Free calculators, converters, and utilities
BMI, nutrition, Base64, GUIDs, random numbers, trading hours, display details. No sign-up. Everything runs locally in your browser.
Search tools
100 free tools · 3 categories · 100% private — runs in your browser
Browse all tools
100 tools, grouped by category.
Calculators
BMI and nutrition calculators
BMI Calculator
Calculate your Body Mass Index (BMI) based on height and weight
Nutrition Calculator
Calculate calories and macronutrients based on body composition and activity
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Mortgage Calculator Monthly mortgage payment with taxes, insurance, PMI and amortization
Loan Calculator
Monthly loan payment with total interest and amortization
Auto Loan Calculator
Monthly car payment with down payment, trade-in, tax and fees
Compound Interest Calculator
Future value of savings with compounding and contributions
Simple Interest Calculator
Interest and total with linear simple interest plus effective APR
Retirement / 401k Calculator Future 401k balance with employer match plus contributions-vs-growth split
Salary to Hourly / Paycheck Calculator Hourly rate from salary plus paycheck gross and take-home estimate
Income Tax Calculator (2025, Single Filer) 2025 federal tax estimate with bracket breakdown
Sales Tax / VAT Calculator Add/remove sales tax & VAT with receipt totals
Tip + Bill Split Calculator Tip calculator with bill splitting
Discount, Margin & Markup Calculator
Percent-off and margin/markup calculator
APR Calculator: Nominal, Effective & True APR
Nominal, effective & true APR calculator
Future Value Calculator: Growth, Present Value & Time to Goal
Future & present value calculator
Debt Payoff Calculator: Avalanche vs Snowball
Debt and credit-card payoff calculator
Savings & CD Calculator: APY Growth
Savings and CD growth calculator
Investment ROI & CAGR Calculator: Solve the Return
ROI, CAGR and holding-period return calculator
inflation_calculator.title
inflation_calculator.shortDescription
rent_vs_buy_calculator.title
rent_vs_buy_calculator.shortDescription
affordability_calculator.title
affordability_calculator.shortDescription
refinance_calculator.title
refinance_calculator.shortDescription
down_payment_calculator.title
down_payment_calculator.shortDescription
amortization_calculator.title
amortization_calculator.shortDescription
calorie_calculator.title
calorie_calculator.shortDescription
bmr_calculator.title
bmr_calculator.shortDescription
body_fat_calculator.title
body_fat_calculator.shortDescription
ideal_weight_calculator.title
ideal_weight_calculator.shortDescription
lean_body_mass_calculator.title
lean_body_mass_calculator.shortDescription
calories_burned_calculator.title
calories_burned_calculator.shortDescription
macro_calculator.title
macro_calculator.shortDescription
protein_calculator.title
protein_calculator.shortDescription
water_intake_calculator.title
water_intake_calculator.shortDescription
sleep_calculator.title
sleep_calculator.shortDescription
heart_rate_calculator.title
heart_rate_calculator.shortDescription
pace_calculator.title
pace_calculator.shortDescription
pregnancy_calculator.title
pregnancy_calculator.shortDescription
due_date_calculator.title
due_date_calculator.shortDescription
ovulation_calculator.title
ovulation_calculator.shortDescription
bac_calculator.title
bac_calculator.shortDescription
weight_loss_calculator.title
weight_loss_calculator.shortDescription
one_rep_max_calculator.title
one_rep_max_calculator.shortDescription
percentage_calculator.title
percentage_calculator.shortDescription
percent_change_calculator.title
percent_change_calculator.shortDescription
scientific_calculator.title
scientific_calculator.shortDescription
fraction_calculator.title
fraction_calculator.shortDescription
average_calculator.title
average_calculator.shortDescription
stddev_calculator.title
stddev_calculator.shortDescription
p_value_calculator.title
p_value_calculator.shortDescription
gpa_calculator.title
gpa_calculator.shortDescription
grade_calculator.title
grade_calculator.shortDescription
sci_notation_calculator.title
sci_notation_calculator.shortDescription
sigfig_calculator.title
sigfig_calculator.shortDescription
log_calculator.title
log_calculator.shortDescription
exponent_calculator.title
exponent_calculator.shortDescription
quadratic_calculator.title
quadratic_calculator.shortDescription
triangle_calculator.title
triangle_calculator.shortDescription
geometry_calculator.title
geometry_calculator.shortDescription
ratio_calculator.title
ratio_calculator.shortDescription
probability_calculator.title
probability_calculator.shortDescription
numbers_to_words.title
numbers_to_words.shortDescription
rounding_calculator.title
rounding_calculator.shortDescription
age_calculator.title
age_calculator.shortDescription
date_calculator.title
date_calculator.shortDescription
time_duration_calculator.title
time_duration_calculator.shortDescription
work_hours_calculator.title
work_hours_calculator.shortDescription
countdown_calculator.title
countdown_calculator.shortDescription
business_days_calculator.title
business_days_calculator.shortDescription
world_clock_calculator.title
world_clock_calculator.shortDescription
timer_calculator.title
timer_calculator.shortDescription
time_to_decimal.title
time_to_decimal.shortDescription
week_number_calculator.title
week_number_calculator.shortDescription
concrete_calculator.title
concrete_calculator.shortDescription
square_footage_calculator.title
square_footage_calculator.shortDescription
Converters
Base64 text encoding and decoding
Base64 Encoder
Encode plain text to Base64
Base64 Decoder
Decode Base64 to plain text
url_codec.title
url_codec.shortDescription
unit_converter.title
unit_converter.shortDescription
currency_converter.title
currency_converter.shortDescription
base_number_converter.title
base_number_converter.shortDescription
roman_numeral_converter.title
roman_numeral_converter.shortDescription
hash_generator.title
hash_generator.shortDescription
jwt_decoder.title
jwt_decoder.shortDescription
timestamp_converter.title
timestamp_converter.shortDescription
Utilities
GUIDs, random numbers, market hours, display details
GUID/UUID Generator
Generate UUIDs with format options
Random Number Generator
Random integers in a min–max range
Trading Hours
Open/closed status for major stock exchanges
Display Info
Screen resolution, viewport, DPR, and browser details.
LLM Hardware Calculator
Fit any LLM quant onto GPUs and Macs with tok/s estimates
password_generator.title
password_generator.shortDescription
qr_generator.title
qr_generator.shortDescription
json_formatter.title
json_formatter.shortDescription
word_counter.title
word_counter.shortDescription
case_converter.title
case_converter.shortDescription
lorem_ipsum_generator.title
lorem_ipsum_generator.shortDescription
color_picker.title
color_picker.shortDescription
gradient_generator.title
gradient_generator.shortDescription
dice_roller.title
dice_roller.shortDescription
coin_flip.title
coin_flip.shortDescription
subnet_calculator.title
subnet_calculator.shortDescription
No accounts. No tracking.
No sign-up. No tracking. Works on phone and desktop.
Private by design
Calculations run locally in your browser. Nothing is uploaded.
Fast and light
Static pages, no sign-up. Core tools work offline.
Mobile friendly
Responsive layout with dark mode.