All Calculators

Enter tank dimensions to get water volume (gal/L), water weight, substrate displacement and floor load (PSF). Supports rectangular, cylinder and bowfront tanks.

Calculate how many fence posts you need, actual spacing, hole depth (with frost line) and concrete bags per hole. For 4x4 and 6x6 posts.

How much rainwater can your roof collect? Enter roof area and rainfall to get gallons per storm, month or year, plus a recommended tank size.

Strip-based wallpaper estimator: enter wall dimensions, roll size and pattern repeat to get exact rolls. Handles US and European roll sizes, doors and windows.

Estimate debris volume and weight by project type (cleanout, remodel, roofing, concrete) and get the right dumpster size — 10 to 40 yards, with weight-limit warnings.

Enter your target weight and bar type; get the exact plates per side, plus warm-up ramp sets. lb and kg, custom plate inventory.

Calculate DIM weight for your package, compare billable weight across all four carriers, and see which one charges least. 2026 divisors.

Scale any bread formula: enter flour or total dough weight plus hydration, salt, yeast and starter percentages. Starter flour/water correctly accounted.

Convert any cake pan to another by volume: round, square, sheet and loaf pans. Get the scaling ratio plus bake time and temperature adjustments.

Calculate Body Mass Index and assess health status

Calculate calories, BMR, TDEE and nutrition ratio recommendations

Calculate body fat percentage using multiple methods and health analysis

Calculate body surface area for medical dosing and standardization

Calculate child blood type probability based on parents' blood types

Estimate recommended daily salt and sodium intake from health guidelines. Free online calculator for diet planning.

Calculate serum anion gap to assist in diagnosing acid-base balance and metabolic disorders

Calculate pregnancy dates based on last menstrual period, gestational age, conception date, or due date

Calculate monthly payments, total interest, repayment schedule and other loan-related information

Calculate investment returns and compound growth simulation

Plan retirement savings and investment goals

Quick restaurant tip calculation

Quickly calculate sales tax on purchases of goods or services

Easily calculate discounts and final prices

Enter price and size — instantly see cost per unit (oz, lb, kg, liter) and which option is cheaper. Free comparison tool.

Calculate the interval between two dates or deduce future or past dates

Calculate the interval between two times or deduce future or past times

Calculate exact age, birthday countdown, etc.

Calculate semester and cumulative GPA with support for multiple grading systems

Train visual scanning, focus, and attention speed with an interactive Schulte grid.

Bidirectional conversion between text and Morse code with audio playback

Various percentage-related calculations

Calculate arithmetic, geometric, harmonic, quadratic means with statistical analysis

Add, subtract, multiply and simplify fractions online. Convert to decimals instantly — free fraction calculator.

Find square roots, cube roots and nth roots with adjustable precision. Instant free calculator — no signup.

Check if a number is prime and factorize into prime factors

Calculate greatest common divisor and least common multiple of two or more numbers

Generate random numbers within specified range

Basic function calculations and graph plotting

Calculate LED circuit power requirements and efficiency analysis

Estimate energy usage based on brightness and pixel pitch

Calculate voltage distribution and power consumption in LED circuits, analyze circuit efficiency

Calculate current-limiting resistor value and required power

Compare energy consumption and costs of LED vs. traditional lighting

Estimate LED project costs and recommended quote

Calculate pixel size, count and dimensions for LED screens — enter width & height to get total pixels and resolution instantly.

Estimate LED pixel pitch from viewing distance, content detail, and indoor or outdoor use. Compare practical pitch ranges for LED walls, signage, and video displays.

Calculate LED screen resolution from physical dimensions and pixel pitch. Plan content, media players, and video processors for LED walls and displays.

Calculate module count and actual screen dimensions

Estimate how many LED power supplies are needed based on total load, derating, and project headroom. Supports single-phase and three-phase planning.

Estimate LED cabinet rows, columns, active and spare cabinet count, and actual assembled screen size for procurement and installation planning.

Calculate optimal viewing distance for LED screens

Calculate load requirements and safety factor for LED screens

Assess surge current risks in LED circuits

Calculate shipping volume and weight for LED equipment

Convert between strings and Base64 encoding

Calculate MD5, SHA series hash values for strings

Encode and decode URL components, query strings, and full URLs locally in the browser

Decode JSON Web Token headers and payloads locally without uploading token values

Format, minify, and validate JSON locally in the browser without uploading data

Convert between binary, octal, decimal, and hexadecimal

Convert between strings and hexadecimal

Unix timestamp and date time conversion

Subnet mask and IP range calculation

Look up HTTP status code meanings and usage scenarios

Storage space allocation calculation, helping you plan disk partitioning and formatting schemes

Parse and explain Unix 5-field cron expressions with human-readable summaries and error detection

Estimate whether your GPU or Mac can run Llama, Qwen and other local LLMs. Check VRAM by model size and quantization — free online calculator.

Calculate surveillance storage from camera count, resolution, codec, hours per day and retention days. Get total TB, recommended drive size and bandwidth.

Calculate optimal planting density and row spacing based on crop characteristics and requirements

Calculate precise NPK fertilizer application rates based on soil tests and crop requirements

Calculate dilution and concentration for pesticides, nutrients and other agricultural solutions

Calculate seeding rate per acre based on seed specifications and planting requirements

Calculate dry matter in hay, silage and mixed feeds for ration planning. Free livestock nutrition calculator.

Statistical analysis of livestock fertility rates, conception rates and breeding indicators

Agricultural production cost accounting and profitability analysis

Estimate harvest output from field area, yield rate and expected losses. Free farm yield calculator for planning and quotes.

Convert a 41% glyphosate label rate into product per tank, acres per tank and tanks needed, with every substitution shown step by step.