Letter & Mail Tools for Kids
Free, practical calculators for the numbers behind sending real mail — postage and stamp counts, envelope sizing, delivery times, pen-pal time zones, and letter reading time. Educational tools for families and classrooms, not official postal quotes.
Postage Calculator
Estimate the postage on a letter, card, or small package from its weight, mail class, and destination — a quick, kid-friendly way to work out what a stamp run will cost
Mail Delivery Time Estimator
Guess how many days a letter will take from how far it's travelling and the service you choose — so a young pen pal knows roughly when to expect a reply
Envelope & Paper Size Matcher
Choose your paper size and fold and we name the envelope that fits, with a simple fold guide, so a child's letter goes in cleanly the first time
Pen-Pal Time-Zone Helper
Compare two cities' time zones to see the hours apart and the shared window when both children are awake — the best time to write, call, or send voice notes
Letter Word Count & Reading Time
Paste a letter or enter a word count to see how long it takes to read at early-reader, grade-school, teen, and adult speeds — and whether its length suits a younger reader
Stamp Quantity Calculator
Enter a letter's weight and the stamp you have, and see how many stamps to stick on to cover the postage, with the leftover value, so a child can mail with confidence