Apps Like NPKalc - Fertilizer Calculator for iPhone and iPad
Calculate doses and units
Calculate requirements for granular and liquid types using various unit measurements. Input soil test results and desired nutrient levels. pplication rates for lawns, gardens, and crops. Export results for record-keeping.
by Barton Cone★ 4.39 ratingsUtilitiesFreeData updated 2026-09-06
Calculate VO₂ Max, Maximum Heart Rate (MHR), and Target Heart Rate (THR) zones using scientific formulas. Input age, gender, and resting heart rate to estimate values. Set and track heart rate zones for workouts. Export results for review.
Perform basic calculations with a clean interface. Input numbers and operators to solve equations. Save frequently used calculations. Share results via copy or email.
Units across categories like length, mass, data, area, and temperature. Select from numerous units within each category. Save frequently used conversions. Share results via copy or email.
Convert units of length, temperature, mass, and more. Switch between metric and imperial systems. Input values and receive instant, accurate results. Save frequently used conversions for quick access.
Calculate chemical dosages for chlorine, pH, and alkalinity with precise formulas. Get smart recommendations for balancing water. Track chemical levels and maintenance schedules. Export data for records or sharing.
Hexadecimal and binary calculators allow users to perform arithmetic and bitwise operations. Convert between number systems and view results in decimal, hexadecimal, and binary formats. Save and share calculation history.
The app converts between units in categories like length, temperature, and weight. It provides access to previous conversions through a history list with color-coded categories.
Emit high-frequency tones for testing or experimentation
Play high-frequency tones to test speaker performance or experiment with audio effects. Use specific sound patterns to assist with ejection. Adjust frequency settings and monitor output levels.
Calculate antiderivatives for mathematical functions including trigonometric and logarithmic types. Solve integrals step-by-step. Display results and explanations. Save and review calculations.
Calculate pump output, MASP, GOR, and tank strapping with unit selectors and input validation. Access Drilling, Production, Reservoir, and Terminal/Trading modules. Retrieve step-by-step formulas, unit conversions, and context summaries.
Calculate between two or three sets of numerical data. Input data via slider or keypad for precise values. View results and analyze relationships between datasets.
Convert units across categories like length, weight, temperature, and volume. Select units, input values, and receive instant results. Access a comprehensive list of measurement systems. Share results via email or copy to clipboard.
Identify soybean phenological stages and nutrient absorption levels in crops. Access interpretation tables for soil and leaf analysis. Track nutrient absorption progress through growth stages.