New tools

Estimate your body fat percentage with the U.S. Navy method from body measurements, then see your fat mass and lean body mass.

Estimate lean body mass with Boer, James and Hume, with an optional comparison from a known body-fat percentage.

Calculate FFMI, height-normalized FFMI and FMI from height, weight and body-fat percentage.

Calculate your running pace, finish time or distance, predict race times from 5K to marathon and get your split times, in miles or kilometres.

Estimate your basal metabolic rate in kcal and kJ, and compare the Mifflin-St Jeor, Harris-Benedict and Katch-McArdle equations.

Work out your bra size from your underbust and bust measurements, with UK, US, EU, French, Italian and Australian sizes and sister sizes.

Calculate your maximum heart rate (Tanaka, 220 − age, Gulati) and your five training zones, with the Karvonen method if you know your resting heart rate.

Calculate your body mass index from height and weight, with adult reference ranges and clearly explained limitations.

Estimate your total daily energy expenditure from your activity, compare the five levels and get guideline intakes for each weight goal.

Find your ideal weight for your height: healthy BMI range and the Devine, Robinson, Miller, Hamwi, Lorentz, Broca, Creff and Monnerot-Dumaine formulas.

Calculate your waist-to-hip ratio, place your waist size on the WHO cut-offs and, with your height, get the waist-to-height ratio recommended by NICE.

Calculate body surface area in m² from height and weight, with the Mosteller, Du Bois, Haycock, Gehan-George and Boyd formulas.

Calculate a weighted average and the next grade needed to reach your target.

Calculate the Spanish university access grade out of 10 and admission grade out of 14.

Calculate the Portuguese nota de candidatura on the 0–200 scale.

Calculate the Italian Maturità final score out of 100.

Calculate your IB score out of 45 and check the main Diploma passing criteria.

Calculate UCAS points for A levels, AS levels and the EPQ.

Convert ECTS credits into study workload and track progress toward a credit target.

Simulate your 2027 French Bac average, result, honours and the grades you still need.

Calculate your 2027 DNB average, result, honours and the grades you still need.

Calculate average CAC and the payback period for customer acquisition spend.

Estimate LTV from monthly revenue, gross margin, and monthly churn.

Calculate monthly burn rate and the number of months of cash runway remaining.

Calculate annual inventory turnover and average days of inventory.

Calculate DIO, DSO, DPO, and cash conversion cycle days.

Validate JSON-LD syntax and detect types, entities, and structural warnings.

Classify internal, external, and relative HTML links and inspect nofollow, sponsored, and ugc.

Compare two sitemaps or URL lists and identify added and removed URLs.

Measure term frequency, phrase occurrences, and density in text or HTML.

Generate 301 rules for Apache, Nginx, Netlify, or Vercel from a URL mapping.

Compute an HMAC-SHA-1, SHA-256, SHA-384 or SHA-512 in hex or Base64 and verify a webhook signature.

Encrypt and decrypt text with a password using AES-256-GCM, right in your browser.

Decode a PEM X.509 certificate or CSR: subject, issuer, dates, SANs, public key and SHA-256 fingerprint.

Derive a salted PBKDF2-SHA-256 or SHA-512 password hash, or verify a password against an encoded value.

Generate secure random tokens from 8 to 256 bytes in hex, Base64 or Base64URL, with an optional prefix.

Generate a PKCE code_verifier, its S256 code_challenge and a state for your OAuth authorization request.

Generate TOTP 2FA codes from a Base32 secret, build the otpauth:// URI and verify a 6- or 8-digit code.

Inspect a JWK or JWKS: kid, kty, alg, use, RFC 7638 thumbprint and a warning when private key material is exposed.

Convert Excel, CSV, or JSON into a copy-ready Markdown table.

Turn Excel, CSV, or JSON into semantic HTML table markup.

Generate SQL INSERT statements from Excel, CSV, or JSON.

Group a table by column and calculate count, sum, average, minimum, or maximum.

Swap rows and columns in an Excel, CSV, or JSON table.

Estimate mortar volume and bags for a brick or block wall.

Estimate bar counts, linear length, and weight for a reinforcement grid.

Estimate studs, plates, and timber length for a framed wall.

Calculate rafter length, count, and total timber for a simple gable roof.