Are these calculators free?

Yes. Every calculator on Prompt Minds is free to use with no sign-up and no limits.

Is my data stored or shared?

No. All calculations run locally in your browser. Your loan, salary, health and personal figures are not sent to any server.

How accurate are the results?

The calculators use standard, well-documented formulas, so results match for the same inputs. Real figures can differ slightly because of fees, rounding, rule changes or individual factors, so treat results as estimates for planning.

Which calculator should I use for a home loan?

Use the EMI Calculator for Indian home loans, or the Loan Calculator for a full monthly schedule, CSV export and prepayment savings. For a US home purchase, the Mortgage Calculator adds property tax, insurance, PMI and HOA.

Do the calculators use the latest GST rates?

Yes. The GST Calculator has buttons for the GST 2.0 rates (3%, 5%, 18% and 40%) and a custom box for any other rate, including the old 12% and 28% slabs.

Which calculators are useful for students?

The Percentage, CGPA to Percentage, GPA, Average, Fraction and Scientific calculators all show step-by-step working, which is useful for checking homework and results.

Free Online Calculators — Finance, Health, Education & Everyday Maths

Loans, savings, tax, health, grades, dates, units and maths — accurate answers in seconds.

EMI, SIP, GST, BMI, उम्र, प्रतिशत, CGPA और यूनिट कन्वर्टर — सब free और turant।

61 free tools · No sign-up · Last Updated: October 2026

EMI CalculatorCalculate monthly EMI, total interest and total payment for home, car and personal loans, with an amortization view. SIP CalculatorEstimate the future value of a monthly SIP (mutual fund) investment. GST CalculatorCalculate GST at 3%, 5%, 18% or 40% (GST 2.0) or any custom rate — add or remove GST and see CGST, SGST and IGST. FD CalculatorCalculate fixed deposit maturity amount and interest. RD CalculatorCalculate recurring deposit maturity amount and interest. PPF CalculatorCalculate PPF (Public Provident Fund) maturity value over 15 years and beyond. Compound InterestCalculate compound interest with different compounding frequencies. Simple InterestCalculate simple interest and total amount. Crypto ProfitCalculate profit or loss on a cryptocurrency trade including fees. Income TaxEstimate Indian income tax under the new and old tax regimes. Inflation CalcEstimate the future cost of goods after inflation. Salary HikeCalculate a new salary after a percentage hike or increment. Age CalculatorExact age in years, months and days on any as-on date, with total months/weeks/days, next birthday, weekday of birth and an age-limit eligibility check. Percentage CalculatorSix percentage modes with steps: X% of Y, X is what % of Y, % change, marks %, add/subtract %, and finding the whole from a part. CGPA to PercentageCGPA ↔ percentage with presets (×9.5, ×10, VTU, GTU, Mumbai University) or a custom a × CGPA + b formula, with steps. GPA CalculatorCredit-weighted GPA on the US 4.0 scale or the Indian UGC 10-point scale (SGPA), with a cumulative GPA from previous GPA and credits. BMI CalculatorAdult BMI in kg/cm or lb/ft-in with WHO or Asian/Indian cut-offs, healthy weight range, gap to the healthy range and BMI Prime. Calorie CalculatorMifflin-St Jeor BMR, TDEE with five activity levels, ±250/500 kcal goal targets, a minimum-intake warning and sample macro splits. Loan CalculatorReducing-balance loan payment, total interest, monthly/yearly amortization table with CSV export, principal-vs-interest chart, and savings from extra monthly payments; 8 currencies. Mortgage CalculatorUS mortgage PITI: principal & interest, property tax %, insurance, PMI (auto-removed at 78% LTV) and HOA, with payoff date, total interest, chart and yearly schedule. Discount CalculatorSale price after one or two stacked discounts, a flat coupon and tax; savings and effective discount; reverse modes for discount % and original price. Tip CalculatorTip amount, total and per-person share with presets (10–25%) or custom %, optional pre-tax tipping, rounding and splitting among up to 100 people. Date Difference CalculatorDays between dates as years/months/days, total days, weeks, working days (Mon–Fri or Mon–Sat) and weekends; plus add/subtract years, months, weeks, days or working days. Time Zone ConverterConverts a date and time from one IANA time zone to up to 12 others with DST handled by the browser's time-zone database, plus a colour-coded 24-hour meeting planner. Unit ConverterEight categories (length, weight, temperature, area, volume, speed, time, data) with exact international factors, Indian units (tola, quintal, gaj), the formula and an all-units table. Scientific CalculatorExpression-based scientific calculator with its own safe parser: + − × ÷ ^, brackets, implicit multiplication, trig and inverse trig (DEG/RAD), log, ln, √, ∛, |x|, !, %, π, e, E notation, memory, Ans, live preview and history. Fraction CalculatorExact fraction arithmetic (+ − × ÷) with mixed numbers, LCD and GCD steps, simplest form, mixed number, decimal and percentage; plus simplify and decimal-to-fraction modes. Average CalculatorMean, median, mode(s), range, min/max, sum, population and sample standard deviation and variance, geometric and harmonic mean; weighted average with steps. Sales Tax CalculatorAdd tax to a price or remove it from a tax-inclusive total; US state base rates (2025) plus a local rate, standard VAT/GST for 14 countries, or a custom rate, with steps. Retirement & NPS CalculatorMonth-by-month corpus projection with annual step-up, user-set annuity share and rate for NPS-style lump sum and pension, inflation-adjusted values, yearly table; plus a corpus-needed planner with required SIP. EPF CalculatorMonth-by-month EPF projection: 12% employee (+ VPF), employer 12% minus EPS 8.33% on wages up to ₹15,000 (max ₹1,250), interest on monthly balances credited yearly at 8.25% (FY 2025-26), yearly salary hikes, existing balance, chart and table. Gratuity CalculatorGratuity = last basic+DA × 15/26 × years (part-year over 6 months counts as a year) for covered employers, 15/30 × completed years otherwise; eligibility 5 years (regular) or 1 year (fixed-term, Code on Social Security rules 2026); tax-free up to ₹20 lakh for private employees, fully exempt for government. HRA CalculatorHRA exemption = least of actual HRA, rent − 10% of (basic + DA), and 50% (8 listed cities from FY 2026-27, 4 metros before) or 40% of salary; yearly and monthly results, binding limit, landlord-PAN reminder; old regime only. NPS CalculatorMonthly NPS contributions with optional yearly increase, monthly compounding at an assumed return; at exit a minimum 20% annuity for All Citizen/corporate subscribers (full withdrawal if corpus ≤ ₹8 lakh) or 40% for government subscribers per PFRDA's December 2025 rules; pension = annuity × rate ÷ 12. Lumpsum CalculatorFuture value of a one-time investment with yearly compounding FV = P(1 + r)^n, returns, growth multiple, inflation-adjusted value, chart and year-by-year table. SWP CalculatorMonth-by-month systematic withdrawal plan simulation with optional yearly step-up: end balance, total withdrawn, returns earned, how long the money lasts and the safe level withdrawal for the period. CAGR CalculatorCompound annual growth rate CAGR = (end ÷ start)^(1/years) − 1, plus a reverse mode for future value, total growth, growth multiple and doubling time. Sukanya Samriddhi CalculatorSSY maturity: deposits for 15 years, yearly compounding until maturity 21 years after opening, with interest earned, maturity year and age, balance at age 18, chart and year-by-year table. Loan Prepayment CalculatorMonth-by-month reducing-balance amortisation with a one-time part-payment after any month and/or a fixed extra amount every month; compares keeping the EMI (shorter tenure) with keeping the tenure (lower EMI). Capital Gains Tax CalculatorIndian capital gains tax estimate for listed equity and equity funds, debt funds bought from April 2023, and property, gold or unlisted shares: holding period from dates, short- or long-term, ₹1.25 lakh equity exemption, rate and tax with 4% cess. Post Office MIS & SCSS CalculatorPost Office Monthly Income Scheme (7.4%, monthly payout, ₹9 lakh single / ₹15 lakh joint) and Senior Citizens Savings Scheme (8.2%, quarterly payout, ₹30 lakh) income: payout, yearly income, 5-year interest and deposit returned. Rupees in Words ConverterConverts rupee amounts to words in the Indian numbering system (thousand, lakh, crore) with paise, in English and Hindi, plus a cheque line "Rupees … Only", capital letters and an optional British-style "and". Pregnancy Due Date CalculatorEstimated due date by Naegele's rule (LMP + 280 days, adjusted for cycle length), conception date (+266 days) or IVF transfer (day-3 +263, day-5 +261); gestational age in weeks and days, trimester, days to go and a milestone table. Ovulation CalculatorCalendar-method ovulation estimate: ovulation = last period + cycle length − luteal phase (default 14 days), fertile window from 5 days before to 1 day after ovulation, most fertile days, next period and test date, for six cycles. BMR CalculatorBasal metabolic rate by Mifflin-St Jeor, revised Harris-Benedict and (with body fat %) Katch-McArdle, in metric or imperial units, plus maintenance calories (TDEE) for five activity levels. Body Fat CalculatorBody fat percentage by the US Navy circumference method (height, neck, waist and hips for women), ACE category, fat and lean mass, plus the BMI-based Deurenberg estimate, in metric or imperial units. Ideal Weight CalculatorHealthy weight range for height from BMI 18.5–24.9 (WHO) and 18.5–22.9 (Asian/Indian), ideal body weight by Devine, Robinson, Miller and Hamwi, current BMI and how much to lose or gain. Water Intake CalculatorDaily drinking-water estimate: 35 ml per kg body weight, plus 350 ml per 30 minutes of exercise, extra for hot climates and for pregnancy (+300 ml) or breastfeeding (+700 ml); in litres, glasses and an hourly schedule. Attendance CalculatorAttendance percentage, classes needed in a row to reach a required percentage (default 75%), classes that can be missed while staying above it, and term-end planning with classes left. Hours & Time CalculatorTwo modes: hours between two clock times minus an unpaid break (overnight shifts handled), as h:mm, decimal hours and minutes with optional hourly pay and a multi-day total; and adding or subtracting durations in h:mm:ss. Electricity Bill CalculatorTelescopic slab-tariff bill estimate from units, meter readings or an appliance list (watts × hours × days ÷ 1000), with editable slab rates, fixed charge and duty %, slab-wise breakdown and average cost per unit. Fuel Cost CalculatorTrip fuel cost = distance ÷ mileage × price per litre, with round trip, tolls, per-person split and cost per km, plus a monthly and yearly commute estimate. Marks Percentage CalculatorExam percentage across any number of subjects with different maximum marks: total obtained ÷ total maximum × 100, optional best-five selection, subject-wise percentages, highest/lowest subject and a common division label. Roman Numeral ConverterTwo-way Roman numeral conversion for 1–3,999 with standard subtractive pairs (IV, IX, XL, XC, CD, CM), strict validation of Roman input, step-by-step breakdown, quick examples and a symbols chart. CTC to In-hand Salary CalculatorCTC to in-hand salary calculator for India, FY 2026-27: splits CTC into basic (default 40%), employer PF (12% of basic or of the ₹15,000 wage ceiling, or none) and gratuity (4.81% of basic, optional); gross salary = CTC − employer PF − gratuity; new regime tax with ₹75,000 standard deduction, slabs 4/8/12/16/20/24 lakh, ₹60,000 rebate up to ₹12 lakh with marginal relief, surcharge with marginal relief and 4% cess; old regime with ₹50,000 standard deduction, professional tax, HRA exemption, 80C (incl. employee PF, max ₹1.5 lakh), 80D, 80CCD(1B) and age-based slabs; shows monthly and yearly breakdown and compares both regimes. Land Area Converter (Bigha, Gaj, Acre)Indian land area converter: fixed units — square feet, square metres, gaj/square yards (9 sq ft), acre (43,560 sq ft), hectare (107,639.104 sq ft), decimal/dismil/cent (435.6 sq ft), guntha (1,089 sq ft), marla (272.25 sq ft) and kanal (5,445 sq ft); state presets for bigha and its sub-unit — Bihar/Jharkhand 27,220 sq ft with katha 1,361; Uttar Pradesh 27,000 with biswa 1,350; Rajasthan pucca 27,225 and kachha 17,424; West Bengal 14,400 with katha 720; Assam 14,400 with katha 2,880; Punjab 9,070 — all editable with a custom option; converts any unit to all others; prominent warning to confirm local values. Height Converter (Feet to cm)Height converter: feet + inches → centimetres and centimetres → feet + inches (nearest 0.1 inch), plus metres, total inches and decimal feet; uses the exact definition 1 inch = 2.54 cm; includes a height chart from 4 ft 6 in to 7 ft 0 in with cm and metres; copy and share. Home Loan Eligibility CalculatorHome loan eligibility estimate: maximum EMI = (applicant + co-applicant net monthly income) × FOIR (40–60%) − existing EMIs; maximum loan = present value of that EMI at the chosen rate and tenure; tenure capped at 30 years and so the loan ends by age 60; property price and down payment from RBI loan-to-value limits (90% up to ₹30 lakh, 80% up to ₹75 lakh, 75% above); table of eligibility at three rates and four tenures; total interest. Speed Distance Time CalculatorSpeed–distance–time solver: speed = distance ÷ time, distance = speed × time, time = distance ÷ speed; distance in km, m, miles or nautical miles; speed in km/h, m/s, mph or knots; time as hours, minutes and seconds; shows every unit at once plus pace per km and per mile; exact unit factors (1 mile = 1,609.344 m, 1 nautical mile = 1,852 m). Rent Receipt GeneratorRent receipt generator for India: tenant and landlord names, landlord PAN (format checked), property address, monthly rent, from/to month, one receipt per month, quarter, half-year or year, payment mode (bank transfer, UPI, cheque, cash), receipt date at start or end of period; each receipt shows a number, date, amount in figures and in words (Indian system), period, landlord details and signature line; revenue-stamp box for cash receipts above ₹5,000; warns when annual rent exceeds ₹1 lakh without landlord PAN; prints only the receipts or saves as PDF via the browser; nothing is uploaded. GST Invoice GeneratorGST tax invoice generator: seller name, GSTIN (format and check digit validated, state auto-filled), state, address; buyer name, optional GSTIN, place of supply and address; invoice number (up to 16 characters), date, reverse charge; line items with description, HSN/SAC, quantity, unit, rate and GST rate (0, 0.25, 3, 5, 18 or 40% or custom); CGST + SGST when seller state equals place of supply, otherwise IGST; optional round-off; grand total in words; bank details and terms; prints only the invoice or saves as PDF; draft saved in this browser only. Does not generate e-invoice IRN or QR.

Free Online Calculators — Finance, Health, Education & Everyday Maths

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