eGFR Kidney Function Calculator
Estimate glomerular filtration rate using the standard CKD-EPI (2021) equation with staging diagnostics.
Mildly Decreased GFR (clinical observation required if kidney damage present)
This calculator utilizes the 2021 CKD-EPI creatinine equation, recommended by the American Society of Nephrology (ASN) and the National Kidney Foundation (NKF). This updated formula removes race coefficients to provide equitable, unbiased diagnostic accuracy.
Explore Additional Utilities
Anchor load — number of bolts ↔ force distribution
Analyze force distribution, load multiplication, and tri-axial angle forces across multiple anchor bolts.
Fragrance concentration — EDC ↔ EDT ↔ EDP ↔ parfum %
Calculate fragrance oil and diluent volumes/weights for Eau de Cologne, Toilette, Parfum, and Extrait profiles.
Envelope size — letter size ↔ envelope dimensions needed
Match standard paper formats and fold styles to commercial envelope dimensions with proper clearance parameters.
GSM ↔ oz per sq yard — fabric weight
Convert fabric weight between Grams per Square Meter (GSM) and ounces per square yard.
Firewood volume — cords ↔ cubic meters ↔ cubic feet
Convert between cords, face cords, steres, and cubic volumes. Compute solid wood volumes, green or dry weight, and thermal BTU outputs.
Carbon sequestration — tree species + size → kg CO2 stored
Estimate total green weight, dry organic biomass, carbon mass, and cumulative CO2 equivalent sequestered by an individual tree.
Carbonation volumes ↔ CO2 pressure ↔ temperature
Compute carbonation volumes of CO2 or determine draft regulator PSI settings based on storage temperature.
Battery capacity — Ah ↔ Wh ↔ days of autonomy
Convert between Amp-hours (Ah) and Watt-hours (Wh) and calculate battery bank backup days of autonomy based on loads.
Refractive index ↔ critical angle — fiber optic design
Determine the boundary reflection critical angles and Fresnel reflection losses for Total Internal Reflection.
Lumens & Bulb Wattage Equivalence
Compare light outputs in lumens with electrical consumption in bulb watts.
Supersonic Mach Speed
Assess sonic speed boundaries and atmospheric Mach velocities relative to local dry conditions.
ISO Week Number ↔ Calendar Date
Calculate ISO 8601 week numbers, week dates, and determine start/end weekdays of any given week year.
Ocean depth ↔ pressure — bar per 10 meters rule
Calculate hydrostatic and total pressure in the ocean based on depth, water density, and gravity constants.
Yeast pitch rate — batch volume + gravity → grams of yeast
Determine required yeast cell counts and dry yeast weight based on batch volume, wort gravity, and target pitch rates.
Thermal expansion coefficient — glaze fit calculation
Predict glaze-on-clay crazing or shivering by matching thermal expansion coefficients (COE).
Explosive charge weight — rock volume ↔ kg of explosive
Estimate required explosives (kg, lbs) for blasting a rock volume using powder factor models for open-pit mining.
Julian ↔ Gregorian Calendar
Convert between Julian Dates (JD, MJD) and standard Gregorian calendar dates with day of the year and century metrics.
Binding margin — page count ↔ spine width
Calculate book spine widths and safety margins based on total page count, binding method, and paper caliper thickness.
Original gravity ↔ potential ABV — beer brewing
Calculate alcohol by volume (ABV), attenuation percentages, and calorie estimations from Original and Final Gravity values.
Electricity Billing (kWh ↔ MJ)
Analyze electric billing kilowatt-hours and physical energy auditing megajoule metrics.