Free Health Calculators
Most health apps tell you what you want to hear. A flattering estimate. A hopeful date. A number that makes you feel good enough to close the tab and forget it.
BluntCalc tools give you what the math actually says — probability ranges, real risk scores, brutal comparisons. No sugarcoating. No motivation porn. Just data.
SEE THE CALCULATORS →The Calculators
Realistic Weight Loss Timeline Calculator
Skip the single fake date. HonestSlim runs 5,000 Monte Carlo simulations and shows you a fan chart of actual outcomes — including the ones where you plateau, slip, and crawl back. Because weight loss isn't deterministic.
USE HONESTSLIM →Insulin Resistance Risk Calculator
One measurement. One uncomfortable truth. Enter your waist and height — get a risk score based on the same metric validated in 300,000+ people. 88% of US adults have some form of metabolic dysfunction. Most have no idea. Do you?
USE INRESRISK →Cigarette Cost Calculator
You've never added it up. A pack a day at $10 for 20 years is $73,000 — enough for a car, a down payment, or a retirement account. SmokelLoss does the math and shows you exactly what your habit cost in real-world terms.
USE SMOKELOSS →"THE TRUTH DOESN'T DEMOTIVATE YOU. FINDING OUT TOO LATE DOES."
— BLUNTCALC MANIFESTO
From the Blog
Every app gives you a date. None of them give you a range. Here's why that single number is mathematically dishonest — and what to use instead.
Read more → Metabolic Health · Jun 202688% of US adults have some form of metabolic dysfunction. Most have no idea. Here's a tape-measure test validated in 300,000+ people.
Read more → Smoking · Jun 2026A pack a day at $10 for 20 years is $73,000. Most smokers have never done this math. Here's the number — and what it could have been.
Read more →