SymbolWiki

Calculators

Financial, health, math, and more — fast calculators with a consistent experience in English, French, Spanish, and Russian.

Financial Calculators

Loans, interest, budgets, and other money math.

Fitness and Health Calculators

BMI, calories, heart rate zones, and wellness metrics.

Math Calculators

Percentages, geometry, conversions, and homework helpers.

Other Calculators

Handy tools that do not fit the other categories.

All Calculators

Fraction Calculator

Add, subtract, multiply, divide, simplify, and convert fractions including mixed and big-number modes.

Percentage Calculator

Solve percentage equation, common phrase percent questions, percentage difference, and percentage change.

Random Number Generator

Generate random integers or decimals with range, count, precision, uniqueness, sorting, and animated reveal.

Percent Error Calculator

Calculate signed and absolute percent error from observed and true values with step-by-step formula breakdown.

Exponent Calculator

Solve for base, exponent, or result in b^x = y with optional e-base mode and step-by-step output.

Binary Calculator

Binary add/subtract/multiply/divide plus binary-decimal and decimal-binary conversions in one page.

Hex Calculator

Hex add/subtract/multiply/divide plus hex-decimal and decimal-hex conversions on one page.

Half-Life Calculator

Solve exponential decay for N, N₀, time, or half-life; convert between T₁/₂, τ, and λ.

Quadratic Formula Calculator

Solve ax^2 + bx + c = 0 with fraction support, discriminant analysis, and step-by-step roots.

Log Calculator

Evaluate y = log_b(x) with arbitrary base, domain validation, and verification line b^y = x.

Ratio Calculator

Solve A:B = C:D and scale ratios up or down while preserving proportional relationships.

Root Calculator

Square root, cube root, and nth root in one page with real-number domain checks.

Least Common Multiple Calculator

Find LCM and GCD from comma-separated integers with prime-factorization steps.

Greatest Common Factor Calculator

Find GCF from comma-separated integers with prime-factorization steps and companion LCM output.

Factor Calculator

Find factors, factor pairs, and prime factorization for an integer with a simple factor-tree style output.

BMI Calculator

Body Mass Index from height and weight (metric).

Calorie Calculator

Estimate daily calories to maintain, lose, or gain weight.

Calories Burned Calculator

Estimate calories burned by duration or by distance for walking, running, and cycling.

Body Fat Calculator

Estimate body fat % with U.S. Navy and BMI methods.

BMR Calculator

Estimate BMR and daily calorie needs by activity level.

Ideal Weight Calculator

Compare popular ideal body weight formulas by height and sex.

Healthy Weight Calculator

Body-weight range for BMI 18.5–25 from height (adults).

Pace Calculator

Estimate pace, time, distance, and projected finish time.

Army Body Fat Calculator

Estimate Army-style body-fat screening and compare with age standards.

Lean Body Mass Calculator

Estimate lean body mass with Boer, James, Hume, and Peters formulas.

One Rep Max Calculator

Estimate 1RM from submaximal sets with Epley, Brzycki, or Lombardi—tables and chart included.

Target Heart Rate Calculator

Karvonen zones from age and optional resting HR, plus Haskell, Tanaka, or Nes max-HR formulas.

Pregnancy Calculator

Due date, week-by-week schedule, trimesters, milestones, and progress—like classic pregnancy tools.

Pregnancy Weight Gain Calculator

IOM-style recommended gain by pre-pregnancy BMI, shaded week chart, and full week-by-week table.

Pregnancy Conception Calculator

Most probable and possible conception and intercourse windows from due date, LMP, or ultrasound.

Due Date Calculator

EDD from last period, ultrasound, conception date, or IVF transfer (day 3 / 5 / 6 embryo).

Ovulation Calculator

Ovulation window, fertile days, next periods, and projected due date—plus a 6-cycle table.

Conception Calculator

Most probable conception days, ovulation window, best intercourse timing, test date, next period, due date—calendar + 6 cycles.

Period Calculator

Three-month calendar with period vs ovulation days, navigation, and six-cycle date table.

Macro Calculator

Daily calories and macro ranges with tabbed styles: Balanced, Low Fat, Low Carb, High Protein, and Custom.

Carbohydrate Calculator

Estimate daily carbohydrate grams from calorie targets with a goal table at 40%, 55%, 65%, and 75%.

Protein Calculator

Estimate daily protein grams using weight-based and calorie-percent recommendation ranges.

Fat Intake Calculator

Estimate daily total fat range (20-35%) and saturated-fat ceilings (10% and 7%) across maintenance, loss, and gain calories.

TDEE Calculator

Estimate maintenance calories (TDEE), BMI context, and practical calorie targets for loss or gain.

GFR Calculator

Estimate adult and pediatric eGFR from serum creatinine with multiple comparison formulas.

Body Type Calculator

Classify body shape from bust, waist, high-hip, and hip measures, with waist-hip ratio (WHR).

Body Surface Area Calculator

Estimate body surface area using multiple formulas and compare outputs in m2, ft2, and in2.

BAC Calculator

Estimate blood alcohol concentration (BAC), time to 0%, and impairment status from drinking inputs.