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Calculators and GLP-1 tools

Weight-loss math, clearly shown

Calculators for calories, protein and steps, plus GLP-1 tools for doses, side effects and cost. Every result shows the formula and the source behind it.

Run my numbers I'm on a GLP-1
  • Formulas shown, never hidden
  • Sourced to FDA labels and trials
  • No sign-up or email gate
  • Not affiliated with any drug maker
−500 kcal/day 1.2–1.6 g/kg protein

Try it: change any number and the math updates live.

22calculators, no sign-up
9GLP-1 medicines covered
16side effects tracked by label rate
24plain-English guides

Start with your numbers

Six tools most people need first

Weight loss is mostly arithmetic you never get to see. These show it: what you burn, what to eat and how long it really takes.

All 22 calculators

TDEE calculator

Calories you burn a day, plus targets to lose, keep or gain

Calculate

Calorie deficit calculator

Your daily target and a realistic goal date

Calculate

Protein floor calculator

How much protein keeps muscle while you lose fat

Calculate

Macro calculator

Protein, carbs and fat in grams for any calorie budget

Calculate

BMI and GLP-1 eligibility

Your BMI and where it sits against label thresholds

Calculate

Steps to miles

Distance, time and calories from your step count

Calculate

Explainers in 20 seconds

Watch the math happen

Short animated explainers, no sound needed. Each one has a transcript, and every number in it matches the calculators.

STEP 1 · RESTING BURN BMR (Mifflin-St Jeor) 1,528 kcal/day woman · 35 · 5 ft 6 in · 180 lb STEP 2 · ADD MOVEMENT BMR + everyday activity × 1.375 2,101 kcal/day = TDEE STEP 3 · SET A DEFICIT TDEE minus 500 −500 1,601 kcal/day target STEP 4 · WHAT TO EXPECT 180 lb ~1 lb a week at first slows over time week 0week 30 0:21 · voiced · captions on
Your body burns energy even at rest. That's your BMR: about 1,528 kcal a day for a 35-year-old woman who is 5 ft 6 in and 180 lb.
0:00 / 0:21
How your daily calories are worked out
Read the transcript
  1. Your body burns energy even at rest. That's your BMR: about 1,528 kcal a day for a 35-year-old woman who is 5 ft 6 in and 180 lb.
  2. Daily movement multiplies it. Light activity is × 1.375, so 1,528 becomes about 2,101 kcal. That's your TDEE.
  3. Eat about 500 kcal less than your TDEE and you're in a deficit: around 1,601 kcal a day.
  4. That's roughly 1 lb a week at first. Loss slows as your body adapts, so treat the number as a starting point and adjust.
  • Numbers match the formulas and FDA labels used across the site.

Already on a GLP-1

Tools for the parts nobody explains

Your prescriber sets the dose. These help with everything between appointments: the calendar, your stomach, the scale and the bill.

Your dose

Know which step you're on, when the next one is due and what the label says about each.

Your progress

See what the trials suggest for someone your weight, then track yourself against it.

Your costs

List price, self-pay and savings cards side by side, with the date we last checked.

Project my weight loss

Small wins count

You don't need a huge number to feel better

Losing just 5% to 10% of your weight can improve blood pressure, blood sugar and cholesterol, according to the CDC. For a 200 lb person, 5% is 10 lb.

5%first health milestone 8ksteps a day, a steady habit 30gprotein at each meal 7h+sleep, the underrated win

Track my wins Wins beyond the scale

A woman walking along a country path in morning light
Photo: Emma Simpson / Unsplash

Why Sunny Weigh

AI can summarize. It can't do your math

Search now opens with an AI summary of doses and side effects. Handy, but it can't work out your protein floor at 182 lb or a titration calendar from your start date. That's the gap we fill, and we show every step so you can check it.

  • Every formula named and shown with your own numbers substituted
  • Every drug fact linked to its FDA label on DailyMed or the trial paper
  • Every page dated and re-checked on a schedule: prices monthly, labels quarterly
Example · woman, 34, 5 ft 6 in, 182 lb, lightly active
Step 1 · Resting burn (Mifflin-St Jeor)
BMR = 10 × 82.6 kg + 6.25 × 167.6 cm − 5 × 34 − 161 = 1,542 kcal
Step 2 · Daily burn
TDEE = 1,542 × 1.375 activity = 2,121 kcal
Step 3 · Lose about 1 lb a week
Target = 2,121 − 500 = 1,621 kcal
Step 4 · Protein floor
Protein = 82.6 kg × 1.2 to 1.6 g = 99–132 g
Run it with your numbers

Trial results, side by side

How much weight people lost in the trials

Average weight loss on each medicine in its main weight-management trial, with diet and activity advice for everyone, including the placebo groups.

These come from different trials with different people and lengths, so they aren't a head-to-head result. For a direct comparison, see Zepbound vs Wegovy.

Project my own loss
Zepbound 15 mgSURMOUNT-1 · 72 wk
20.9%
Zepbound 10 mgSURMOUNT-1 · 72 wk
19.5%
Zepbound 5 mgSURMOUNT-1 · 72 wk
15.0%
Wegovy 2.4 mgSTEP 1 · 68 wk
14.9%
Wegovy pill 25 mgOASIS 4 · 64 wk
13.6%
Saxenda 3 mgSCALE · 56 wk
8.0%
Placeborange 2.2% to 3.1%
3.1%
Average % of starting body weight lost. Sources: SURMOUNT-1 (NEJM 2022), STEP 1 (NEJM 2021), OASIS 4 and SCALE trials, as reported in each drug's FDA label.

GLP-1 medicines

Every approved GLP-1, one format

Dosing, side effects, storage, missed doses, cost and coverage, pulled from each FDA label and laid out the same way.

Zepbound

Weight
tirzepatide · Eli Lilly · Once weekly shot

Weekly tirzepatide injection for weight management and obstructive sleep apnea

20.9% avg loss · SURMOUNT-1

Wegovy

Weight
semaglutide · Novo Nordisk · Once weekly shot

Weekly semaglutide injection for weight management and heart-risk reduction

14.9% avg loss · STEP 1

Ozempic

Type 2 diabetes
semaglutide · Novo Nordisk · Once weekly shot

Weekly semaglutide injection for type 2 diabetes, heart and kidney protection

Studied in SUSTAIN program

Mounjaro

Type 2 diabetes
tirzepatide · Eli Lilly · Once weekly shot

Weekly tirzepatide injection for blood sugar control in type 2 diabetes

Studied in SURPASS-2

Wegovy pill

Weight
oral semaglutide · Novo Nordisk · Once daily tablet

Daily semaglutide tablet for weight management, the first GLP-1 pill for obesity

13.6% avg loss · OASIS 4

Rybelsus

Type 2 diabetes
oral semaglutide · Novo Nordisk · Once daily tablet

Daily semaglutide tablet for type 2 diabetes

Studied in PIONEER program

Saxenda

Weight
liraglutide · Novo Nordisk · Once daily shot

Daily liraglutide injection for weight management, the older daily option

8.0% avg loss · SCALE Obesity and Prediabetes

Trulicity

Type 2 diabetes
dulaglutide · Eli Lilly · Once weekly shot

Weekly dulaglutide injection for type 2 diabetes in adults and children 10 and older

Studied in AWARD program

Victoza

Type 2 diabetes
liraglutide · Novo Nordisk · Once daily shot

Daily liraglutide injection for type 2 diabetes in adults and children 10 and older

Studied in LEAD program

Most-compared

Zepbound vs Wegovythe top two for weightMounjaro vs Zepboundsame drug, two labelsOzempic vs Wegovysame drug, two labelsOzempic vs Mounjarotype 2 diabetesTirzepatide vs semaglutidethe moleculesWegovy vs Wegovy pillshot or tablet

New and coming: orforglipron (Foundayo, a GLP-1 pill approved in April 2026 without the empty-stomach rule) and retatrutide (a triple-hormone shot still in trials).

Licensed in your state

Want a clinician to reach out?

We know licensed clinicians in every state. Tell us where you live and, if you'd like, we'll ask one to contact you about weight-loss care, including whether a GLP-1 fits.

  • Licensed where you live, so video visits are possible
  • They can talk through coverage, cost and options
  • No obligation: you decide what happens next
Sunny Weigh doesn't prescribe or provide care. A clinician decides whether any treatment is right for you.
A doctor in a white coat talks with a patient on a laptop video call
Photo: Vitaly Gariev / Unsplash

How we keep it honest

Four checks before a page goes live

On a medicine site, trust is the product. Here's the process every health page goes through, and the status it shows you.

Clinician review in progress Public corrections log
  1. Primary sources onlyFDA labels on DailyMed, peer-reviewed trials and manufacturer pricing pages. No blog-to-blog facts.
  2. Every number fact-checkedEach figure is matched to its source and linked inline.
  3. Clinician sign-offA licensed MD, DO or PharmD reviews drug pages; a registered dietitian reviews nutrition tools. Named and dated.
  4. Re-check calendarPrices monthly, label facts quarterly, trial projections every 6 months, and sooner when anything changes.

Web stories

Tap through in under a minute

445 short visual explainers on food, fat loss, GLP-1s and the math behind them.

All stories
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From the blog

Straight answers, with sources

All 114 posts
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Fat and fitnessHow to lose body fat (and keep your muscle)The scale can drop while you lose muscle, or barely move while you lose fat. Fat loss is a different goal tha…
MedicationsDoes metformin cause weight lossIn a landmark prevention study, people on metformin lost about 2 kg (around 4 to 5 lb) on average. Helpful, b…
Fat and fitnessHow to get thin the healthy way: lean and strongThe look most people mean by "skinny" is usually lean: less fat, enough muscle. Starving gets you smaller and…

Prefer deep dives? Read the 24 guides

Questions

Before you trust a calculator

Fair questions for any health tool. Here are straight answers.

All 300 questions answered Glossary A to Z

How accurate are these calculators?

They use the formulas clinicians and researchers use, such as Mifflin-St Jeor for calorie needs, and we show each one with your numbers in it. Any formula estimates an average; your real needs can differ by 10% or more, so track your results and adjust.

Is Sunny Weigh medical advice?

No. The tools do math and summarize FDA labels and published trials. Your prescriber decides whether a medicine fits you and at what dose.

Do you sell GLP-1 medicines or work with drug makers?

No. We don't sell medicine, we aren't affiliated with Eli Lilly or Novo Nordisk, and we never rank or promote compounded-drug sellers.

Where do the prices come from?

From manufacturer pricing pages and announcements. Each price shows when we last checked it, and prices are re-checked monthly because they change often.

Do you store my weight or health data?

No. Calculators run in your browser, and the weigh-in tracker saves entries only on your device. There's no account to create.

20 seconds

Start with your own numbers

Enter your age, height and weight. You'll see your daily burn, a calorie target and your protein floor, with the math right under it.

Run my numbers See GLP-1 tools
Run my numbers