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Free Online Calculators

150+ free online calculators for health, finance, math, fitness, business and everyday use. Accurate, fast and works on any device.

✓ 150 Tools ⚡ Free 🔒 Private 🚫 No Login
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All Calculators

Showing all 150 tools

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BMI Calculator
Calculate your Body Mass Index from height and weight.
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Percentage Calculator
Calculate percentages, increases and decreases easily.
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Age Calculator
Calculate your exact age from a date of birth.
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Loan EMI Calculator
Calculate monthly EMI payments for loans.
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Tip Calculator
Calculate tips and easily split bills with friends.
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Scientific Calculator
Full-featured scientific calculator with advanced functions.
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Compound Interest Calculator
Calculate compound interest growth over time.
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Simple Interest Calculator
Calculate simple interest on loans and investments.
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Tax Calculator
Calculate income tax based on your earnings.
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Salary Calculator
Calculate hourly, monthly and annual salary amounts.
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Discount Calculator
Calculate discounted prices and savings amounts.
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Calorie Calculator
Calculate daily calorie needs based on lifestyle.
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Protein Calculator
Calculate daily protein intake requirements.
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Water Intake Calculator
Calculate daily water intake needs for your body.
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GPA Calculator
Calculate your GPA from course grades and credits.
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Grade Calculator
Calculate your final grade from assignments and exams.
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Fuel Cost Calculator
Calculate fuel costs for road trips and commutes.
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Electricity Cost Calculator
Calculate monthly electricity bills and usage costs.
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Mortgage Calculator
Calculate monthly mortgage payments and total cost.
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Investment Return Calculator
Calculate return on investment over time.
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Break Even Calculator
Calculate the break-even point for your business.
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Profit Margin Calculator
Calculate profit margin and markup percentages.
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VAT Calculator
Calculate VAT amounts for prices and invoices.
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Inflation Calculator
Calculate the effect of inflation on money over time.
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Retirement Calculator
Calculate retirement savings and projected corpus.
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BMR Calculator
Calculate your Basal Metabolic Rate for calorie needs.
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TDEE Calculator
Calculate your Total Daily Energy Expenditure.
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Body Fat Calculator
Estimate your body fat percentage from measurements.
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Ideal Weight Calculator
Calculate your ideal body weight for your height.
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Ovulation Calculator
Calculate ovulation dates and fertile windows.
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Due Date Calculator
Calculate pregnancy due date from conception date.
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Sleep Calculator
Calculate optimal sleep and wake up times.
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Running Pace Calculator
Calculate running pace, speed and finish times.
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Cycling Speed Calculator
Calculate cycling speed and distance metrics.
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Heart Rate Calculator
Calculate target heart rate zones for exercise.
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One Rep Max Calculator
Calculate your estimated one rep maximum for lifts.
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Macro Calculator
Calculate daily macro ratios for your fitness goals.
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Cholesterol Ratio Calculator
Calculate cholesterol ratio from blood test results.
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Blood Pressure Calculator
Interpret blood pressure readings and categories.
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Net Worth Calculator
Calculate your net worth from assets and liabilities.
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Savings Goal Calculator
Calculate how long to reach a savings target.
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Debt Payoff Calculator
Calculate debt payoff timelines and interest saved.
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APR Calculator
Calculate Annual Percentage Rate for loans.
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Currency Exchange Calculator
Calculate currency exchange with live rates.
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Gold Price Calculator
Calculate gold value by weight and purity.
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Cryptocurrency Calculator
Calculate cryptocurrency values and conversions.
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Stock Profit Calculator
Calculate profit and loss on stock trades.
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Dividend Calculator
Calculate dividend income from stock holdings.
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Options Profit Calculator
Calculate potential profit from options trades.
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Freelance Rate Calculator
Calculate hourly freelance rates from desired salary.
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Markup Calculator
Calculate selling price from cost and markup percentage.
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Return on Equity Calculator
Calculate return on equity for financial analysis.
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EBITDA Calculator
Calculate EBITDA from financial statement data.
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Pizza Size Calculator
Compare pizza sizes and find the best value deal.
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Paint Coverage Calculator
Calculate how much paint you need for a room.
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Wallpaper Calculator
Calculate how much wallpaper rolls you need.
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Tile Calculator
Calculate how many tiles needed for a floor or wall.
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Concrete Calculator
Calculate concrete volume for construction projects.
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Mulch Calculator
Calculate how much mulch needed for garden beds.
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Pool Volume Calculator
Calculate volume of a swimming pool.
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Time Duration Calculator
Calculate duration between two times or dates.
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Date Difference Calculator
Calculate the number of days between two dates.
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Countdown Timer
Create a countdown timer to any date or event.
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Stopwatch
Online stopwatch with lap timing functionality.
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Ratio Calculator
Calculate and simplify ratios between numbers.
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Proportion Calculator
Calculate proportions and solve proportion equations.
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Exponent Calculator
Calculate powers and exponents of numbers.
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Square Root Calculator
Calculate square roots and nth roots of numbers.
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Prime Number Checker
Check if a number is prime and find prime factors.
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LCM Calculator
Calculate the least common multiple of numbers.
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GCD Calculator
Calculate the greatest common divisor of numbers.
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Factorial Calculator
Calculate factorials of any positive integer.
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Fibonacci Calculator
Calculate Fibonacci sequence numbers and series.
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Triangle Calculator
Calculate triangle sides, angles and area.
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Circle Calculator
Calculate circle area, circumference and diameter.
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Rectangle Calculator
Calculate rectangle area, perimeter and diagonal.
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Volume Calculator
Calculate volume of common 3D shapes.
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Pythagorean Theorem Calculator
Calculate the missing side of a right triangle.
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Quadratic Formula Solver
Solve quadratic equations using the quadratic formula.
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Matrix Calculator
Perform matrix operations like addition and multiplication.
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Statistics Calculator
Calculate mean, median, mode and standard deviation.
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Probability Calculator
Calculate probability for events and distributions.
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Permutation Calculator
Calculate permutations and combinations.
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Log Calculator
Calculate logarithms in any base.
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Sin Cos Tan Calculator
Calculate trigonometric function values for any angle.
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Ohm Law Calculator
Calculate voltage, current and resistance using Ohm's Law.
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Resistor Color Code
Decode resistor color bands to find resistance values.
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LED Resistor Calculator
Calculate the correct resistor value for an LED circuit.
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Capacitor Calculator
Calculate capacitor charge, time and energy.
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Binary Addition Calculator
Add binary numbers and see the result.
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Bitwise Calculator
Perform bitwise AND, OR, XOR and shift operations.
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IP Subnet Calculator
Calculate IP subnets, masks and host ranges.
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VLSM Calculator
Calculate variable length subnet masks for networks.
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Bandwidth Calculator
Calculate network bandwidth and transfer time.
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Download Time Calculator
Calculate estimated download time for file sizes.
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Hash Rate Calculator
Calculate cryptocurrency mining hash rates.
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CO2 Footprint Calculator
Calculate your carbon footprint from daily activities.
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Solar Panel Calculator
Calculate solar panel requirements for energy needs.
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Wind Speed Calculator
Convert and calculate wind speed measurements.
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Earthquake Magnitude Calculator
Calculate and compare earthquake magnitudes.
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Dog Age Calculator
Convert dog years to human years and vice versa.
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Cat Age Calculator
Convert cat years to human years accurately.
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Gift Tax Calculator
Calculate potential gift tax on financial gifts.
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Estate Tax Calculator
Estimate estate tax liability for inheritance planning.
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Payroll Tax Calculator
Calculate payroll taxes for employees and employers.
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Self Employment Tax
Calculate self-employment tax for freelancers.
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Vehicle Depreciation
Calculate vehicle depreciation over time.
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Home Affordability Calculator
Calculate how much home you can afford to buy.
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Rent vs Buy Calculator
Compare the cost of renting versus buying a home.
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Moving Cost Calculator
Estimate the total cost of moving to a new home.
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Meal Cost Calculator
Calculate cost per serving for recipes and meals.
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Time Calculator
Add and subtract time durations easily.
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Time Card Calculator
Calculate work hours and overtime from time entries.
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Billable Hours Calculator
Calculate billable hours and invoice amounts.
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Project Cost Estimator
Estimate total project cost from hours and rates.
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Sprint Velocity Calculator
Calculate agile sprint velocity and capacity.
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Story Points Calculator
Convert story points to hours for sprint planning.
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Uptime Calculator
Calculate uptime percentage from downtime data.
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SLA Calculator
Calculate SLA compliance from response time data.
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Server Cost Calculator
Calculate cloud server and hosting costs.
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Loan Payoff Calculator
Calculate time to pay off a loan with extra payments.
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Amortization Schedule
Generate a full loan amortization schedule.
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Car Loan Calculator
Calculate monthly car loan payments and total cost.
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Student Loan Calculator
Calculate student loan repayments and interest.
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401k Calculator
Calculate 401k contribution growth over time.
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Roth IRA Calculator
Calculate Roth IRA growth and contribution limits.
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Bond Yield Calculator
Calculate bond yield to maturity and current yield.
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P/E Ratio Calculator
Calculate price-to-earnings ratio for stocks.
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EPS Calculator
Calculate earnings per share from financial data.
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CAGR Calculator
Calculate Compound Annual Growth Rate for investments.
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Payback Period Calculator
Calculate investment payback period.
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NPV Calculator
Calculate Net Present Value for investment analysis.
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IRR Calculator
Calculate Internal Rate of Return on investments.
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Cost Per Click Calculator
Calculate cost per click for advertising campaigns.
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Customer Lifetime Value
Calculate customer lifetime value for businesses.
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Churn Rate Calculator
Calculate customer churn rate for SaaS businesses.
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MRR Calculator
Calculate Monthly Recurring Revenue for subscriptions.
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ARR Calculator
Calculate Annual Recurring Revenue for SaaS.
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CAC Calculator
Calculate Customer Acquisition Cost for marketing.
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Burn Rate Calculator
Calculate startup cash burn rate and runway.
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Runway Calculator
Calculate how long your startup funding will last.
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Conversion Rate Calculator
Calculate website or funnel conversion rates.
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Email Open Rate Calculator
Calculate email campaign open and click rates.
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Bounce Rate Calculator
Calculate and interpret website bounce rates.
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NPS Score Calculator
Calculate Net Promoter Score from survey results.
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ROAS Calculator
Calculate Return on Ad Spend for campaigns.
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CPM Calculator
Calculate cost per thousand impressions for ads.
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CTR Calculator
Calculate click-through rate for ads and emails.
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Impression Share Calculator
Calculate ad impression share from campaign data.
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SEO Traffic Value Calculator
Calculate estimated value of organic SEO traffic.
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About Our Calculators

Calculations are a part of everyday life — from working out your BMI to planning a loan repayment to solving a quadratic equation. Helium Dock provides over 150 specialized calculators covering health, finance, mathematics, fitness, business and general use. Every calculator on Helium Dock is built for accuracy and ease of use. Results are displayed clearly with explanations where relevant. All calculations happen in your browser — no data is sent anywhere, and there is no account or payment required.

Frequently Asked Questions

How accurate are the calculators? ▾
Our calculators use standard formulas and are regularly verified for accuracy. For critical financial or medical decisions, always consult a qualified professional.
Can I use financial calculators for real money decisions? ▾
Our calculators provide useful estimates, but for significant financial decisions please consult a qualified financial advisor.
Are the health calculators medically approved? ▾
Health calculators use standard formulas (like NIH BMI guidelines) but are not a substitute for medical advice. Consult a healthcare professional for medical decisions.

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