🧮Calculators
Calculators cover finance, health, math, physics, engineering and everyday life: interest and loans, net salary, BMI, rule of three, conversions and more. Results are informational and educational — for important decisions, confirm with a professional and official sources.
2826 tools
MBI-3 Burnout Score Calculator
Computes the simplified MBI-3 burnout scale score from the three subscales and classifies overall risk.
Forgetting Curve Memorization Time Calculator
Estimates the ideal Ebbinghaus review interval from the number of previous repetitions and the desired retention level.
Experience Curve Learning Time Calculator
Estimates the time needed to master a task from the Henderson experience curve and the target number of repetitions.
Sous-vide Time by Temperature and Thickness
Computes sous-vide cooking time in minutes from meat thickness in centimeters and water bath temperature in Celsius.
Sous-vide Chicken Pasteurization Time
Computes the sous-vide pasteurization time for chicken from thickness and water bath temperature ensuring pathogen reduction.
Pressure Cooker Cooking Time Calculator
Estimates pressure cooker cooking time from food type and weight using conventional Brazilian tables.
Agar Gelling Percentage Amount Calculator
Computes the amount of agar-agar in grams for a target gelling from the volume of liquid in milliliters and the desired percentage.
Xanthan Thickener Percentage Amount Calculator
Computes the amount of xanthan gum in grams for a target thickening from the liquid volume and the recommended percentage.
Lecithin Foam Percentage Amount Calculator
Computes the amount of soy lecithin in grams to generate foam from the volume of liquid in milliliters and the target percentage.
Alginate Spherification Percentage Amount Calculator
Computes the amount of sodium alginate in grams for spherification from the base liquid volume and the recommended percentage.
Maltodextrin Texture Percentage Amount Calculator
Computes the amount of maltodextrin in grams to turn fats into powder from oil weight and the target percentage.
Isomalt Decor Percentage Amount Calculator
Computes the amount of isomalt in grams for sugar decoration from the desired volume and the percentage of added water.
Glucose Crystallization Percentage Amount Calculator
Computes the amount of glucose in grams to avoid crystallization of syrup from sucrose weight and the target percentage.
Smoking Time by Temperature and Wood Type Calculator
Estimates the smoking time in hours from wood type, weight of the piece and smoker temperature in Celsius.
Dry-cured Meat Time by Temperature Calculator
Estimates the curing time of dry-cured meat in days from cut thickness, salt percentage and chamber temperature in Celsius.
Stefan-Boltzmann Law Calculator
Computes radiated power per unit area (j = εσT⁴) — used in astrophysics and thermal radiation problems.
Relativistic Mass Calculator
Calculates relativistic mass m = m₀/√(1−v²/c²) given rest mass and velocity as a fraction of c.
Time Dilation Calculator
Calculates dilated time for a moving observer (twin effect) from proper time and velocity (fraction of c).
Cosmological Redshift Calculator
Converts between redshift z, recession velocity and distance using a simplified Hubble law.
Surface Gravity Calculator
Calculates surface gravitational acceleration of any planet given its mass and radius (g = GM/r²).
Stellar Habitable Zone Calculator
Estimates inner and outer radii of a star's habitable zone from luminosity relative to the Sun.
Planet Average Density Calculator
Computes a planet's mean density from mass and radius — classifies as rocky, icy or gas giant.
1RM (One Rep Max) Calculator
Estimates 1RM using Epley, Brzycki, Lander and Lombardi formulas with a median comparison across them.
VO2 max — Cooper Test Calculator
Estimates VO2 max from the distance covered in a 12-minute Cooper test — cardiorespiratory fitness metric.
Heart Rate Zones (Karvonen) Calculator
Computes the 5 training zones using the Karvonen method with resting HR and estimated max HR.
Calorie Deficit / Surplus Calculator
Calculates the calorie deficit or surplus needed to gain or lose X kg over N weeks — 7700 kcal/kg basis.
Weekly Training Volume per Muscle Group
Adds weekly sets per muscle group and classifies as low, moderate or high volume.
RIR / RPE Conversion Calculator
Converts between RIR (Reps in Reserve) and RPE (Rate of Perceived Exertion) for strength training.
Cycling Cadence to Speed Calculator
Computes cycling speed from cadence (rpm), chainring, cassette teeth and wheel diameter.
Trail Hiking Time (Naismith) Calculator
Estimates trail hiking time using Naismith's rule (distance plus elevation gain) with pack adjustment.
Borg Perceived Exertion Scale Calculator
Shows the Borg RPE scale (6-20) and maps it to approximate target heart rate based on age.
Festa Junina Quadrilha Budget
Estimates a Festa Junina party budget per guest including food, drinks and decoration.
Carnival Block Budget
Estimates a Brazilian carnival block party budget including costumes, band and infrastructure.
Feijao Tropeiro Per Person
Computes ideal Feijao Tropeiro quantity per person for a Minas Gerais event.
Feijoada Per Person
Computes ideal Brazilian feijoada quantity per person for a weekend lunch.
Acaraje Event (Bahia)
Computes acaraje quantity for a Bahia event per guest with feijao fradinho dough.
Cuiaba Hot Days Per Month
Estimates days per month in Cuiaba above 38 Celsius (thermal risk).
CD-RISC-10 Resilience Score
Computes the Connor-Davidson Resilience Scale 10-item score from items 0-4.
LOT-R Optimism Score
Computes the Life Orientation Test Revised (LOT-R) optimism score from 6 items 0-4.
GSE Self-Efficacy Score
Computes the General Self-Efficacy Scale (GSE) score from 10 items 1-4.
MAAS Mindfulness Score
Computes the Mindfulness Attention Awareness Scale score from 15 items 1-6 (higher = more mindful).
Core Flow State Scale Score
Computes the Core Flow State Scale short form from 9 items 1-5.
GQ-6 Gratitude Score
Computes the Gratitude Questionnaire 6-item (GQ-6) score on a 1-7 scale.
FMPS Perfectionism Score
Computes short Frost Multidimensional Perfectionism Scale score from 8 items 1-5.
SCS Self-Compassion Score
Computes the Self-Compassion Scale short form (12 items) score on a 1-5 scale.
Rosenberg Self-Esteem Scale Score
Calculate your Rosenberg Self-Esteem Scale (RSES) score, the most widely used 10-item questionnaire for measuring global self-esteem.
UCLA Loneliness Scale Score
Computes the UCLA Loneliness Scale 3-item short version score (1-3).
Satisfaction with Life Scale (SWLS)
Calculate your Satisfaction with Life Scale (SWLS) score, a widely used 5-item questionnaire in psychology for measuring subjective well-being.
ECR-R Attachment Score
Computes a short Experiences in Close Relationships-Revised score from 8 items 1-7.
Bahia Rip Current Hours
Estimates dangerous rip current hours per month at Bahia coast.
Cabo Frio Tide Cycle
Computes Cabo Frio average tidal cycle and hours to next high tide.
Fortaleza Storm Days Per Month
Estimates rainy storm days per month in Fortaleza city.
Fish School Volume Count
Estimates number of fish in a school given the school volume in liters.
Fishing Hook Time by Bait Type
Estimates average hook-in-water wait time per bait type (live, artificial, mass).
Fishing Rod Lifetime by Weight
Estimates fishing rod lifetime in hours given material and average fish weight.
Fishing Net Mesh by Fish Size
Recommends fishing net mesh size in cm based on target fish length.
Fishing Baits Per Day
Estimates bait quantity needed for a fishing day given hours and bait type.
Fishing Hooks by Type
Estimates number of hooks to bring for a fishing trip by location type.
Fishing Sea Sinker Weight
Estimates required fishing sinker weight given depth and current strength.
Dive Bottom Time by Depth
Computes recreational no-deco bottom time per PADI Recreational Dive Planner tables.