Parenting Math,
Without the Panic

Free infant formula calculators and trackers built by Emily Hartwell, a registered dietitian and mom who has cried over an empty can at 2:47 AM — so you don't have to.

Explore All Tools Read Emily's Story
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12,400+ Parents Helped
6 Free Tools
48,000+ Calculations Done
4.9★ Average Rating

Most-Used Tools

The three tools parents open at 3 AM. No sign-up. No data leaves your device.

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Formula Calculator

Calculate daily formula intake based on your baby's weight and age. Includes preemie correction and feeding schedule.
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Feeding Log

Track every feed, ounce, and brand. View daily stats, weekly averages, and export for pediatrician visits.
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Mixing Guide

Get exact scoop-to-water ratios, temperature conversions, and safety warnings. No more "basically a scoop" disasters.

All Parenting Tools

Six free calculators and trackers. Every piece of data stays in your browser — we never see it, store it, or sell it.

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Formula Calculator

Estimate daily formula intake using weight and age. Supports preemie corrected age and outputs per-feed amounts.
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Feeding Log

Log every feed with time, amount, and brand. See today's total, weekly average, and longest gap between feeds.
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Mixing Guide

Exact scoop-to-water ratios for any amount. Temperature converter and common mistake checklist included.
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Allergy Tracker

Log symptoms, severity, and suspected formulas. Visual timeline helps spot patterns before your doctor visit.
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Growth Chart

Plot weight, height, and head circumference against WHO percentiles. Supports preemie corrected age.
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Cost Calculator

See weekly, monthly, and yearly formula costs. Compare brands and factor in bulk discounts.
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From the Feeding Diaries

Real stories, raw emotions, and the occasional 2 AM breakdown — from a dietitian mom who has been there.

Best Formula for Baby Constipation and Gas: What Worked

Best Formula for Baby Constipation and Gas: What Worked

A registered dietitian mom explains why some formulas cause constipation and gas, what actually helps, and when to switch without the guilt spiral.

August 15, 2026 ⏱ 6min read 🏷 General
Formula Amount Changes Weekly

Formula Amount Changes Weekly

Title: Why Your Baby's Formula Amount Changes Every Week (And How to Keep Up) Slug: formula-amount-changes-weekly Date: 2026-08-01 Domain: babyformula...

August 01, 2026 ⏱ 6min read 🏷 General
Formula Feeding Kit Car

Formula Feeding Kit Car

The Formula Feeding Kit I Keep in My Car at All Times Emily Hartwell I was standing in the parking lot of the Fred Meyer on Hawthorne, holding a screa...

July 29, 2026 ⏱ 6min read 🏷 General
Formula Shortage Still Real 2026

Formula Shortage Still Real 2026

"The formula shortage is over." I've heard this sentence at least a dozen times in the last month. From my mother-in-law. From a mom at the park. From...

July 25, 2026 ⏱ 6min read 🏷 General
The Day I Realized Formula Was Not The Enemy

The Day I Realized Formula Was Not The Enemy

The Day I Realized Formula Was Not the Enemy I was standing in the formula aisle at the Fred Meyer on Hawthorne, holding a can of hypoallergenic formu...

2026-07-13 ⏱ 6min read 🏷 General
European Formula Sister Smuggled Suitcase

European Formula Sister Smuggled Suitcase

My sister called me from Frankfurt airport, whispering like she was running a drug deal. "I got twelve boxes," she said. "They

2026-07-06 ⏱ 6min read 🏷 General
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