Calculators

How it works: BMI = weight ÷ height². Classifies results into underweight (<18.5), normal (18.5–24.9), overweight (25–29.9), or obese (30+). Metric (kg/cm) and imperial (lb/in) supported.
Example: A person weighing 68 kg at 172 cm has a BMI of 23.0 — normal weight category.

How it works: BMR = 10×weight + 6.25×height − 5×age + 5 (male) or −161 (female). This is the energy your body needs at complete rest before any activity.
Example: A 28-year-old male, 68 kg, 172 cm has a BMR of ~1,606 kcal/day.

How it works: US Navy circumference method. Male: measures neck & waist. Female: neck, waist & hip. The formula uses logarithmic ratios against height.
Example: A male with 38 cm neck, 85 cm waist, 172 cm height has ~17.2% body fat.

How it works: BMR × activity multiplier. Levels: sedentary (×1.2), light (×1.375), moderate (×1.55), active (×1.725), very active (×1.9). Gives your total daily energy expenditure.
Example: A 28-year-old male, 68 kg, 172 cm, moderately active needs ~2,488 kcal/day.

How it works: Uses the Devine formula. For every inch above 5 feet: add 2.3 kg to a base of 50 kg (male) or 45.5 kg (female). Population-average, not a personal target.
Example: A male at 172 cm (5'8") has a reference weight of ~68.4 kg (±5 kg).

How it works: Adds 280 days (40 weeks) to the first day of your LMP — the standard Naegele's rule. Also shows how many weeks along you are today.
Example: LMP of 2026-01-15 → estimated due date of 2026-10-22, ~25 weeks along today.

How it works: Pick a mode: X% of Y (e.g., what's a discount?), X is what % of Y (e.g., test scores), or % change from X to Y (e.g., price change). Enter two numbers.
Example: 20% of ₹250 = ₹50. A price change from ₹400 → ₹500 = 25% increase.

How it works: Enter the bill amount, pick a tip percentage (or custom), and optionally split by number of people. Shows tip amount, total bill, and per-person share.
Example: A ₹84.50 bill, 15% tip, split 2 ways = ₹48.59 per person.

How it works: Final price = original price × (1 − discount%/100). Shows both how much you save and the discounted price.
Example: Original price of ₹1,999 at 30% off → you save ₹600 and pay ₹1,399.

How it works: EMI = P × r(1+r)^n / ((1+r)^n − 1) where P=principal, r=monthly interest rate, n=months. Shows total interest and total repayment.
Example: Loan of ₹5,00,000 at 9.5% over 5 years → EMI of ~₹10,499, total interest ~₹1,29,940.

How it works: Loan amount = home price − down payment. Then the same EMI formula applies. Shows principal borrowed, total interest, and monthly payment.
Example: Home of ₹45,00,000, down payment ₹9,00,000, at 8.5% over 20 years → EMI ~₹31,232.

How it works: Loan amount = vehicle price − down payment. Uses the same EMI formula, calculated in months rather than years.
Example: Car worth ₹12,00,000, down ₹2,00,000, at 10% for 48 months → EMI ~₹25,363.

How it works: Future value = P × ((1+r)^n − 1)/r × (1+r). This accounts for each monthly investment compounding at the expected return rate.
Example: ₹5,000/month at 12% for 10 years → invested ₹6,00,000 grows to ~₹11,61,695.

How it works: A = P(1 + r/n)^(n×t). The interest earns interest each compounding period. Choose from annual to daily compounding.
Example: ₹1,00,000 at 7%, compounded quarterly for 10 years → grows to ~₹2,00,966.

How it works: SI = P × R × T / 100. Unlike compound interest, only the original principal earns interest each year.
Example: ₹1,00,000 at 6% for 3 years → interest ₹18,000, total payable ₹1,18,000.

How it works: Applies the new regime tax slabs: 0% up to ₹3L, 5% (3-7L), 10% (7-10L), 15% (10-12L), 20% (12-15L), 30% above. Illustrative only.
Example: Annual income of ₹12,00,000 → estimated tax ₹65,000, effective rate 5.4%.

How it works: Add GST: final = base × (1 + rate%). Remove GST: base = final / (1 + rate%). Preset rates: 5%, 12%, 18%, 28%.
Example: Base ₹1,000 + 18% GST = ₹1,180 final. Or ₹1,180 incl. GST = ₹1,000 base + ₹180 GST.

How it works: Starts from annual CTC, deducts employer PF, then deducts employee PF and professional tax. Basic pay % and PF rate are configurable.
Example: CTC ₹9,00,000 with 40% basic, 12% PF → take-home ~₹57,022/month.

How it works: Grows your current savings as a lump sum plus monthly contributions as a SIP, both compounding at your expected return rate.
Example: Age 30, retire at 60, ₹2L saved + ₹10K/month at 10% → corpus ~₹3,19,00,000.

How it works: Margin = (sell − cost) / sell × 100. Markup = (sell − cost) / cost × 100. Both are shown for clarity.
Example: Cost ₹400, sold at ₹600 → profit ₹200, margin 33.3%, markup 50%.

How it works: BEP = fixed costs / (price per unit − variable cost per unit). This is how many units cover your costs — everything above is profit.
Example: Fixed costs of ₹50,000, price ₹250/unit, variable cost ₹100/unit → need to sell 334 units to break even.

How it works: Units (kWh) = wattage × hours/day × days/month ÷ 1000. Cost = units × rate per kWh.
Example: A 1,500W appliance running 4 hrs/day for 30 days at ₹8/kWh → 180 kWh, cost ₹1,440/month.

How it works: Fuel needed = distance ÷ mileage. Cost = fuel needed × price per litre.
Example: 350 km trip at 15 km/l with fuel at ₹100/l → needs 23.3 litres, costs ~₹2,333.

How it works: Weighted average: sum(grade point × credits) ÷ total credits. Add subjects one by one, each with a grade point (0–10) and credit hours.
Example: Math (9 pt × 4 credits) + Physics (8 pt × 3 credits) = weighted GPA of 8.57.

How it works: Percentage = marks obtained ÷ total marks × 100. Letter grade: A+ (≥90%), A (≥80%), B (≥70%), C (≥60%), D (≥50%), F (<50%).
Example: 78 out of 100 → 78.0% → Grade B.

How it works: Subtracts two dates and breaks down the difference into years, months, days, total days, and weeks. Works in both directions (absolute difference).
Example: 2024-01-15 to 2026-07-10 → 907 days, or 2y 5m 25d.

How it works: Uses the browser's built-in Intl API to convert any datetime between 22 major time zones. Handles DST automatically.
Example: 10:00 AM in Asia/Kolkata → 12:30 AM in America/New_York.

How it works: speed = distance / time. Choose which one to solve for, enter the other two. Results in km/h, km, and hours.
Example: 120 km in 2 hours → speed is 60 km/h.

How it works: Concrete: volume (m³) = L×W×D, then estimates cement bags. Paint: litres = area ÷ coverage per litre.
Example: Slab 5m × 4m × 0.15m → 3 m³ of concrete, ~19 bags of cement.