How to choose (3 steps)
- Start with BMI for a simple weight/height overview.
- For daily calories, use the calorie planner.
- For a body fat estimate, use the body fat calculator.
- For training intensity, check heart rate zones.
Note: Results are for educational use only and may not reflect medical advice.
Recommended (top 3)
If you are unsure where to start, these cover the most common tasks.
Calculators
- BMI calculator (kg/cm) – BMI & WHO category | CalcBE
Enter weight (kg) and height (cm) to get your BMI and WHO category instantly. Copy a shareable result link. Informational only—not medical advice.
- Body Fat Percentage Calculator | US Navy & BMI | CalcBE
Estimate your body fat percentage using US Navy circumference and BMI (Deurenberg) methods. Switch between metric and US units, see estimated fat and lean mass, and use this free calculator to track your fitness and h…
- Calorie & Weight-loss Planner | TDEE, Targets, Timeline | CalcBE
Estimate your TDEE, set a calorie target to hit your goal weight by a chosen date, or see how long it will take at your current intake. Includes macro split guidance. Informational only.
- Ideal weight calculator – Devine, Hamwi and BMI ranges for adults | CalcBE
Estimate ideal body weight with the Devine, Hamwi, Robinson and Miller formulas, set a custom BMI goal, and compare kg/lb outputs. Informational only.
- Heart Rate Zone Calculator | CalcBE
Calculate heart rate training zones (Zone 1-5) with %HRmax, Karvonen (HRR), or optional %LTHR. Age-based HRmax estimates, Zone 2 highlight, copy/share, and custom boundaries included.
- Due Date Calculator (LMP, IVF, Ultrasound) | CalcBE
Estimate your due date and today’s gestational age from LMP, conception, IVF transfer, or ultrasound. Shows trimester milestones. Planning only.
- 1RM (One-Rep Max) & Training Weight Calculator | CalcBE
Estimate your 1RM from weight and reps using common formulas, then convert to training weights by %1RM or target reps. Includes rounding options and Training Max (TM).
- 2D geometry calculator – area & perimeter of shapes | CalcBE
Compute area and perimeter for rectangles, circles, triangles, trapezoids and regular polygons from side lengths, radii or heights, with formulas shown for homework and quick design checks.
- 2D graphing calculator – plot and intersect functions | CalcBE
Plot up to three functions, find intercepts, intersections and extrema numerically, and explore the graph with zoom, pan, shareable URLs and clear step-by-step logs.
- 3D Geometry Calculator (Sphere, Cylinder, Cone, Prism) | CalcBE
Compute volume and surface area for spheres, cylinders, cones, rectangular and regular prisms—with example inputs, step-by-step formulas, and a shareable result link.
- Acid-base titration curve and pH calculator
Free acid-base titration calculator for strong and weak acids and bases. Compute pH at any point and generate titration curves with step-by-step explanations.
- Acid–base pH calculator (strong & weak acids and bases) | CalcBE
Solve pH and pOH for strong and weak acids and bases and for strong acid–strong base mixtures, with clear steps and shareable URLs.
- Acid–base titration curve calculator – pH vs volume with worked steps | CalcBE
Plot strong and weak acid–base titration curves, highlight buffer regions and equivalence points, and review the Henderson–Hasselbalch or hydrolysis steps behind each segment.
- Age Calculator from Date of Birth (Years, Months, Days) | CalcBE
Calculate your age from your date of birth: years, months, days, and days until your next birthday. Optional reference date and shareable result link.
- Algebra simplifier with colors for like terms | CalcBE
Expand with distribution, color-match like terms, and simplify step by step. See sign flips, teacher mode, shareable URL, LaTeX copy, and SVG export all in your browser.
- APR to APY (EAR) Calculator — monthly and daily rates | CalcBE
Convert APR to APY/EAR and monthly or daily rates, or reverse the calculation to compare loans, credit cards, and savings. Includes presets and shareable URLs.
- Arithmetic & Geometric Sequence Calculator | CalcBE
Compute the nth term, partial sum, common difference or ratio, and number of terms for arithmetic and geometric sequences. Shows formulas, steps, term previews, and infinite geometric series when |r| < 1.
- Base Converter & Bitwise Toolkit (Bin/Oct/Dec/Hex) | CalcBE
Convert between binary, octal, decimal, and hexadecimal, and run AND/OR/XOR/NOT and bit shifts—then copy a shareable result link.
- Beer-Lambert law calculator and calibration curve (A = εlc)
Free online Beer-Lambert law calculator for absorbance, concentration, molar absorptivity, path length, and calibration curves. Great for general chemistry and lab reports.
- Bell numbers table with Stirling relations | CalcBE
Generate a Bell numbers table B(n) and confirm the relation B(n)=ΣS(n,k). Includes exact BigInt or modulo mode, CSV/TSV export, Stirling tabs, and shareable URLs.
- Birthday paradox (collision probability) calculator | CalcBE
Calculate the birthday paradox collision probability with exact math + a Monte Carlo simulator. Get P(collision), P(no collision), a Poisson approximation with error, and the required sample size n for a target probab…
- Biweekly Loan Amortization Schedule (CSV Export)
Compute a biweekly amortization schedule (26 payments/year), include extra payments, and export the table to CSV.
- BMR & TDEE calculator – daily calorie needs and energy use | CalcBE
Estimate your basal metabolic rate and total daily energy expenditure with the Mifflin-St Jeor equation. Enter your age, sex, height, weight and activity level to see maintenance calories.
- Break-even Point and Required Sales Calculator | CalcBE
Calculate the break-even point, required sales to reach a target profit, and profit at your planned sales volume. Simple break-even analysis for small businesses.
- Buffer pH (Henderson–Hasselbalch) with steps — design, additions, capacity | CalcBE
Compute buffer pH with the Henderson–Hasselbalch equation, design mixtures for a target pH, and model strong acid/base additions with buffer capacity and step-by-step logs.
- Business Days & Countdown Calculator | Skip Weekends | CalcBE
Count calendar or business days between two dates, exclude custom weekend patterns and holiday lists, and jump forward or backward by N business days. Copy a shareable URL for the full setup.
- Calorimetry calculator (specific heat, heat, final temperature)
Free calorimetry calculator to find heat, specific heat, temperature change, and final equilibrium temperature when mixing two substances.
- Catalan number explorer - Dyck paths & trees | CalcBE
Explore Catalan numbers C_n with exact BigInt or modulo tables, then enumerate or uniformly sample Dyck words, Dyck paths, and full binary trees. Export CSV or share URLs with seeds for reproducible examples.
- Catalyst loading calculator – mol%, ppm, eq to mass/volume | CalcBE
Convert catalyst loading between eq, mol% and ppm/ppb, calculate required mass or volume from a base amount, and share the setup by URL.
- CGPA ↔ Percentage Converter (Educational)
Convert between CGPA and percentage using example mappings (9.5×CGPA or 10×CGPA). Institutions differ—always confirm your institution’s rule.