Exposure Triangle & F-Stop
Calculate absolute f-stop adjustments, exposure reciprocity tradeoffs, and sensor noise tradeoffs.
✨ Perfect Balance! Scenario B will render identical image exposure matching Scenario A (Equivalent Triangle Reciprocity).
Explore Additional Utilities
Sample size calculator — confidence level ↔ margin of error
Determine required sample sizes for research surveys or experiments based on population size, confidence levels, and target margin of error.
Yarn Weight Converter
Convert yarn sizes across WPI (Wraps Per Inch), ply, and standard weight categories.
Bullet drop — distance ↔ inches ↔ cm at given range
Estimate bullet drop trajectories over distance based on muzzle velocity, projectile mass, and gravitational pull.
Encoder resolution (PPR ↔ degrees per pulse)
Convert between encoder Pulses Per Revolution (PPR), Cycles Per Revolution (CPR), and angular resolution down to arcseconds.
Snowpack depth ↔ water equivalent — avalanche assessment
Calculate Snow Water Equivalent (SWE) and snow density to assess avalanche loading and snowpack stability.
Tolerance converter (ISO fit classes ↔ clearance)
Find upper and lower deviation limits for shaft and hole ISO 286 fit classes like H7, g6, f7, and compute clearances in microns or mm.
Barometric Pressure Tendency Analyzer
Analyze changes in barometric pressure over time to predict short-term local weather trends.
Coffee Brewing Ratio Calculator
Determine the perfect coffee-to-water brewing ratio based on grams of coffee, milliliters of water, and cup size.
Water hammer pressure — velocity ↔ pressure spike
Determine the maximum instantaneous water hammer pressure shockwave surge from sudden flow velocity shutdowns.
Hot water demand — occupants ↔ liters per hour needed
Estimate peak hot water demand in liters per hour and size standard water heater tanks or tankless flow rates.
Scale factor (model size ↔ real world)
Convert dimensions between model design sizes and physical real-world scale targets, including imperial/metric conversions.
Air changes per hour — room volume ↔ fan capacity
Evaluate active ventilation air changes per hour (ACH) based on blower CFM capacity and physical room volume.
Cooling load — room size ↔ BTU ↔ tons of refrigeration
Calculate room-by-room air conditioner cooling load requirements in BTU, tons, and kilowatts based on area, insulation, and occupants.
Wind Chill Calculator
Determine the feels-like wind chill index from ambient air temperature and wind speed.
Sail area ↔ displacement ratio
Calculate Sail Area to Displacement Ratio (SADR) to evaluate a sailboat’s performance characteristics, speed potential, and light-wind capability.
Twist rate — caliber ↔ bullet length → stabilization
Calculate the optimal barrel rifling twist rate needed to stabilize a bullet of a given length, caliber, and velocity.
Soil Plasticity Index Calculator
Calculate Plasticity Index (PI) from Liquid Limit (LL) and Plastic Limit (PL), and interpret soil state using the Atterberg limits chart.
NPK Fertilizer Blend Designer
Calculate exact commercial fertilizer weights (Nitrogen, Phosphate, Potash) required to hit crop nutrient targets.
Power reserve — mainspring tension ↔ hours of run time
Compute total mainspring operational run time based on turns of wind, barrel capacity, and balance wheel beat rate demands.
Ammonia toxicity — total ammonia ↔ pH ↔ toxic fraction
Calculate the highly toxic un-ionized ammonia (NH3) fraction from Total Ammonia Nitrogen (TAN), pH, and water temperature.