libraries), saving entries locally. Your Temperature Log stays on-device — then export or print when you’re ready.
Complements other vitals & tools: Fever rarely stands alone. Pair your Fever Tracker with our Symptom Checker, Prescription Checker, Medicine Dosage Calculator, and Blood Pressure Tracker to build a complete, sharable health picture.

What counts as a fever — and why 38.0 °C matters

Most healthcare sources agree that 38.0 °C (100.4 °F) oral or above meets the definition of fever. Normal oral temperatures typically hover around 36.4–37.2 °C (97.5–98.9 °F), with natural daily variation (lower in the morning, higher late afternoon/evening). Our Fever Tracker uses these ranges to label Normal, Low-grade fever, Fever, and High fever/Hyperpyrexia tiers so you can make sense of the number in context. Hopkins Medicine

Tip: When you toggle °C/°F in the Fever Tracker, the tool converts accurately and updates your Temperature Log and charts consistently — including the Celsius to Fahrenheit reference many users search for.

Age-aware guidance built into the Fever Tracker

Infants and children need special rules. The Fever Tracker doesn’t diagnose; it highlights thresholds and red flags so you know when to escalate:

Infants < 3 months with a temperature ≥ 38.0 °C (100.4 °F) should be urgently evaluated by a clinician. This is a widely recommended cutoff in pediatrics because newborns may have serious infections without many other signs. HealthyChildren.org
Ages 3–6 months with ≥ 39.0 °C (102.2 °F) ⇒ contact a clinician promptly and watch for other symptoms. NHS inform
Children with fever ≥ 5 days ⇒ seek medical advice even if the child seems otherwise okay; persistent fever can signal issues that deserve a professional review. NHS inform

The Fever Tracker also prompts you to note symptoms like breathing difficulty, stiff neck, seizures, dehydration, persistent vomiting, or concerning rashes — any of which should raise the urgency regardless of the exact number. These red flags align with reputable pediatric guidance. HealthyChildren.org

Measurement site matters — why our Fever Tracker normalizes readings

A common source of confusion: “Why is the ear reading higher than the mouth?” or “Why is the armpit reading lower?” Clinical references consistently note small, directional differences:

Rectal & Ear (Tympanic): often ~0.3–0.6 °C (0.5–1 °F) higher than oral.
Armpit (Axillary) & many Forehead (Temporal) scanners: often ~0.3–0.6 °C lower than oral. Mount Sinai Health System MyHealth Alberta

Our Fever Tracker converts everything to an oral-equivalent using conservative offsets so your Temperature Log trends are meaningful. That way your “Fever chart” over time reflects true change rather than the quirks of different devices or sites.

How to use the Fever Tracker for actionable insights

Measure correctly. Use a reliable thermometer. If oral, avoid hot/cold drinks for 15–30 minutes prior; if axillary/temporal, ensure proper placement; for infants, rectal (with proper technique) may be considered more reliable — follow your clinician’s advice. Mount Sinai Health System
Log consistently. Enter date & time, value, unit, site, age, and any symptoms. The Fever Tracker stores this in your private Temperature Log.
Analyze with one click. The tool classifies severity using evidence-based thresholds and flags pediatric red-flags when relevant. High temperature in children and fever symptoms (like lethargy, poor hydration, breathing issues) deserve extra caution. Hopkins Medicine HealthyChildren.org
Trend, then share. Export CSV for a spreadsheet “fever diary,” or Print/Save PDF to share a crisp summary with your clinician.

Interpreting results in context (not just the number)

Fever monitoring should consider behavior, hydration, breathing, and duration — not just the peak value. In many children, a higher number is less concerning if they’re drinking fluids, responsive, breathing comfortably, and improving with appropriate care; conversely, a lower temperature with alarming symptoms warrants attention. Always follow local emergency guidance and your clinician’s instructions. HealthyChildren.org

Extreme high temperatures: ≥ 41.1 °C (106 °F) is often termed hyperpyrexia and requires urgent medical care. If you ever see this level — verify with a second reading and seek emergency help. Medical News Today

Who benefits most from a Temperature Log?

Parents: Capture every 4–6-hour reading during an illness, plus notes on medication time/dose (as directed by your clinician) and hydration. A structured Temperature Log often shortens triage conversations.
Adults monitoring recovery: Track daily highs/lows; note associated fever symptoms (chills, fatigue, headache).
Caregivers for seniors or chronic conditions: Pair temperature trends with blood pressure, pulse, and oxygen saturation when advised — our Blood Pressure Tracker and Symptom Checker are perfect companions.
Pregnancy context: Temperature + symptoms should be discussed with your clinician; keep your Pregnancy Due Date Calculator handy for timelines.

Pro tips for better fever monitoring

Same device, same site: Consistency makes your Fever chart more reliable.
Record before meds (when possible): If a clinician recommends fever reducers, record a reading before dosing and again after to see response.
Hydration & environment: Keep the room comfortably cool, dress lightly (not cold), and encourage fluids as directed.
Avoid “shock cooling”: Don’t apply very cold water/ice directly — gentle cooling is safer; prioritize comfort and hydration. Follow clinician or trusted national guidance rather than viral tips. nhs.uk

Pair your Fever Tracker with these tools

Symptom Checker — interpret fever symptoms in context.
Prescription Checker — double-check what’s on the label (educational).
Medicine Dosage Calculator — helps you discuss common dosing questions with your clinician.
Blood Pressure Tracker — log other vitals alongside your Temperature Log.
Asthma Control Test (ACT) — fever with wheeze/cough? Track control.
Diabetes Risk Assessment Tool & Kidney Health Checker — comorbidities can influence decisions.
Vitamin Deficiency Calculator & Skin Type Analyzer — wellness context for long-term care.
Pill Identifier — verify pill appearance when reconciling medications (educational).

Trusted sources we align with

Johns Hopkins Medicine: Fever overview, typical ranges, and definition ≥ 38.0 °C. Hopkins Medicine
HealthyChildren (AAP): When to call the pediatrician, especially < 3 months ≥ 38 °C and warning signs. HealthyChildren.org
NHS / NHS Inform: Practical guidance on high temperature in children, ≥ 39 °C thresholds, and when to seek help or continue monitoring. nhs.uk NHS inform
Mount Sinai / MyHealth Alberta: Measurement site differences (oral vs rectal/ear vs axillary/temporal). Mount Sinai Health System MyHealth Alberta

(We cite the key facts while keeping your copy skimmable and globally useful.)

FAQ — Fever Tracker & Temperature Log

What temperature is considered a fever?

Most providers define fever as ≥ 38.0 °C (100.4 °F) using an oral reading. Our Fever Tracker uses this cutoff and highlights higher tiers for clarity. Hopkins Medicine

Why does the Fever Tracker adjust readings by site?

Because different sites read differently. Rectal and ear (tympanic) often run higher than oral, while armpit and many forehead scanners can run lower; the Fever Tracker converts to oral-equivalent so your Temperature Log is consistent. Mount Sinai Health System MyHealth Alberta

When should a baby or child see a doctor?

• < 3 months and ≥ 38.0 °C: urgent evaluation.
• 3–6 months and ≥ 39.0 °C: contact a clinician.
• Any age with concerning symptoms (breathing difficulty, seizures, stiff neck, dehydration, persistent vomiting, non-blanching rash, looks very unwell): seek care promptly. HealthyChildren.org NHS inform

Does a higher number always mean worse illness?

Not necessarily. Behavior, hydration, breathing, and duration matter. Use the Fever Tracker to trend, but escalate based on the whole picture and your clinician’s advice. HealthyChildren.org

Can I share my Temperature Log with a doctor?

Yes. Click Export CSV for a spreadsheet or Print / Save PDF for a clean, clinic-friendly summary.

Is my data private?

Yes — the Fever Tracker saves entries locally in your browser. Nothing is uploaded to our servers unless you choose to share an exported file.

Should I use Celsius or Fahrenheit?

Use whichever is standard in your region; our Fever Tracker supports Celsius to Fahrenheit conversion instantly and logs both for clarity.

What about very high fever (hyperpyrexia)?

≥ 41.1 °C (106 °F) is often called hyperpyrexia; verify with a repeat reading and seek urgent/emergency care. Medical News Today

Compliance & common-sense reminders

The Fever Tracker is an educational tool to assist fever monitoring and Temperature Log organization. It does not replace professional medical advice, diagnosis, or treatment. If you’re worried — especially with a baby < 3 months, very high temperatures, worsening symptoms, difficulty breathing, seizures, confusion, or signs of dehydration — seek medical care immediately. HealthyChildren.org Hopkins Medicine