Free, fast, and accurate calculators for health, finance, math, nutrition, and everyday life — all in one place.
Our most-used tool — calculate your Body Mass Index with instant health insights.
Know your Body Mass Index in seconds. Supports all three unit systems, a visual gauge, and personalized health guidance based on WHO standards.
Trusted tools for health, finance, nutrition, math & more — all free.
Trusted, accurate tools for health, finance, nutrition, and everyday decisions — all free, no login required.
Body Mass Index with metric, US, or mixed units. Visual gauge & WHO guidance.
Open →Daily calorie needs using Mifflin-St Jeor. Includes BMR, TDEE, and macro estimates.
Open →Estimate body fat using the US Navy tape-measure circumference method.
Open →Healthy weight range using 4 medical formulas — Devine, Robinson, Miller, Hamwi.
Open →Max heart rate and 5 training zones using Tanaka or Karvonen formula.
Open →ABCP tape method estimate with standards-style categories and guidance.
Open →Estimate lean mass with Boer, James, and Hume formulas.
Open →Estimate 1RM from reps and weight using popular strength formulas.
Open →IOM-based recommended weight gain range by BMI and trimester.
Open →BSA in \(m^2\) using standard medical formulas and unit support.
Open →Monthly installments, total interest, and full loan cost for any loan type.
Open →Detailed loan EMI view with deeper breakdown and amortization-style details.
Open →Car payment, total interest, and total cost for any vehicle loan.
Open →Compare dealer offers to find the cheapest option over time.
Open →Investment growth with contributions. Year-by-year breakdown table.
Open →Monthly mortgage PITI — principal, interest, tax, and insurance breakdown.
Open →Break-even analysis to compare renting and buying a home.
Open →Estimate payments and cost for a home equity loan or second lien.
Open →Future value of deposits with growth projections over time.
Open →Plan savings to retirement with contributions, growth, and timeline.
Open →Find APR from payment, principal, and term (reverse loan calc).
Open →See how purchasing power changes over time with inflation.
Open →Payoff timeline and total interest based on balance, APR, and payment.
Open →US federal income tax estimator for 2024 with bracket-by-bracket breakdown.
Open →Return on investment, net profit, CAGR, and annualized return for any asset.
Open →Least common multiple for two or more integers — exact big-integer math.
Open →Greatest common factor (GCD) for multiple whole numbers.
Open →Summary statistics from any list of numbers.
Open →Exact nPr and nCr counts with big integers.
Open →Four types: X% of Y, what % is X of Y, percentage change, and reverse.
Open →Exact age in years, months, days, and hours. Next birthday countdown included.
Open →Total daily energy expenditure — your true maintenance calorie target.
Open →Daily protein, carbs, and fat targets with visual progress bars and diet presets.
Open →Personalized daily hydration target based on weight, activity, and climate.
Open →Calculate tip and split bills for any group size with preset percentages.
Open →Trip fuel cost in MPG or L/100km with monthly and annual projections.
Open →Weighted GPA on a 4.0 scale — add courses, grades, and credit hours.
Open →Sin, cos, tan, log, sqrt, powers, factorial — history & keyboard.
Open →Length, weight, temperature, volume, speed — live two-dropdown conversion.
Open →Day differences, add/subtract days, day-of-week finder.
Open →Mifflin-St Jeor, Harris-Benedict & Katch-McArdle side by side.
Open →Comma-separated list → mean, median, mode, variance, σ.
Open →Add, subtract, multiply, divide — mixed numbers & steps.
Open →Annual / monthly / weekly / hourly plus rough US take-home.
Open →LMP or conception → due date, week, trimester, milestones.
Open →Weighted averages & “what score do I need?” reverse calc.
Open →Wake time or bedtime → ideal sleep times using 90-minute cycles.
Open →Search by name or topic, or click a tag below.
We obsess over accuracy, speed, and experience so every calculation is effortless.
All calculators run instantly in your browser — no loading, no page reloads, no waiting.
Every formula is based on established standards — WHO, CDC, or recognized financial models.
Designed for any screen — phone, tablet, or desktop — with no pinching or zooming needed.
We never collect or store your inputs. Everything you calculate stays on your device.