SILDIL - Free Online Calculators for Finance, Math, Health & More

Free BMI calculator with healthy weight range, BMI Prime, Ponderal Index, a visual BMI scale, target/reverse BMI, optional two-person comparison, and a browser-only BMI trend tracker. Includes an adult and a child/teen mode.

Health Calculators

BMI Calculator

Calculate your real 2026 take-home pay: progressive federal tax brackets, Social Security, Medicare, state and local tax, 401(k)/HSA impact, bonus withholding, and salary/raise comparisons — for all 50 states.

Financial Calculators

US Salary & Paycheck Calculator

Calculate the circumference of a circle from its radius or diameter. Find radius and diameter from circumference, use circle formulas, and see step-by-step calculations.

Math Calculators

Circumference Calculator

Free SaaS burn rate calculator. Enter cash, MRR, expenses, and hiring plans to calculate exact runway in months, growth-adjusted break-even, and default alive vs default dead status.

Financial Calculators

SaaS Burn Rate & Runway Forecaster

Free 16:9 aspect ratio calculator. Find width or height for widescreen HD/4K video, monitors, and YouTube. Supports 1920x1080, 1280x720, and any custom dimension. Includes pixel count and diagonal.

Calculators

16:9 Aspect Ratio Calculator

Free aspect ratio calculator. Find the aspect ratio from width and height, or calculate a missing width or height from a known ratio. Supports 16:9, 4:3, 21:9, 3:2, 1:1 and any custom ratio, with diagonal length and nearest-standard matching.

Calculators

Aspect Ratio Calculator

Calculate your estimated 1 rep max from weight and reps using multiple formulas, then view 1RM percentages, training weights, rep estimates, and a complete strength matrix.

Health Calculators

1RM Calculator

Calculate concrete blocks, wall area, courses, openings, mortar, grout, waste, pallets, weight, reinforcement quantities, and project cost for CMU walls.

Calculators

Concrete Block Calculator

Use this concrete calculator to estimate volume, cubic yards, bags, and waste. Perfect for figuring concrete needs, Quikrete calculations, concrete slab cost, and concrete floor cost estimates.

Calculators

Concrete Calculator

Calculate matrix addition, subtraction, multiplication, determinants, inverses, transpose, and more with customizable rows and columns and step-by-step solutions.

Math Calculators

Matrix Calculator

Use this sleep pattern calculator and circadian calculator to find your ideal bedtime. Features a 90 minute sleep cycle calculator, sleep calculator by age, and insights for ADHD circadian rhythm and REM sleep.

Health Calculators

Sleep Cycle Calculator

Find the least common multiple of two or more numbers with step-by-step solutions, prime factorization, GCD, formulas, and common multiples.

Math Calculators

LCM Calculator

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