🧮 Calculators
Free Online Calculators
Age, BMI, loan EMI, compound interest, GST, percentage, tip, currency, unit converter, scientific calculator and more — all free, instant, and 100% browser-based.
18Free Tools
0Server Uploads
100%Private & Free
All Calculators
Age Calculator
Calculate your exact age in years, months and days from your date of birth. Saves DOB automatically.
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BMI Calculator
Calculate Body Mass Index in metric or imperial units. See your BMI category (underweight, normal, overweight, obese).
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Percentage Calculator
Multi-mode: find X% of Y, find what % X is of Y, or calculate percentage change between two values.
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Loan EMI Calculator
Calculate monthly EMI, total interest paid and get a full amortisation schedule for any loan. Auto-saves inputs.
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Compound Interest Calculator
Calculate compound interest with yearly, quarterly or monthly compounding. See growth over time. Auto-saves.
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Simple Interest Calculator
Calculate simple interest and total repayment amount from principal, rate and time. Auto-saves inputs.
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GST Calculator
Add or remove GST for multiple tax slabs (5%, 12%, 18%, 28%). Shows base amount, GST and total. Auto-saves.
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Discount Calculator
Find the final price after a discount percentage. Reverse mode: find the discount % given original and sale price.
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Tip Calculator
Calculate tip amount and split the total bill among any number of people. Auto-saves last inputs.
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Currency Converter
Convert between 150+ currencies using live exchange rates. Fast, accurate and always up to date.
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Unit Converter
Convert length, weight, area, volume, speed and data storage. Remembers your last used unit pair.
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Temperature Converter
Instantly convert between Celsius, Fahrenheit and Kelvin with live conversion as you type.
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Scientific Calculator
Full scientific calculator with trigonometry, logarithms, powers, roots and memory functions. Auto-saves last expression.
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Date Difference Calculator
Find the number of days, months and years between two dates. Option to count business days only.
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Time Calculator
Add or subtract time durations. Convert between hours, minutes and seconds formats easily.
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Fuel Cost Calculator
Estimate trip fuel cost from distance, fuel efficiency (km/L or MPG) and fuel price per litre/gallon. Auto-saves.
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Calories Burned Calculator
Estimate calories burned by activity type, duration and body weight using MET values.
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Grade Calculator
Calculate GPA and letter grades from exam marks and scores. Add multiple subjects with custom weights.
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Why Use ToolZeel Calculators?
⚡ Fast & Private
- All calculations run entirely in your browser
- No data sent to any server — 100% private
- Instant results as you type — no loading
- Works offline once the page is loaded
- Auto-saves your inputs with localStorage
🧮 What You Can Calculate
- Your exact age in years, months and days
- Monthly loan EMI and full amortisation table
- GST breakdown for any tax slab
- Compound interest growth over years
- Convert units, temperatures and currencies
- Estimate trip fuel cost before you drive
- Calculate GPA and letter grades from marks