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diff --git a/ao-tools/lib/ao-ms5607-convert.c b/ao-tools/lib/ao-ms5607-convert.c
new file mode 100644
index 00000000..cc0eee3b
--- /dev/null
+++ b/ao-tools/lib/ao-ms5607-convert.c
@@ -0,0 +1,63 @@
+/*
+ * Copyright © 2012 Keith Packard <keithp@keithp.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
+ */
+
+#include <ao-ms5607.h>
+
+void
+ao_ms5607_convert(struct ao_ms5607_sample *sample, struct ao_ms5607_value *value,
+		  struct ao_ms5607_prom *prom, bool is_ms5611)
+{
+	int32_t	dT;
+	int32_t TEMP;
+	int64_t OFF;
+	int64_t SENS;
+
+	dT = sample->temp - ((int32_t) prom->tref << 8);
+
+	TEMP = 2000 + (((int64_t) dT * prom->tempsens) >> 23);
+
+	if (is_ms5611) {
+		OFF = ((int64_t) prom->off << 16) + (((int64_t) prom->tco * dT) >> 7);
+		SENS = ((int64_t) prom->sens << 15) + (((int64_t) prom->tcs * dT) >> 8);
+	} else {
+		OFF = ((int64_t) prom->off << 17) + (((int64_t) prom->tco * dT) >> 6);
+		SENS = ((int64_t) prom->sens << 16) + (((int64_t) prom->tcs * dT) >> 7);
+	}
+
+	if (TEMP < 2000) {
+		int32_t	T2 = ((int64_t) dT * (int64_t) dT) >> 31;
+		int32_t TEMPM = TEMP - 2000;
+		int64_t OFF2 = (61 * (int64_t) TEMPM * (int64_t) TEMPM) >> 4;
+		int64_t SENS2 = 2 * (int64_t) TEMPM * (int64_t) TEMPM;
+		if (TEMP < -1500) {
+			int32_t TEMPP = TEMP + 1500;
+			/* You'd think this would need a 64-bit int, but
+			 * that would imply a temperature below -327.67°C...
+			 */
+			int32_t TEMPP2 = TEMPP * TEMPP;
+			OFF2 = OFF2 + (int64_t) 15 * TEMPP2;
+			SENS2 = SENS2 + (int64_t) 8 * TEMPP2;
+		}
+		TEMP -= T2;
+		OFF -= OFF2;
+		SENS -= SENS2;
+	}
+
+	value->pres = ((((int64_t) sample->pres * SENS) >> 21) - OFF) >> 15;
+	value->temp = TEMP;
+}