🧮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
Normal Distribution Z and Percentile Calculator
Converts a normal distribution value to standardized z score and estimates the cumulative percentile using error function approximation.
Poisson Probability Calculator
Computes probability of k occurrences in a Poisson distribution with mean lambda using the classic exponential factorial formula.
Binomial Probability Calculator
Computes probability of exactly k successes in n independent trials with probability p using binomial coefficient combination formula.
Sample Size Margin of Error Calculator
Computes minimum sample size for a proportion given desired margin of error and confidence level z score using standard formula.
Finite Population Sample Size Calculator
Computes sample size for a finite population N applying finite population correction with proportion p and confidence z score.
Aspect Ratio Image Video Calculator
Computes aspect ratio from width and height in pixels reducing to smallest integer ratio using greatest common divisor algorithm.
Frame Rate Edit Time Calculator
Computes total duration in hours minutes and seconds of an edited sequence from frame count and selected frames per second rate.
Render Time Frame Resolution Calculator
Estimates total render time for a sequence from average time per frame, total frames and resolution factor multiplier for scaling.
Video Bitrate Time Size Calculator
Computes video bitrate in megabits per second from file size in megabytes and total duration in seconds using standard 8 conversion.
Audio Bitrate Time Size Calculator
Computes audio bitrate in kilobits per second from file size in megabytes and total duration in seconds of the audio segment.
Pixel Resolution Image Size Calculator
Computes megapixels and estimates raw file size in megabytes from image width, height and bits per pixel color depth value.
Screenplay Script Time Format Calculator
Estimates screenplay running time in standard format using one page per minute baseline and dialogue density factor adjustment value.
Film Preproduction Time Calculator
Estimates film preproduction time from budget in millions and complexity score from one to five using industry production averages.
Film Postproduction Time Calculator
Estimates film postproduction time from shot hours and visual effects complexity level from one to five using industry average ratios.
Facade Orientation Sun Brazil Calculator
Suggests best main facade orientation in Brazil based on latitude for thermal comfort and natural daylight balance throughout the year.
Eave Solar Protection Brazil Calculator
Computes minimum eave overhang length to shade window from summer sun considering latitude and window opening height in meters.
Louver Cross Ventilation Calculator
Computes minimum louver opening area required to deliver target air changes per hour in cross ventilation from room volume and wind speed.
Ceiling Height Thermal Comfort Brazil Calculator
Suggests ideal ceiling height for thermal comfort in Brazilian rooms based on bioclimatic zone and room type using NBR recommendations.
Window Natural Light Area Calculator
Computes minimum window opening area for natural daylight based on floor area and lighting factor following NBR 15220 recommendation.
Garage Gate Vehicle Size Calculator
Computes minimum garage gate width and height based on vehicle type and recommended side clearance for passenger cars and pickup trucks.
Corridor Circulation Brazil Calculator
Suggests minimum residential and commercial corridor width based on use category and simultaneous people flow per hour NBR 9050.
Accessibility Ramp NBR 9050 Calculator
Computes minimum ramp length required for accessibility from height difference and maximum allowed slope percentage per NBR 9050 norm.
Stair Blondel Formula Calculator
Verifies stair riser and tread dimensions using Blondel formula and indicates whether values meet ergonomic comfort range for steps.
Parking Space Size Brazil Calculator
Suggests minimum garage parking space dimensions according to vehicle type and side column presence following NBR 9050 standards.
PCD Bathroom NBR 9050 Calculator
Suggests minimum accessible PCD bathroom dimensions according to fixture type and required transfer area following NBR 9050 norm.
Handrail Height Brazil Calculator
Suggests ideal handrail height for residential and public stairs based on user group and dual rule from NBR 9050 accessibility norm.
Parallel RLC Impedance Calculator
Computes the equivalent impedance of a parallel RLC circuit from R, L, C and frequency using complex admittance.
RLC Resonance Frequency Calculator
Computes the resonance frequency of a series RLC circuit using the Thomson formula with inductance and capacitance.
Capacitor RC Charge Time Calculator
Computes the time to charge a capacitor from the time constant tau equals R times C and the target percentage.
Inductor RL Charge Time Calculator
Computes the time for an inductor current to reach a percentage from the time constant tau equals L over R.
Capacitor Stored Energy Calculator
Computes the energy stored in a capacitor from capacitance in farads and voltage in volts using half C V squared.
Inductor Stored Energy Calculator
Computes the energy stored in an inductor from inductance in henrys and current in amperes using half L I squared.
RLC Quality Factor Q Calculator
Computes the quality factor Q of a series RLC circuit from R, L and C using the ratio between reactance and resistance.
Parallel Current Divider Calculator
Computes the current in each branch of a parallel current divider from the total current and two resistances.
Series Resistor Voltage Divider Calculator
Computes the voltage across each resistor in a series voltage divider from the input voltage and R1, R2 values.
Resistor Power Dissipation Calculator (Watts)
Computes the power dissipated in a resistor in watts from current and resistance or from voltage and resistance.
Transformer Voltage Ratio Calculator
Computes the secondary voltage of a transformer from primary voltage and the N1 and N2 turns ratio provided.
Power Supply Efficiency Calculator
Computes the percentage efficiency of a power supply from output power and input power in watts.
BR Tropical Hot and Cold Months Calculator
Classifies the months of an annual series into hot, mild and cold for the Brazilian tropical climate using monthly means.
Drought Rainfall Deficit Calculator (mm)
Estimates the accumulated rainfall deficit in millimeters and the duration of drought from monthly rainfall and historical mean.
Flood Rainfall Accumulation Calculator (mm)
Estimates flood duration from accumulated rainfall in millimeters over a few days and the basin drainage capacity.
BR Köppen Climate Classification Calculator
Classifies the climate type by Köppen using monthly average temperatures and accumulated annual precipitation in millimeters.
Thornthwaite Climate Classification Calculator
Classifies the climate type by Thornthwaite using the annual water balance in millimeters and potential evapotranspiration.
Thornthwaite Aridity Index Calculator
Computes the Thornthwaite aridity index from the annual water deficit and potential evapotranspiration in millimeters.
Monthly Rainfall Index Calculator (mm)
Computes the average monthly rainfall index from total annual rainfall in millimeters and the number of rainy months.
BR Annual Mean Temperature Calculator
Computes the annual mean temperature from the twelve monthly averages in degrees Celsius with indicative climate classification.
BR Max and Min Temperature Calculator
Identifies the maximum and minimum temperature of the annual series from the twelve monthly averages and computes annual amplitude.
BR Daily Thermal Amplitude Calculator
Computes the average daily thermal amplitude from daily maximum and minimum temperatures in degrees Celsius and classifies the result.
Penman-Monteith Evapotranspiration Calculator
Estimates reference evapotranspiration ETo by a simplified Penman-Monteith formula from temperature, wind and radiation.
River Flood Return Period Calculator (Years)
Computes the return period of a flood in years from the annual exceedance probability by the formula T equals one over P.
Rainfall Runoff Coefficient by Area Calculator
Computes the weighted average rainfall runoff coefficient from the areas and partial coefficients of each surface type.
Average Human Reaction Time Calculator
Estimates the average human reaction time in milliseconds from simple or choice stimulus and the individual attention level.
Auditory and Visual Response Time Calculator (ms)
Compares auditory and visual response time in milliseconds from typical means in psychology research.
Blink Rate per Minute on Screen Calculator
Estimates blinks per minute during screen use from the screen time and the reported concentration level.
REM Sleep Time by Phases Calculator
Computes the total REM sleep time during a night from total sleep hours and the number of complete ninety-minute cycles.
Deep Sleep Time by Phases Calculator
Computes the total deep sleep time during a night from total sleep hours and the typical percentage of stages three and four.
Typical Circadian Cycle Calculator (Hours)
Estimates the duration of the circadian cycle in hours from the chronotype reported by the user using mean values.
GAD-7 Anxiety Score Calculator
Computes the total GAD-7 score from the seven answers zero to three and classifies the anxiety level.
PHQ-9 Depression Score Calculator
Computes the total PHQ-9 score from the nine answers zero to three and classifies the level of depressive symptoms.
PSS-10 Stress Score Calculator
Computes the total Perceived Stress Scale PSS-10 score from the ten answers and classifies current stress level.